RKI GX-3R Pro Owner's Manual

PT0-165
GX-3R Pro (TIIS Version)
Operator’s Manual
Part Number: 71-0642
Revision: P1
Released: 10/16/23
RKI Instruments, Inc.
www.rkiinstruments.com
WARNING
Read and understand this instruction manual before operating
instrument. Improper use of the gas monitor could result in bodily
harm or death.
Maintenance of the gas monitor is essential for proper operation and
correct readings.
Bump test the instrument before each day’s use with a known
concentration of each target gas. A bump test can be done in User
Mode’s BUMP TEST item or by applying gas in Measuring Mode.
The instrument does not need to be calibrated unless it does not pass
the User Mode bump test or does not respond appropriately, as
defined by the user, in Measuring Mode.
2 • GX-3R Pro (TIIS Version) Operator’s Manual
GX-3R Pro Quick Reference Guide
Turn On
Press & Hold
POWER
MODE
GX-3R Pro Quick Reference Guide
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&RQ¿UPDWLRQ
Gas name
reading
Time
Buzzer
Volume
+HDOWK&KHFN
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Bluetooth
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,QGLFDWRU
Past Due Bump/CAL
To Bump / CAL
POWER
MODE
&RQ¿UP 8VH
AIR
POWER
MODE
AIR
GX-3R Pro
Normal
Operation
CO/H22SS LEL
2 2 TOXIC
CO/H
LEL OO
CO2
After brief
warm-up period
Alarm LED
Audible Alarm
Port
Sensors
Fresh Air
Press & Hold
AIR
Scan QR code for
GX-3R Pro Manual
Turn Off
Press & Hold
POWER
MODE
RKI Instruments, Inc. 33248 Central Ave, Union City, CA 94587
3KRQH ‡ ‡ZZZUNLLQVWUXPHQWVFRP
190523/1000
Statement of Quality and Conformance
RKI Instruments, Inc. certifies that this instrument has been tested, inspected, and
calibrated by a qualified technician and was found to meet or exceed the
manufacturer's specifications per ISO 9001 Quality System.
Register your Product here:
www.rkiinstruments.com/registration
RKI Instruments, Inc. • 33248 Central Avenue, Union City, CA 94587
Phone: (510) 441-5656 • (800) 754-5165 • Fax: (510) 441-5650
www.rkiinstruments.com
GX-3R Pro (TIIS Version) Operator’s Manual • 3
Table of Contents
Chapter 1: Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
About the GX-3R Pro . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
About this Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Chapter 2: Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Instrument Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
LCD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Control Buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Alarm LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Buzzer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Vibrator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Infrared Communications Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Battery Pack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Included Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Belt Clip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Alligator Clip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Rubber Boot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Wrist Strap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Single-Unit AC Charger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Calibration Cup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Other Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
12 VDC Charger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Multi-Unit AC Charger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
SDM-3R . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4 • GX-3R Pro (TIIS Version) Operator’s Manual
RP-3R . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Aspirator Adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
IrDA Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Chapter 3: Measuring Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Turning On the GX-3R Pro . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Performing a Demand Zero . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Turning Off the GX-3R Pro . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Measuring Mode Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Monitoring an Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Combustible Gas Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Oxygen-Enriched Atmospheres. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
H2-Compensated CO Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Interference Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
CO2 Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Aspirator Adapter Sampling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Alarm Indications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Responding to Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Data Logging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Chapter 4: Display Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Tips for Using Display Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Peak Screen (PEAK). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
STEL Screen (STEL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
TWA Screen (TWA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Combustible Sensor Target Gas Conversion (HC GAS LIST). . . . . . . . . . . . . . . . . . . . . . . . 50
User ID Screen (USER ID). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Station ID Screen (STATION ID). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Last Successful Calibration Date (CAL DATA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Last Successful Bump Test Date (BUMP DATA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Date, Time, and Temperature Screen (DATE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
GX-3R Pro (TIIS Version) Operator’s Manual • 5
Alarm Points Screen (ALARM POINTS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Screen Inversion On/Off (INVERT SELECT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
LCD Color Scheme (LCD BACKGROUND) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Turning Bluetooth On/Off (BLUETOOTH). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Adjusting the Buzzer Volume (BUZZER VOLUME) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Changing Instrument Language Back to English (LANGUAGE) . . . . . . . . . . . . . . . . . . . . . 60
Chapter 5: User Mode and Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Entering User Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Tips for Using User Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Performing a Bump Test (BUMP TEST) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Performing a Calibration (GAS CAL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Setting Calibration Parameters (CAL SETTING) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Setting Bump Test Parameters (BUMP SETTING) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Adjusting Man Down and Panic Settings (MAN DOWN). . . . . . . . . . . . . . . . . . . . . . . . . . . 99
Alarm Settings (ALARM SETTING). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Updating the Lunch Break Setting (LUNCH BREAK) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
Setting the Confirmation Beep and Non-Compliance Indicator (CONFIRMATION). . . . . 105
Auto Backlight in Low Light (AUTO BACKLIGHT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
Updating the Backlight Time (BACKLIGHT TIME). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
Turning the Key Tone On/Off (KEY TONE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
Display Mode Items (D MODE SETTING). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
Reading Units for IR Sensor (IR UNIT SELECT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
CO2 Fresh Air Adjustment On/Off (CO2 AIR SETTING) . . . . . . . . . . . . . . . . . . . . . . . . . 111
Setting the Date/Time (DATE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
Setting the Date Format (DATE FORMAT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
Changing the Instrument Language (LANGUAGE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
Turning the Password On/Off (USER PASSWORD). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
Viewing the ROM/SUM (ROM/SUM). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
Viewing the Radio Standards (RADIO STANDARD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
Returning to Measuring Mode (START MEASURE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116
6 • GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 6: Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
Instrument Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
Replacing the Batteries (Alkaline Version). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
Recharging the Batteries (Li-ion Version) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
Replacing the Buzzer Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
Replacing the Sensor Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
Replacing the Hydrophobic Dust Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
Replacing a Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
Replacing the Battery Board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
Chapter 7: Storage and Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134
Chapter 8: General Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
Appendix A: RK Link Phone App . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
Installing the App . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
Important Setup Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
Pairing a GX-3R Pro. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
Searching for a Paired GX-3R Pro . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142
Disconnecting a Paired GX-3R Pro . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143
Adjusting App Notification Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144
Defining Owner Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146
Setting Up Email/Text Alerts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148
Changing GX-3R Pro Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158
Alarm Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160
Calibration and Bump Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161
Backlight Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163
Logger Data Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164
Viewing Serial Number, IDs, and Bump/Cal Information . . . . . . . . . . . . . . . . . . . . . . . . . . 165
Viewing App Version Info . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168
Appendix B: Maintenance Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170
Entering Maintenance Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 172
GX-3R Pro (TIIS Version) Operator’s Manual • 7
Tips for Using Maintenance Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173
Performing a Calibration (GAS CAL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174
Performing a Gas Test (GAS TEST). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174
Sensor/Battery Replacement Date (SENSOR DATE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 176
Performing a Bump Test (BUMP TEST) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177
Setting Alarms to Latching or Self-Resetting (LATCHING) . . . . . . . . . . . . . . . . . . . . . . . . 178
Turning Demand Zero On/Off (DEMAND ZERO) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178
Turning Auto Zero On/Off (AUTO ZERO) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 179
Turning ID Display Function On/Off (ID DISPLAY) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 179
Turning Zero Suppression On/Off (ZERO SUPPRESS) . . . . . . . . . . . . . . . . . . . . . . . . . . . 180
Turning Zero Follower On/Off (ZERO FOLLOWER) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180
User Mode Zero Suppression (DISP ZERO SUP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180
User Mode Zero Follower (DISP ZERO FLWR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180
Setting the Date/Time (DATE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181
Setting the Date Format (DATE FORMAT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181
Setting the Instrument Language (LANGUAGE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182
Turning the Password On/Off (MAINT PASSWORD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182
Viewing the ROM/SUM (ROM/SUM). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183
Adjusting the LCD’s Contrast (LCD CONTRAST). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 184
Performing a Default (M.DEFAULT). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185
Exiting Maintenance Mode (START MEASURE). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186
Appendix C: Gas Select Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187
Entering Gas Select Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187
Tips for Using Gas Select Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 188
Changing the Gas Combination (GAS COMBO). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 189
Saving the Alarm Points (SAVE ALARM-P) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 192
Turning the Calibration Max Span On/Off (DISP MAX SPAN) . . . . . . . . . . . . . . . . . . . . . 193
Stealth and Vibrator Settings (STEALTH) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194
LEL Definition (CHANGE LEL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194
Exiting Gas Select Mode (START MEASURE). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196
8 • GX-3R Pro (TIIS Version) Operator’s Manual
Appendix D: Interference Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 197
ESR-A13D-HCN, HCN Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 197
ESR-A13D-NO2, NO2 Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 198
ESR-A13D-PH3, PH3 Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200
ESR-A13D-SO2, SO2 Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201
ESR-A13i-H2S, H2S Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203
ESR-A13P-CO, CO Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205
ESR-A1CP-COH, H2-Compensated CO Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207
ESR-A1DP-COHS, CO Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209
ESR-A1DP-COHS, H2S Detection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 211
ESR-B134-NH3, NH3 Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 213
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214
WARNING: Understand manual before operating. Substitution of components may impair
intrinsic safety. To prevent ignition of a hazardous atmosphere, batteries must
only be changed or charged in an area known to be nonhazardous.
GX-3R Pro (TIIS Version) Operator’s Manual • 9
Chapter 1: Introduction
Overview
This chapter briefly describes the GX-3R Pro gas monitor. This chapter also describes the
GX-3R Pro Operator’s Manual (this document). Table 1 at the end of this chapter lists the
specifications for the GX-3R Pro.
About the GX-3R Pro
Using an advanced detection system consisting of up to four gas sensors, the GX-3R Pro personal
five-gas monitor detects the presence of combustible gas, oxygen (O2), carbon monoxide (CO),
hydrogen sulfide (H2S), and CO2 or a super toxic gas simultaneously. This model displays
measurement results on an LCD and issue gas alarms (via LED and buzzer) as needed. This
model also wirelessly transmits measurement results to a host using Bluetooth. The GX-3R Pro’s
compact size and easy-to-use design make it ideally suited for a wide range of applications,
including sewage treatment plants, utility manholes, tunnels, hazardous waste sites, power
stations, petrochemical refineries, mines, paper mills, drilling rigs, and fire fighting stations. The
GX-3R Pro offers a full range of features, including:
• Simultaneous monitoring of one to five gases
• Liquid crystal display (LCD) for complete and understandable information at a glance
• Ultrabright alarm LEDs
• Distinctive audible/vibrating alarms for dangerous gas conditions and audible alarms for
unit malfunction
• Microprocessor control for reliability, ease of use, and advanced capabilities
•
•
•
•
•
•
•
Data logging functions
Alarm trend data
STEL, TWA, and over range alarms
Peak readings
Built-in time function
Lunch break feature
TIIS classified as intrinsically safe (see Table 1 on page 11)
WARNING: The Model GX-3R Pro detects oxygen deficiency, elevated levels of oxygen,
combustible gases, carbon monoxide, and hydrogen sulfide, all of which can be
dangerous or life threatening. When using the GX-3R Pro, you must follow the
instructions and warnings in this manual to assure proper and safe operation of
the unit and to minimize the risk of personal injury. Be sure to maintain and
periodically calibrate the GX-3R Pro as described in this manual.
10 • Chapter 1: Introduction
GX-3R Pro (TIIS Version) Operator’s Manual
Specifications
Table 1: Standard Sensor Specifications
Combustible Gas,
Methane (CH4)
Calibration Standard*
Oxygen (O2)
Hydrogen
Sulfide (H2S)
Carbon
Monoxide (CO)
Detection Range
0 - 100% LEL
0 - 40.0% volume
0 - 200.0 ppm
0 - 2000 ppm
Lower Detectable
Limit (LDL)
n/a
n/a
0.5 ppm
3 ppm
Reading
Increment
1% LEL
0.1% volume
0.1 ppm
1 ppm
Warning
Setpoint
10% LEL
19.5% volume,
decreasing
5.0 ppm
25 ppm
Alarm
Setpoint
25% LEL
18.0% volume,
decreasing
30.0 ppm
50 ppm
Alarm H
Setpoint
50% LEL
23.5% volume,
increasing
100.0 ppm
1200 ppm
STEL Setpoint
n/a
n/a
5.0 ppm
200 ppm
TWA Setpoint
n/a
n/a
1.0 ppm
25 ppm
*
The GX-3R Pro is also available set up for general hydrocarbons and calibrated to a combustible gas other than
methane, such as isobutane. Consult RKI Instruments, Inc. for further information.
Table 2: IR Sensor Specifications
Carbon Dioxide (CO2)
Detection Range
0 - 10.00% volume
0 - 10,000 ppm
Lower Detectable
Limit (LDL)
0.05% volume
300 ppm
Reading
Increment
0.01% volume
20 ppm
Warning
Setpoint
0.50% volume
5,000 ppm
Alarm
Setpoint
3.00% volume
5,000 ppm
Alarm H
Setpoint
3.00% volume
5,000 ppm
STEL Setpoint
3.00% volume
n/a
TWA Setpoint
0.50% volume
5,000 ppm
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 1: Introduction • 11
Table 3: EC Sensor Specifications
Ammonia
(NH3)
Hydrogen
Cyanide
(HCN)
Nitrogen
Dioxide
(NO2)
Phosphine
(PH3)
Sulfur
Dioxide (SO2)
Detection Range
and Service Range
0 - 400.0 ppm
(parts per million)
0 - 30.0 ppm
(parts per million)
0 - 20.00 ppm
(parts per million)
0 - 20.00 ppm
(parts per million)
0 - 100.00 ppm
(parts per million)
Lower Detectable
Limit (LDL)
4 ppm
1.0 ppm
0.30 ppm
0.02 ppm
0.20 ppm
Reading
Increment
0.5 ppm
0.1 ppm
0.05 ppm
0.01 ppm
0.05 ppm
Warning
Setpoint
25 ppm
5.0 ppm
2.00 ppm
0.30 ppm
2.00 ppm
Alarm
Setpoint
35 ppm
10.0 ppm
4.00 ppm
0.60 ppm
5.00 ppm
Alarm H
Setpoint
300 ppm
30.0 ppm
20.00 ppm
0.60 ppm
100.00 ppm
STEL Setpoint
35 ppm
10.0 ppm
1.00 ppm
1.00 ppm
5.00 ppm
TWA Setpoint
25 ppm
4.7 ppm
0.50 ppm
0.30 ppm
2.00 ppm
Table 4: GX-3R Pro Specifications
Sampling
Method
Diffusion (the model does not have internal suction pumps)
Response Time
T90 within 30 seconds
Display
Graphics LCD Display
Max. Distance
for Bluetooth
Connection
30 feet, unobstructed
• 3000 meter maximum altitude
Environmental
Conditions
• Operating pressure: 70 - 120 kPa (70 - 110 kPa for explosion proof)
• Pollution degree 2
• IP 66/68
12 • Chapter 1: Introduction
GX-3R Pro (TIIS Version) Operator’s Manual
Table 4: GX-3R Pro Specifications
Operating
Temperature
& Humidity
Continuous environment: -20°C to 50°C/Below 90% RH
Temporary environment (up to 15 minutes): -40°C to 60°C/Below 95% RH
Ambient temperature range (for charging): 0°C to 40°C
NOTE: The H2-compensated CO sensor may not effectively compensate for high levels of
H2 if exposed to temperatures above 40°C for longer than 15 minutes. Under these
conditions, it can appear to the instrument that the H2 concentration has exceeded 2000
ppm, the max concentration that can be compensated for, resulting in a CO reading higher
than the actual CO level.
Safety/
Regulatory
• TIIS: IIC T4 Ga
List of
Standards
• JNIOSH-TR-46-1: 2015
Power Supply
• JNIOSH-TR-46-6: 2015
Alkaline battery pack with 2 AAA batteries (3.0 VDC, 250 mA)
OR
Lithium ion battery pack (3.7 VDC, 200 mA)
• Maxell rechargeable battery model no. ICP463048XS
NOTE: The GX-3R Pro draws power from an integrated rechargeable Li-ion battery that
is not user-replaceable.
Continuous
Operating
Hours
@ 25 °C in
Measuring
Mode
(Non-Alarm
Operation)
Lithium Ion
Battery Pack
• Standard 4 gas + super-toxic EC: 25 hours (23 hours with Bluetooth on)
• Super-toxic EC only: 50 hours
• Standard 4 gas + IR: 16 hours (15 hours with Bluetooth on)
• IR only: 24 hours
Alkaline
Battery Pack
• Standard 4 gas + super-toxic EC: 16 hours (14 hours with Bluetooth on)
• Super-toxic EC only: 32 hours
• Standard 4 gas + IR: 7 hours (6 hours with Bluetooth on)
• IR only: 12 hours
Battery
Charger
Ratings
Input: 100 - 240 VAC, 47 - 63 Hz, 2.4 A
Output: 5.99 VDC, 2A max
WARNING: Do not charge the unit with a non-genuine charger.
High-impact Plastic, RF Shielded, Dust and Weather Proof (IP66/68)
Case
WARNING: The enclosures shall be protected against exposure to hydraulic liquids, oil
or grease.
• Belt clip
• Alligator clip
Included
Accessories
• Rubber boot
• Wrist strap
• Calibration cup
• Single-unit charger (included with Li-ion versions only)
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 1: Introduction • 13
Table 4: GX-3R Pro Specifications
• 12 VDC charger
• Multi-unit charger
Other
Accessories
• SDM-3R
• RP-3R
• Aspirator adapter
• IrDA/USB Cable for connecting to a computer when using the Data Logger Management
Program (not needed if computer has an infrared port)
Dimensions
and Weight
Lithium Ion Battery Pack Version
Approximately 65(H) x 73(W) x 26(D) mm (2.6”H x 2.9”W x 1.0”D)
Approximately 120 g (4.2 oz.)
Alkaline Battery Pack Version
Approximately 65(H) x 73(W) x 34(D) mm (2.6”H x 2.9”W x 1.3”D)
Approximately 140 g (4.9 oz.)
Instrument
No.
Serial Number
Key
00
0
000
0000
00
A
B
C
D
E
• A: Year of manufacture (0 to 9)
• B: Month of manufacture (1 to 9 for Jan.-Sep.; XYZ for Oct., Nov., Dec.)
• C: Manufacturing lot
• D: Serial number
• E: Factory codes
About this Manual
The GX-3R Pro Operator’s Manual uses the following conventions for notes, cautions, and
warnings.
NOTE: Describes additional or critical information.
CAUTION: Describes potential damage to equipment.
WARNING: Describes potential danger that can result in injury or death.
14 • Chapter 1: Introduction
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 2: Description
Overview
This chapter describes the GX-3R Pro instrument and its accessories.
Instrument Description
Alarm
LEDs
LCD
Threaded
Inserts
Charging
Socket
POWER
MODE
AIR
GX-3R Pro
CO/H2S
LEL
O2 TOXIC
Buzzer
Opening
Sensor
Retainer
Front
Bottom
Cover
Back
Figure 1: Component Location
Case
The GX-3R Pro’s sturdy, high-impact plastic case is radio frequency (RF) resistant and is suitable
for use in many environmental conditions, indoors and out. The case is dust proof and water
resistant. A clear plastic window on the front of the case allows for LCD viewing. The black
bottom cover, located on the bottom of the case, allows access to the filters and sensors. A sensor
retainer and filter gasket help orient and retain the sensor and filters.
Three threaded inserts on the back of the case allow for installation of an alligator clip or belt clip.
LCD
A digital LCD (liquid crystal display) is visible through a clear plastic window in the top case.
The LCD simultaneously shows the gas reading for all installed sensors. The LCD also shows
information for each of the GX-3R Pro’s operating modes.
WARNING: A thin protective film covers the display to prevent scratches during shipping.
Remove this film before use. Leaving the film installed voids the intrinsically safe
certification.
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 2: Description • 15
Control Buttons
Two control buttons, AIR and POWER MODE are located below the LCD.
Button
Function(s)
AIR
• turns on LCD backlight
• resets alarm condition if LATCHING is set to ON in Maintenance
Mode
• enters User Mode, Maintenance Mode, and Gas Select Mode when
used with POWER MODE button
• activates the demand zero function (adjusts the GX-3R Pro’s fresh air
reading)
• changes the value of a parameter available for adjustment
• scrolls through parameter options
POWER MODE
• turns the GX-3R Pro on and off
• turns on LCD backlight
• enters and scrolls through Display Mode
• enters instructions into the GX-3R Pro’s microprocessor
• resets alarm condition if LATCHING is set to ON in Maintenance
Mode
• enters User Mode, Maintenance Mode, and Gas Select Mode when
used with AIR button
Alarm LEDs
Five sets of red alarm LEDs (light emitting diodes) around the edge of the case alert you to gas,
low battery, and failure alarms.
Buzzer
One solid-state electronic buzzer is located inside the case. Sound exits the case through a hole in
the middle front of the case. The buzzer sounds for gas alarms, malfunctions, low battery voltage,
and as an indicator during use of the GX-3R Pro’s many display and adjustment options.
Vibrator
A vibrating motor inside the GX-3R Pro case vibrates for gas alarms, unit malfunctions, and as an
indicator during normal use of the various modes of the GX-3R Pro.
NOTE: If STEALTH is set to ON, the vibrator only functions when VIBRATION in the
STEALTH Gas Select Mode item is set to ON. See “Stealth and Vibrator Settings
(STEALTH)” on page 193.
16 • Chapter 2: Description
GX-3R Pro (TIIS Version) Operator’s Manual
Sensors
The GX-3R Pro uses four sensors to monitor up to 5 gases simultaneously. The sensor retainer
and bottom cover hold the sensors in place. The sensors use different detection methods, as
described below.
Combustible Gas Sensor
The combustible gas sensor (NCR-6309) detects combustible gas in the % LEL range using 2
catalytic elements: a standard element and a poison-resistant element that is resistant to sensor
poisons like silicone. The element’s resistance changes based on the reaction of gas with oxygen.
The change in resistance affects the current flowing through the element. The GX-3R Pro’s
circuitry amplifies the current, converts the current to a gas concentration, and displays the
concentration on the LCD.
The standard calibration for the combustible gas sensor is to methane but the sensor will still
detect and respond to a variety of combustible gases.
O2/CO/H2S/Super Toxic Sensors
The O2, CO, H2S, and super toxic sensors are electrochemical cells that consist of two precious
metal electrodes in a dilute acid electrolyte. A gas permeable membrane covers the sensor face
and allows gas to diffuse into the electrolyte. The gas reacts in the sensor and produces a current
proportional to the concentration of the target gas. The GX-3R Pro’s circuitry amplifies the
current, converts the current to a gas concentration, and displays the concentration on the LCD.
There are 4 different types of CO and H2S sensors available:
• CO only (ESR-A13P-CO): A single electrochemical cell that detects CO.
• H2 compensated CO (ESR-A1CP-CO-H): A single electrochemical cell that detects CO.
This sensor does not respond to or responds minimally to hydrogen (displays H2 RICH
once H2 concentration reaches 2000 ppm).
NOTE: The H2-compensated CO sensor may not effectively compensate for high
levels of H2 if exposed to temperatures above 40°C for longer than 15
minutes. Under these conditions, it can appear to the instrument that the H2
concentration has exceeded 2000 ppm, the max concentration that can be
compensated for, resulting in a CO reading higher than the actual CO level.
• H2S only (ESR-A13i-H2S): A single electrochemical cell that detects H2S.
• CO/H2S (ESR-A1DR-COHS): A combination electrochemical cell that detects both CO
and H2S.
IR Sensors
The infrared sensors detect CO2 in the ppm and % volume ranges. Gas enters the sensor through
an opening on its face. Infrared light shines through the gas and into an infrared detector. The
intensity of the infrared light changes with the gas concentration and this change is converted to
an electrical signal. The GX-3R Pro’s circuitry converts the signal into a gas concentration and
displays the gas concentration on the LCD.
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 2: Description • 17
Dummy Sensors
A dummy sensor is installed in any units that have less than 4 sensors. Dummy sensors are factory
installed. The flat side of the dummy sensor faces away from the GX-3R Pro and the hollow side
faces toward the GX-3R Pro.
Filters
Combustible Gas Sensor H2S Removal Filter Disk (Dark Red)
An H2S removal filter disk is placed into a recess in the filter gasket over the combustible gas
sensor. The filter disk prolongs the life of the combustible gas sensor by preventing H2S in the
ambient air from reaching the sensor. The H2S filter disk is dark red in color and although it may
darken over time, its color is not indicative of remaining filter life.
The H2S filter disk needs replacing once it’s been exposed to 33 ppm hours of H2S. This means
the filter needs replacing after 80 minutes of exposure to 25 ppm H2S which equates to 40 2minute calibrations with a cylinder containing 25 ppm H2S. If H2S exists in the monitoring
environment, the H2S filter disk will have to be replaced more frequently.
CO/H2S Sensor Dual Filter (Black and White)
A dual filter is placed into a recess in the filter gasket over the dual CO/H2S sensor. The black half
is a charcoal filter for the CO sensor. The white half is a humidity filter for the H2S sensor.
Replace the filter if you notice:
• Unexplained CO readings.
• For users with a 1 ppm H2S alarm setpoint: A drift on the H2S zero reading, unexplained
H2S readings, the filter appears dirty, or every 6 months (whichever is sooner).
CO Sensor Charcoal Filter (Black)
A black charcoal filter is placed into a recess in the filter gasket over the CO sensor. The charcoal
filter disk scrubs H2S and certain hydrocarbons out of the sample to avoid false CO readings. If
false or elevated CO readings are noticed, especially in the presence of H2S, change the charcoal
filter.
H2S and PH3 Sensors’ Humidity Filter (White)
A white humidity filter is placed into a recess in the filter gasket over the H2S or PH3 sensor (if an
H2S or PH3 sensor is installed). The filter absorbs humidity in the sampling environment to
prevent unstable readings around 0 ppm. “H2S” and “PH3” are printed on the side of the filter.
• H2S: For users with a 1 ppm H2S alarm setpoint, the filter should be replaced every 6
months, if you notice a drift on the zero reading, or if the filter appears dirty (whichever is
sooner). For users with a 2 ppm or higher H2S alarm setpoint, the filter does not
necessarily ever need to be replaced.
• PH3: The filter should be replaced every 6 months.
18 • Chapter 2: Description
GX-3R Pro (TIIS Version) Operator’s Manual
NO2 and SO2 Sensors’ H2S Removal Filter Disk (Tan)
An H2S removal filter disk is placed into a recess in the filter gasket over the NO2 or SO2 sensor
(if an NO2 or SO2 sensor is installed). The filter disk prolongs the life of the sensors by preventing
H2S in the ambient air from reaching the sensor. The filter should be replaced every 6 months.
"NO2" is printed on the side of the filter intended for use with NO2 sensors. "SO2" is printed on
the side of the filter intended for use with SO2 sensors.
HCN Sensor’s H2S Removal Filter Disk (Dark Gray)
An H2S removal filter disk is placed into a recess in the filter gasket over the HCN sensor (if an
HCN sensor is installed). The filter disk prolongs the life of the sensors by preventing H2S in the
ambient air from reaching the sensor. The filter should be replaced every 6 months.
NH3 Sensor’s Humidity Filter (White)
A white humidity filter is placed into a recess in the filter gasket over the NH3 sensor (if an NH3
sensor is installed). The filter absorbs humidity in the sampling environment to prevent unstable
readings around 0 ppm. The filter should be replaced every 6 months. “NH3” is printed on the
side of the filter.
Hydrophobic Dust Filter
The oval-shaped hydrophobic dust filter is attached to the top of the filter gasket, covering the
sensor ports and the filters. The filter gasket and hydrophobic dust filter get replaced as a set.
NOTE: Some GX-3R Pros have a hydrophobic dust filter that is not attached to the filter gasket.
When replacing the hydrophobic dust filter on one of these GX-3R Pros, remove the
filter and the gasket and replace it with a filter gasket/hydrophobic dust filter assembly.
Infrared Communications Port
An infrared (IR) communications port is located on the top of the case, near the top LEDs.
Logged data transmits through the port in standard IrDA protocol. A computer’s infrared port or
an IrDA/USB cable connected to a USB port can be used to download data to the GX-3R Data
Logger Management Program. See the GX-3R Data Logger Management Program operator’s
manual for data logging and downloading instructions.
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 2: Description • 19
Battery Pack
The GX-3R Pro is either powered by a rechargeable lithium-ion (Li-ion) battery pack or an
alkaline battery pack with 2 AAA batteries (Toshiba LR03), both of which have integral
components for maintaining intrinsic safety. Instruments with a Li-ion battery pack have a
charging socket on the back of the instrument. Instruments with an alkaline battery pack have a
cover that allows for battery replacement.
The battery icon in the upper right of the LCD shows remaining battery life. A low battery
warning activates when the GX-3R Pro detects a low battery voltage. The GX-3R Pro sounds a
dead battery alarm when battery voltage is too low for Measuring Mode.
NOTE: Use of batteries or battery chargers not specified by RKI Instruments, Inc. will
compromise the TIIS classification and may void the warranty. See page 118 and page
120 for more information.
WARNING: Do not charge batteries in a hazardous location. Do not charge the unit with a
non-genuine charger.
Included Accessories
Belt Clip
A belt clip is already installed on the back of the GX-3R Pro to easily attach the instrument to a
utility belt.
Belt Clip
Figure 2: Belt Clip
20 • Chapter 2: Description
GX-3R Pro (TIIS Version) Operator’s Manual
Alligator Clip
An alligator clip and three installation screws are included but not pre-installed on the GX-3R
Pro. The alligator clip can be used to attach the GX-3R Pro to clothing or a belt. Teeth in the
alligator clip’s jaws prevent the unit from slipping off. The alligator clip can be rotated to change
the instrument’s orientation.
Figure 3: Alligator Clip
Rubber Boot
A black rubber boot is installed on the GX-3R Pro.
Wrist Strap
A wrist strap is included with the GX-3R Pro and can be attached to the wrist strap installation
feature on the left side of the GX-3R Pro’s case.
Single-Unit AC Charger
The charging cable is a 4 foot cable with an AC adapter on one end and a charging plug that
connects to the GX-3R Pro on the other end.
Charging
Plug
AC Adapter
Figure 4: Charging Cable
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 2: Description • 21
Calibration Cup
Use the calibration cup to apply gas during a bump test, calibration, or gas test. The calibration
cup has an installation orientation to observe. “Front” and “rear” imprinting on the bottom of the
cup correspond to the front and rear of the GX-3R Pro when the calibration cup is installed. In
addition, a “front” label on the front of the calibration cup should be visible when viewing the
LCD with the calibration cup installed.
FRONT
Figure 5: Calibration Cup
Other Accessories
12 VDC Charger
The 12 VDC charger is a 4 foot cable with a vehicle plug on one end and a plug that connects to
the GX-3R’s power jack on the other end.
Multi-Unit Charger
The multi-unit charger is a 4 foot wall plug style adapter that plugs into a bar. The bar has five 2foot cables coming out one side. The end of each of the five cables has a plug that connects to the
GX-3R Pro’s power jack. The AC adapter is rated 100 - 240 VAC input, 5.99 VDC output.
SDM-3R
The SDM-3R is a calibration station for the GX-3R and GX-3R Pro. The station’s buttons can be
used for operations (Standalone Mode) or a computer can be used to control the docking station
(PC Controlled Mode). See the appropriate SDM-3R manual for more information.
22 • Chapter 2: Description
GX-3R Pro (TIIS Version) Operator’s Manual
RP-3R
The RP-3R is a pump that draws sample to the GX-3R Pro. See the RP-3R manual for more
information.
Aspirator Adapter
The aspirator adapter is a squeeze-bulb assembly that draws sample to the GX-3R Pro.
IrDA Cable
Unless your computer has a built-in IrDA port, an IrDA cable is needed to establish
communication between the GX-3R Pro and the Datalogging Program.
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 2: Description • 23
Chapter 3: Operation
Overview
This chapter explains how to perform confined space entry monitoring or general area monitoring
in the GX-3R Pro’s Measuring Mode.
Start Up
This section explains how to start up the GX-3R Pro, get it ready for operation, and turn it off.
WARNING: A thin protective film covers the display to prevent scratches during shipping.
Remove this film before use. Leaving the film installed voids the intrinsically safe
certification.
NOTE: The screens illustrated in this section are for a 4-gas + 0 - 10.00% volume CO2 unit. The
screens displayed by your GX-3R Pro may be slightly different.
Turning On the GX-3R Pro
To illustrate certain functions, the following description of the GX-3R Pro start up sequence
assumes that the following menu items are turned on: LUNCH BREAK, CAL REMINDER,
and BUMP REMINDER in User Mode, and ID DISPLAY and AUTO ZERO in Maintenance
Mode. If any of these items are turned off, then the corresponding screens will not appear.
1. Press and briefly hold down POWER MODE. Confirm that the LCD turns on, the LEDs flash,
the buzzer sounds, and the motor vibrates before continuing with operation. Release the
POWER MODE button when you hear a beep.
2. If LUNCH BREAK is set to ON (factory setting is OFF, see page 105), the Lunch Break
Screen appears. The unit counts down from 5 seconds.
7:49
5 SEC
NO :AIR
LUNCH BREAK
7:49
5 SEC
YES :MODE
LUNCH BREAK
a. Continue Accumulating: To continue accumulating peak and time-weighted average
(TWA) readings from the last time the GX-3R Pro was used, press and release POWER
MODE or allow the countdown to reach 0. The short-term exposure limit (STEL) reading
is reset each time the GX-3R Pro is turned on.
b. Reset Accumulation: To reset the accumulation of peak and time-weighted average
(TWA) readings, press and release AIR before the countdown reaches 0.
24 • Chapter 3: Operation
GX-3R Pro (TIIS Version) Operator’s Manual
3. If CAL REMINDER is set to ON (factory setting) and a calibration is due, the screen that
appears next depends on how CAL EXPIRED is set in User Mode (see page 91). The three
possible screens are described below. If a calibration is not due, the instrument displays the
number of days left until a calibration is due.
CAL EXPIRED set to
CONFIRM TO USE (factory setting)
CAL EXPIRED set to
CANNOT USE
CAL EXPIRED set to
NO EFFECT
LCD
7:49
7:49
7:49
CONFIRM TO USE
USER MODE:MODE
NO :AIR
CAL DATE PAST
CANNOT USE
USER MODE:MODE
NO EFFECT
USER MODE:MODE
CAL DATE PAST
CAL DATE PAST
Sound
Buzzer sounds double pulsing tone
Buzzer sounds double pulsing tone
None
Action
• Option A, Perform calibration:
Press and release POWER MODE
to perform a calibration. The
instrument takes you straight to the
AUTO CAL CYLINDER A screen
in User Mode’s GAS CAL\AUTO
CAL item. If Password Protection
is set to On using the SDM-3R PC
program, you must enter a
password. See page 75 for
calibration instructions.
The GX-3R Pro cannot be used until
a successful calibration is performed. Press and release POWER
MODE to perform a calibration. The
instrument takes you straight to the
AUTO CAL CYLINDER A screen
in User Mode’s GAS CAL\AUTO
CAL item. If Password Protection
is set to On using the SDM-3R PC
program, you must enter a password. If you don’t press POWER
MODE, the instrument automatically goes to the AUTO CAL CYLINDER A screen after 6 seconds. If
Password Protection is set to On
using the SDM-3R PC program, you
must enter a password. See page 75
for calibration instructions.
• Option A, Perform calibration: To
perform a calibration, press and
release POWER MODE. The
instrument takes you straight to the
AUTO CAL CYLINDER A screen
in User Mode’s GAS CAL\AUTO
CAL item. If Password Protection
is set to On using the SDM-3R PC
program, you must enter a
password.
If the calibration is successful, the
screen above will not appear again
until the unit is due for calibration.
If the calibration is not successful,
the screen above will again appear
in the startup sequence.
• Option B, Bypass message: To
continue without performing a
calibration, press and release AIR.
• Option B, Bypass message: To
continue without performing a
calibration, wait a few seconds for
the instrument to continue with its
startup sequence.
If the calibration is successful, the
screen above will not appear again
until the unit is due for calibration.
If the calibration is not successful,
the screen above will again appear
in the startup sequence.
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 3: Operation • 25
4. If BUMP REMINDER is set to ON (factory setting is OFF) and a bump test is due, the
screen that appears next depends on how BUMP EXPIRED is set in User Mode (see page
97). The three possible screens are described below. If a bump test is not due, the instrument
displays the number of days left until a bump test is due.
BUMP EXPIRED set to
CONFIRM TO USE (factory setting)
BUMP EXPIRED set to
CANNOT USE
BUMP EXPIRED set to
NO EFFECT
7:49
7:49
LCD
7:49
CONFIRM TO USE
USER MODE:MODE
NO :AIR
BUMP DATE PAST
CANNOT USE
USER MODE:MODE
NO EFFECT
USER MODE:MODE
BUMP DATE PAST
BUMP DATE PAST
Sound
Buzzer sounds double pulsing tone
Buzzer sounds double pulsing tone
None
Action
• Option A, Perform bump test:
Press and release POWER MODE
to perform a bump test. The
instrument takes you straight to the
BUMP TEST CYLINDER A
screen in the BUMP TEST User
Mode item. If Password
Protection is set to On using the
SDM-3R PC program, you must
enter a password. See page 68 for
bump test instructions.
The GX-3R Pro cannot be used until
a successful bump test is performed.
Press and release POWER MODE to
perform a bump test. The instrument
takes you straight to the BUMP
TEST CYLINDER A screen in the
BUMP TEST User Mode item. If
Password Protection is set to On
using the SDM-3R PC program, you
must enter a password. If you don’t
press POWER MODE, the instrument automatically goes to the
BUMP TEST CYLINDER A screen
after 6 seconds. If Password Protection is set to On using the SDM-3R
PC program, you must enter a password. See page 68 for bump test
instructions.
If the bump test is successful, the
screen above will not appear again
until the unit is due for bump testing.
If the bump test is not successful, the
screen above will again appear in the
startup sequence.
• Option A, Perform bump test: To
perform a bump test, press and
release POWER MODE. The
instrument takes you straight to the
BUMP TEST CYLINDER A
screen in the BUMP TEST User
Mode item. If Password
Protection is set to On using the
SDM-3R PC program, you must
enter a password.
If the bump test is successful, the
screen above will not appear again
until the unit is due for bump
testing. If the bump test is not
successful, the screen above will
again appear in the startup
sequence.
• Option B, Bypass message: To
continue without performing a
bump test, press and release AIR.
26 • Chapter 3: Operation
• Option B, Bypass message: To
continue without performing a
bump test, wait a few seconds for
the instrument to continue with its
startup sequence.
GX-3R Pro (TIIS Version) Operator’s Manual
5. The Date/Time Screen appears for a few seconds.
7:49
MM/DD/YYYY
1/14/2019
7:49
DATE
6. The Battery Voltage Screen appears for a few seconds. The battery voltage is on the top line.
The alarm latching/self-resetting setting is on the second line (see page 178 for a description
of how to change this setting). The battery pack type is on the bottom line.
7:49
3.7V
LATCHING
Li-ion
7. The combustible gas sensor actually contains 2 separate sensors: a standard catalytic sensor
and a backup, poison-resistant sensor that is resistant to sensor poisons like silicone. An HC
Gas List alarm indicates that the standard sensor has a reduced output, possibly due to one or
more sensor poisons in the environment, and that the poison-resistant sensor is being used to
provide gas readings. The poison-resistant sensor has a limited list of detectable gases. The
table shown on page 48 shows which gases can and cannot be detected after receiving an HC
Gas List alarm.
If your application requires detection of a gas still detectable after an HC Gas List
condition (like methane or isobutane), there is no need to replace the combustible gas
sensor.
However, if your application requires detection of a gas not detectable after an HC Gas List
condition (like methanol or ethanol), you must replace the combustible gas sensor as soon
as possible.
Press and release POWER MODE to confirm the limited gas list and continue to
Measuring Mode.
7:49
READ GAS
LIST IN
MANUAL
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 3: Operation • 27
8. The following screens display for 3 seconds each: the Gas Name Screen, the Full Scale
Screen, the Warning Setpoint Screen, the Alarm Setpoint Screen, the Alarm H Setpoint
Screen, the STEL Alarm Screen, and the TWA Alarm Screen.
NOTE: If the combustible gas is set to something other than CH4 or H2 in Gas
Select Mode, the combustible channel is displayed as “HC” and the gas
formula for the combustible gas sensor’s target gas appears during startup.
7:49
CH4
O2
%LEL
CH4
O2
CO
%
ppm
CO
H2S
vol%
3.00
%LEL
CO
ppm
H2S
ppm
CO2
%
CO2
vol%
3.00
ALARM H
vol%
40.0
10.00
FULL SCALE
7:49
CO
ppm
200
H2S
CO2
%LEL
10
O2
%
CO
ppm
25
3.00
H2S
CO2
19.5
STEL
ppm
5.0
vol%
0.50
WARNING
ppm
5.0
vol%
7:49
CH4
ppm
50 1200 100.0
23.5
H2S
100 2000 200.0
%
30.0
7:49
CH4
7:49
O2
ppm
vol%
O2
ppm
50
H2S
CO2
CO2
CO
ppm
ALARM
H2S
GAS NAME
%LEL
%
ppm
CO2
O2
CH4
25
CO
18.0
7:49
CH4
%LEL
7:49
CO
ppm
25
CO2
H2S
ppm
1.0
vol%
0.50
TWA
28 • Chapter 3: Operation
GX-3R Pro (TIIS Version) Operator’s Manual
9. If ID DISPLAY is set to ON (factory setting is OFF, see page 179), the User ID Screen
appears for a few seconds, followed by the Station ID Screen.
7:49
7:49
USER_ID_
001
STATION_
ID_001
USER ID
STATION ID
10. If the GX-3R Pro experiences a sensor failure during start up, the display shows which sensor
failed and the buzzer sounds a double pulsing tone once per second. In the example below, the
combustible gas sensor failed.
7:49
CH4
%LEL
FAIL
FAIL SENSOR
Press and release POWER MODE to acknowledge the failure and continue. “- - - -”
replaces the failed sensor’s gas reading. Replace the failed sensor as soon as possible.
11. If AUTOZERO is set to ON (factory setting is OFF, see page 179), the instrument prompts
you to do an auto zero.
7:49
YES : MODE
NO : AIR
AUTO ZERO
WARNING: Make sure that the instrument is in a known fresh air environment (an
environment free of combustible or toxic gases and of normal oxygen
content, 20.9%) before performing an auto zero operation. If you perform an
auto zero operation in an area with gases present, the adjustment will not be
accurate.
a. An auto zero operation sets the combustible gas, H2S, CO, and super toxic channels to 0
and the OXY channel to 20.9%.
b. If the instrument has a CO2 sensor installed and if CO2AIR SETTING is set to ON in
User Mode, the CO2 channel gets set to 400 ppm (0.04% volume) during an auto zero. If
CO2AIR SETTING is set to OFF in User Mode, the CO2 channel is not adjusted during
the auto zero.
c. You must press and release POWER MODE to perform an auto zero function. If you do
not press any key, after 15 seconds, the instrument enters Measuring Mode without
performing an auto zero.
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 3: Operation • 29
d. If Password Protection is turned On (factory setting is Off) using the SDM-3R PC
program, a user-set password is required to perform an auto zero. When the password
screen appears, adjust each digit with the AIR button and press and release the POWER
MODE button to move on to the next digit. Once the password is entered, the instrument
performs the auto zero.
7:49
0000
PASSWORD
12. At the end of the 45 second warmup, the GX-3R Pro begins monitoring for gas in Measuring
Mode. The Measuring Mode Screen displays the current gas reading for each target gas.
7:49
CH4
%LEL
O2
%
0
CO
20.9
ppm
0
CO2
H2S
ppm
0.0
vol%
0.00
Performing a Demand Zero
Perform a demand zero before using the GX-3R Pro. A demand zero operation sets the
combustible gas, H2S, CO, and super toxic channels to zero and the OXY channel to 20.9%.
If the instrument has a CO2 sensor installed and if CO2AIR SETTING is set to ON in User
Mode, the CO2 channel gets set to 400 ppm (0.04% volume). If CO2AIR SETTING is set to
OFF in User Mode, the CO2 channel is not adjusted during the demand zero.
1. Find a fresh-air environment. This is an environment free of toxic or combustible gases and of
normal oxygen content (20.9%).
2. Turn on the unit as described above in Turning On the GX-3R Pro.
3. Press and hold AIR. The LCD prompts you to continue holding AIR and the buzzer pulses
while you hold the button (if KEY TONE is set to ON in User Mode).
4. Continue to hold AIR until the LCD prompts you to release it. The GX-3R Pro sets the fresh
air readings for all channels. Start up is complete and the unit is now ready for monitoring.
30 • Chapter 3: Operation
GX-3R Pro (TIIS Version) Operator’s Manual
5. If Password Protection is turned On (factory setting is Off) using the SDM-3R PC program,
a user-set password is required to perform a demand zero. When the password screen appears,
adjust each digit with the AIR button and press and release the POWER MODE button to
move on to the next digit. Once the password is entered, the instrument performs the demand
zero.
7:49
0000
PASSWORD
Turning Off the GX-3R Pro
1. Press and hold POWER MODE.
2. TURN OFF appears on the display and the buzzer pulses for about five seconds (if KEY
TONE is set to ON in User Mode).
3. Release the button when TURN OFF disappears from the display.
4. If Password Protection is turned On (factory setting is Off) using the SDM-3R PC program,
a user-set password is required to turn off the GX-3R Pro. When the password screen appears,
adjust each digit with the AIR button and press and release the POWER MODE button to
move on to the next digit. Once the password is entered, the instrument shuts off.
7:49
0000
PASSWORD
5. If you plan to leave the instrument off for an extended period of time, see page 134.
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 3: Operation • 31
Measuring Mode Operation
When the GX-3R Pro completes its startup sequence, it is in Measuring Mode. In Measuring
Mode the GX-3R Pro continuously monitors the sampled atmosphere and displays the target gas
concentrations. The GX-3R Pro is considered to be in Normal Operation if there are no alarm
indications.
S
CH4
%LEL
O2
%
0
7:49
CO
ppm
0
H2S
CO2
ppm
0.0
vol%
20.9
0.00
Heart Symbol: The heart symbol in the upper left corner of the LCD indicates the operation status
and blinks when normal. A microprocessor error causes the heart symbol to stop flashing or to
disappear.
Check Mark: If BUMP REMINDER is set to ON and if a bump test is not due, a check mark
appears in the upper left corner of the LCD.
“S”: If the instrument is operating in Stealth Mode, an “S” appears at the top of the LCD.
Buzzer Icon: The buzzer icon indicates the buzzer volume. Lines in front of the icon indicate a
high buzzer volume. No lines in front of the icon indicates a low buzzer volume.
Bluetooth Icon: The Bluetooth icon flashes when the instrument is trying to pair to a phone. The
Bluetooth icon is steadily on when the instrument is paired to a phone. The Bluetooth icon is off
when the instrument is not paired and is not trying to pair to a phone.
Backlight: In a low-light environment, press and release either button to turn on the display
backlight. See page 108 to set the backlight time.
Confirmation/Non-Compliance Indicator: If the BEEP menu item in User Mode is set to anything
other than OFF, the GX-3R Pro gives periodic indications to confirm that it’s operating or to
indicate a non-compliance (see page 106 for instructions).
Monitoring an Area
1. Start up the GX-3R Pro as described above in “Start Up” on page 24. It is now in Measuring
Mode.
7:49
CH4
%LEL
O2
%
0
CO
20.9
ppm
0
CO2
H2S
ppm
0.0
vol%
0.00
2. Take the GX-3R Pro to the monitoring area.
3. Wait at least 15 seconds and observe the display for gas readings. If a reading is observed,
allow the reading to stabilize to determine the gas concentration(s) present.
If you are sampling with an aspirator adapter, see page 36.
32 • Chapter 3: Operation
GX-3R Pro (TIIS Version) Operator’s Manual
4. If a gas alarm occurs, take appropriate action. See page 40.
5. Do not expose the GX-3R Pro to rain.
6. The GX-3R Pro’s IP 66/68 ratings do not imply that the GX-3R Pro will detect gas during and
after exposure to those conditions. If exposure occurs, dry the instrument with a cloth and
perform a bump test as described on page 68.
7. If the GX-3R Pro gets exposed to flammable liquids:
a. Wipe the instrument off with a cloth dampened with water.
b. Replace the filters as described on page 122 and page 125 if they became saturated
c. Perform a bump test as described on page 68.
8. If you suspect that the GX-3R Pro is not operating correctly:
a. Take the GX-3R Pro to a fresh air environment and perform a demand zero as described
on page 29.
b. Perform a bump test as described on page 68.
Combustible Gas Detection
There are three issues to keep in mind when monitoring for combustible gas.
Response
The combustible gas sensor responds to any combustible gas. The standard calibrated target gas
for the combustible gas channel is methane (CH4). If the instrument is setup for and calibrated to
a different combustible gas, such as hexane or propane, the gas name right above the readings
displays as “HC”.
• Automatic Conversion
The GX-3R Pro can automatically display converted target gas readings if the instrument’s
calibrated target gas is methane or isobutane. See “Combustible Sensor Target Gas
Conversion (HC GAS LIST)” on page 48.
• Manual Conversion
You can manually calculate a converted target gas reading using table below if the
instrument’s calibrated target gas is methane. The table below lists the conversion factors
for several hydrocarbon gases if the GX-3R Pro is calibrated to methane.
To use this table, multiply the display reading on the combustible gas channel by the factor
in the appropriate row to obtain the actual gas concentration. For example, if you are
detecting ethylene and the display reads 10% LEL for the combustible gas channel, you
actually have 10% LEL x 0.83 = 8.3% LEL ethylene present.
Table 5: LEL Hydrocarbon Conversion Factors
Gas
LEL Conversion Factor
(from CH4 Cal.)
Gas
LEL Conversion Factor
(from CH4 Cal.)
Acetone
2.22
IPA
1.64
Acetylene
1.43
Isobutane
1.10
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 3: Operation • 33
Table 5: LEL Hydrocarbon Conversion Factors
Gas
LEL Conversion Factor
(from CH4 Cal.)
Gas
LEL Conversion Factor
(from CH4 Cal.)
Benzene
2.50
MEK
2.63
Butadiene
1.52
Methane
1.00
Cyclopentane
1.45
Methanol
1.82
DME
1.16
MIBK
4.00
Ethane
0.94
MMA
3.33
Ethanol
1.96
Nonane
9.09
Ethyl Acetate
2.86
Propane
1.12
Ethylene
0.83
Propylene
0.97
Heptane
3.13
THF
2.33
Hexane
1.89
Toluene
4.55
Hydrogen
0.95
Xylene
7.69
Overscale Protection
The GX-3R Pro protects the combustible gas sensor by temporarily turning off the sensor power if
levels exceeding 100% LEL are detected. Nevertheless, combustible gas concentrations above
100% LEL can still affect the zero level or calibration of the combustible gas sensor.
CAUTION: Do not expose the combustible gas sensor to high concentrations of combustible
gas such as that from a butane lighter. Exposure to high concentrations of
combustible gas may adversely affect the performance of the sensor.
CAUTION: Any rapid increase in the combustible gas reading on the combustible gas channel
followed by a declining or erratic reading may indicate a gas concentration above
the LEL which may be hazardous.
Damaging Gases
Some gases such as silicone vapors, chlorinated hydrocarbons, and sulphur compounds can
contaminate the sensor’s detection elements. This causes sensor damage and/or a reduced
response to combustible gas. Make every effort to avoid these gases.
The H2S scrubber disks protect the combustible sensor from H2S, but you should avoid other
sulphur compounds.
34 • Chapter 3: Operation
GX-3R Pro (TIIS Version) Operator’s Manual
HC Gas List Alarm
An HC Gas List alarm can occur at startup or after a calibration.
The combustible gas sensor actually contains 2 separate sensors: a standard catalytic sensor and a
backup, poison-resistant sensor that is resistant to sensor poisons like silicone. An HC Gas List
alarm indicates that the standard sensor has a reduced output, possibly due to one or more sensor
poisons in the environment, and that the poison-resistant sensor is being used to provide gas
readings. The poison-resistant sensor has a limited list of detectable gases. The table shown on
page 48 shows which gases can and cannot be detected after receiving an HC Gas List alarm.
If your application requires detection of a gas still detectable after an HC Gas List condition (like
methane or isobutane), there is no need to replace the combustible gas sensor.
However, if your application requires detection of a gas not detectable after an HC Gas List
condition (like methanol or ethanol), you must replace the combustible gas sensor as soon as
possible.
Oxygen-Enriched Atmospheres
The GX-3R Pro is not intended for use in oxygen-enriched atmospheres.
WARNING: Do not use the GX-3R Pro in an environment whose oxygen concentration is
above 21% .
H2-Compensated CO Detection
• GX-3R displays CO readings.
• H2 reading is not displayed but “H2 RICH” appears once the H2 concentration rises above
2000 ppm.
NOTE: The H2-compensated CO sensor may not effectively compensate for high
levels of H2 if exposed to temperatures above 40°C for longer than 15
minutes. Under these conditions, it can appear to the instrument that the H2
concentration has exceeded 2000 ppm, the max concentration that can be
compensated for, resulting in a CO reading higher than the actual CO level.
Interference Information
Some gases interfere with CO, H2S, and super toxic sensors. For a complete list of these gases,
see page 200.
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 3: Operation • 35
CO2 Detection
• A background level of CO2 exists in fresh air. table 6 below indicates a typical gas reading
in fresh air.
Table 6: Carbon Dioxide Fresh Air Readings
Sensor Range
Approximate Fresh Air
Reading
0 - 10.00% volume
0.04% volume
0 - 10,000 ppm
400 ppm
• Performing a demand zero, an auto zero, or an AIR CAL will either set to CO2 channel to
400 ppm (0.04% volume) or exclude the CO2 channel based on the setting of the
CO2AIR SETTING User Mode parameter. See page 112 for more information.
Aspirator Adapter Sampling
FRONT
O2 TOXIC
LEL
CO/H2S
AIR
GX-3R Pro
POWER
MODE
The aspirator adapter accessory is used when it is necessary to draw sample from an area that
cannot be entered or that must be checked for safety before entry, such as a tank or confined
space.
Aspirator Bulb
Sample Cup
Hose
Probe
Figure 6: GX-3R Pro Aspirator Adapter
1. Turn on the GX-3R Pro as described on page 24.
36 • Chapter 3: Operation
GX-3R Pro (TIIS Version) Operator’s Manual
2. Attach the sample cup to the GX-3R Pro. Use the label and imprinting to make sure that the
sample cup gets installed in the correct orientation relative to the GX-3R Pro. Be sure the
sample cup is pushed on all the way.
3. Screw the probe onto the threaded end of the hose.
4. Attached the hose and probe to the aspirator bulb.
5. Insert the end of the probe into the area to be sampled.
6. Squeeze and release the aspirator bulb 15 times.
7. Monitor the readings and note if any alarms occur. The readings will peak shortly after the last
squeeze and may decrease before all the channels can be checked. Use the Peak screen in
Display Mode to see the maximum readings for each channel (see page 49).
NOTE: The peak readings for each channel are saved until a higher peak is recorded,
the peak readings are reset, or the instrument is turned off. If a gas is present
but the level does not exceed the previous peak level, the previous peak will
be displayed on the Peak Screen.
Alarms
This section covers alarm indications in Measuring Mode. It also describes responding to and
resetting an alarm condition.
NOTE: False alarms may be caused by radio frequency (RF) or electromagnetic (EMI)
interference. Keep the GX-3R Pro away from RF and EMI sources such as radio
transmitters or large motors.
Alarm Indications
The GX-3R Pro buzzer sounds an alarm, the LEDs flash, and the vibrator pulses when any sort of
alarm condition or failure occurs. If the GX-3R Pro is operating in Stealth Mode, the buzzer does
not sound and the vibrator’s operation depends on the VIBRATION setting in Gas Select Mode’s
STEALTH menu item. See page 193 for more information.
NOTE: If an alarm condition occurs while you are in Display Mode, the GX-3R Pro
automatically returns to the Measuring Mode screen.
The table below summarizes the GX-3R Pro’s alarm types and indications.
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 3: Operation • 37
None of the Man Down alarm indications occur if MAN DOWN is set to OFF (factory setting) in
User Mode. The Panic alarm does not occur if PANIC is set to OFF (factory setting) in User
Mode.
Alarm Type
Visual Indications
Other Indications
Warning
Concentration of gas rises above the
Warning setting or falls below the
Warning setting for O2.
• Affected channel’s gas reading
flashes and the units field
alternates between the units and
AL1
• High-low tone sounding
once per second
• Vibrator pulses once per
second
• Alarm LEDs flash in circle
sequence once per second
• Backlight turns on
Alarm
Concentration of gas rises above the
Alarm setting or falls below the
Alarm setting for O2.
• Affected channel’s gas reading
flashes and the units field
alternates between the units and
AL2
• High-low tone sounding
twice per second
• Vibrator pulses twice
per second
• Alarm LEDs flash in circle
sequence twice per second
• Backlight turns on
Alarm H
Concentration of gas rises above the
Alarm H setting.
• Affected channel’s gas reading
flashes and the units field
alternates between the units and
AL3
• High-low tone sounding
twice per second
• Vibrator pulses twice
per second
• Alarm LEDs flash in circle
sequence twice per second
• Backlight turns on
TWA or STEL
Concentration of CO, H2S, CO2, or
super toxic gas rises above the TWA
or STEL alarm setting.
• Affected channel’s gas reading
flashes and the units field
alternates between the units and
TWA or STEL.
• High-low tone sounding
once per second
• Vibrator pulses once per
second
• Alarm LEDs flash in circle
sequence once per second
• Backlight turns on
H2 RICH (for GX-3R Pros with H2compensated CO sensor)
Concentration of hydrogen rises
above 2000 ppm (parts per million).
• H2 and RICH alternate in the
lower right corner
• High-low tone sounding
twice per second
• Alarm LEDs flash twice per
second
• Vibrator pulses twice
per second
• Backlight turns on
38 • Chapter 3: Operation
GX-3R Pro (TIIS Version) Operator’s Manual
Alarm Type
Visual Indications
Other Indications
Over Range
• Affected channel’s gas reading is
replaced by flashing OVER and
the units field alternates between
the units and OVER.
• High-low tone sounding
twice per second
• Vibrator pulses twice
per second
• Alarm LEDs flash in circle
sequence twice per second
• Backlight turns on
Minus Over Range
• Affected channel’s gas reading is
replaced by flashing -OVER and
the units field alternates between
the units and MOVER.
• High-low tone sounding
twice per second
• Vibrator pulses twice
per second
• Alarm LEDs flash in circle
sequence twice per second
• Backlight turns on
Low Battery Warning
• The last bar in the battery icon
starts flashing
None
Dead Battery Alarm
• Gas readings disappear and FAIL
BATTERY appears at the bottom
of the LCD
Double pulsing tone once
per second
• Alarm LEDs flash once per
second
Sensor Failure
• FAIL SENSOR appears at the
bottom of the LCD and the failed
sensor(s) are indicated with FAIL
under the gas name.
Double pulsing tone once
per second
• Alarm LEDs flash once per
second
HC Gas List
• READ GAS LIST IN MANUAL
appears on the screen.
Double pulsing tone once
per second
• Alarm LEDs flash once per
second
Clock Failure
• FAIL CLOCK appears at the
bottom of the LCD
Double pulsing tone once
per second
• Alarm LEDs flash once per
second
System Failure
• FAIL SYSTEM appears at the
bottom of the LCD and an error
code displays in the middle of the
LCD
Double pulsing tone once
per second
• Alarm LEDs flash once per
second
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 3: Operation • 39
Alarm Type
Visual Indications
Other Indications
Man Down Warning 1
The WARNING 1 TIME defined in
User Mode has passed since the
instrument detected movement.
• Alarm LEDs flash once per
second
Single pulsing tone once
per second
Man Down Warning 2
The WARNING 2 TIME defined in
User Mode has passed since the
instrument detected movement.
• Alarm LEDs flash twice per
second
Single pulsing tone twice
per second
Man Down Alarm
The ALARM TIME defined in User
Mode has passed since the instrument detected movement.
• MAN DOWN appears at the
bottom of the LCD and the gas
readings disappear
• High-low tone sounding
twice per second
• Alarm LEDs flash in circle
sequence twice per second
• Vibrator pulses twice
per second
• Backlight turns on
Panic
User double taps the
instrument.
Pre
Alarm
• Screen unaffected for 5 seconds
Main
Alarm
• PANIC appears at the bottom of
the LCD and the gas readings
disappear
• Alarm LEDs flash twice per
second
• Alarm LEDs flash in circle
sequence twice per second
• Single pulsing tone
twice per second for 5
seconds
• High-low tone sounding
twice per second
• Vibrator pulses twice
per second
• Backlight turns on
Responding to Alarms
This section describes response to gas, over range, battery, sensor failure, HC Gas List, clock
failure, system failure, man down, and panic alarms.
Responding to Gas Alarms
1. Determine which gas alarm has been activated.
2. Follow your established procedure for an increasing gas condition or a decreasing oxygen
condition.
3. Reset the alarm as necessary or allowed.
40 • Chapter 3: Operation
GX-3R Pro (TIIS Version) Operator’s Manual
Buzzer Silence
Buzzer silence can be turned on or off using the SDM-3R PC Controller program or the GX-3R
Datalogging Program.
Table 7 summarizes resetting and silencing alarms for all LATCHING and SILENCE setting
combinations.
Table 7: Resetting and Silencing Alarms
LATCHING: ON (factory setting)
LATCHING: OFF
• Press and release the POWER
MODE or AIR buttons to silence the
buzzer.
• Press and release the POWER MODE
or AIR buttons to silence the buzzer.
• If the gas concentration was still
above the alarm level when the
button was pressed, the LED arrays
continue to flash, the vibrator
continues to pulse, and the GX-3R
continues to display the current
alarm level.
BUZZER
SILENCE:
ON
• The POWER MODE or AIR buttons
will not reset the alarm.
• The alarm, LEDs, and vibrator will
automatically reset when gas reading
falls below (or rises above for an
oxygen low alarm) an alarm setpoint.
• The gas reading must fall below (or
rise above for an oxygen low alarm)
an alarm setting before you can reset
the alarm, the LEDs, and the
vibrator using the POWER MODE
or AIR buttons.
NOTE: If Password Protection is ON
(factory setting: OFF) using the
SDM-3R PC program, you must press
POWER MODE and AIR
simultaneously and then enter the
user-set password to reset an alarm
condition.
BUZZER
SILENCE:
OFF
(factory
setting)
• Pressing POWER MODE or AIR
will not silence buzzer.
• Pressing POWER MODE or AIR will
not silence buzzer.
• The gas reading must fall below (or
rise above for an oxygen low alarm)
an alarm setting before you can reset
the alarm condition using the
POWER MODE or AIR buttons.
• The alarm condition will
automatically reset when the gas
reading falls below (or rises above for
an oxygen low alarm) an alarm
setpoint.
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 3: Operation • 41
Responding to an H2 RICH Alarm (H2-Compensated CO Sensor Only)
The H2 RICH alarm automatically clears once the hydrogen level decreases below 2000 ppm
(parts per million).
Responding to Over Range Alarms
WARNING: An over range condition may indicate an extreme combustible gas, toxic gas, or
oxygen concentration. Confirm the gas concentration with a different GX-3R Pro
or with another gas detecting device.
CAUTION: High off-scale readings may indicate an explosive concentration.
1. Determine which channel is in alarm.
2. Follow your established procedure for an extreme gas condition.
3. If LATCHING is set to ON (factory setting) in Maintenance Mode, reset the alarm using
POWER MODE or AIR once the alarm condition clears.
If Password Protection is turned On (factory setting is Off) using the SDM-3R PC
program, you must press POWER MODE and AIR at the same time and then enter a userset password to reset an alarm condition. When the password screen appears, adjust each
digit with the AIR button and press and release the POWER MODE button to move on to
the next digit. Once the password is entered, the alarm condition resets.
7:49
0000
PASSWORD
4. Calibrate the GX-3R Pro as described on page 75.
5. If the over range condition continues or if you are not able to successfully calibrate the unit,
you may need to replace the sensor that has triggered the over range alarm.
6. If the over range condition continues after you have replaced the sensor, contact RKI
Instruments, Inc. for further instructions.
42 • Chapter 3: Operation
GX-3R Pro (TIIS Version) Operator’s Manual
Responding to Battery Alarms
WARNING: The GX-3R Pro is not operational as a gas monitoring device during a dead
battery alarm. Take the Model GX-3R Pro to a non-hazardous area and replace
or recharge the batteries as described on page 118 and page 120.
The GX-3R Pro is fully functional during a low battery warning. Proper instrument operation is
only guaranteed for 10 minutes but the instrument will operate for 1-2 hours after the start of the
alarm. However, only 1-2 hours of operating time remains. The amount of operating time left
depends on LCD backlight use and the alarm frequency. Recharge the Li-ion battery pack (page
120) or replace the alkaline batteries (page 118) as soon as possible.
NOTE: Alarms and the LCD backlight consume battery power and reduce the amount of
operating time remaining.
Responding to Sensor Failure Alarms
1. Determine which sensor triggered the sensor failure alarm.
2. Calibrate the failed sensor, as described on page 75.
3. If the sensor failure continues or if the sensor could not be calibrated, replace the sensor as
described on page 127.
4. If the sensor failure condition continues, contact RKI Instruments, Inc. for further
instructions.
Responding to an HC Gas List Alarm
An HC Gas List alarm can occur at startup or after a calibration.
1. Press and release POWER MODE to acknowledge the alarm.
The combustible gas sensor actually contains 2 separate sensors: a standard catalytic sensor and a
backup, poison-resistant sensor that is resistant to sensor poisons like silicone. An HC Gas List
alarm indicates that the standard sensor has a reduced output, possibly due to one or more sensor
poisons in the environment, and that the poison-resistant sensor is being used to provide gas
readings. The poison-resistant sensor has a limited list of detectable gases. Table 10 on page 51
shows which gases can and cannot be detected after receiving an HC Gas List alarm.
If your application requires detection of a gas still detectable after an HC Gas List condition (like
methane or isobutane), there is no need to replace the combustible gas sensor.
However, if your application requires detection of a gas not detectable after an HC Gas List
condition (like methanol or ethanol), you must replace the combustible gas sensor as soon as
possible.
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 3: Operation • 43
Responding to Clock Failure Alarms
A clock failure alarm occurs if the unit’s internal clock malfunctions. A clock failure alarm might
also occur if the battery becomes too drained during storage. See page 134 for storage
information.
7:49
FAIL CLOCK
1. Press and release POWER MODE to continue into Measuring Mode.
CAUTION: If you operate the instrument after a clock failure, data will still be
logged but the date/time will be incorrect. Set the date/time as described
on page 112 as soon as possible to ensure logged data uses the correct
date/time.
2. Attempt to set the date using the DATE User Mode menu item as described on page 112.
3. If the date cannot be set correctly, contact RKI Instruments, Inc. as soon as possible.
Responding to System Failure Alarms
1. If a system failure occurs, an error code displays as shown below:
7:49
031
FAIL SYSTEM
2. The error code meanings are shown in the table below:
44 • Chapter 3: Operation
Error Code
Explanation
000
ROM failure
010
RAM failure
021
FRAM failure
031
FLASH memory failure
080
Acceleration sensor failure
081
PCB failure
082
Temperature sensor failure
083
Bluetooth failure
GX-3R Pro (TIIS Version) Operator’s Manual
3. If the error code is anything but 031, the instrument cannot be used. Contact RKI Instruments,
Inc. as soon as possible.
If the error code is 031, you may press and release POWER MODE to continue into
Measuring Mode if the instrument must be used temporarily.
CAUTION: There will be no datalogging function if you operate the instrument after
a 031 system failure. Contact RKI Instruments, Inc. as soon as possible.
Responding to a Man Down Warning 1 and Warning 2
The Man Down Warning 1 and Warning 2 alarms occur after the WARNING 1 TIME and
WARNING 2 TIME, respectively, has passed since the last movement of the instrument. See
page 100 for instructions to change these values.
1. Follow your established procedure for a man down warning.
2. To silence the alarm and reset the Man Down clock, move the instrument or press and release
POWER MODE.
Responding to a Man Down Alarm
The Man Down Alarm alarms occur after the ALARM TIME has passed since the last
movement of the instrument. See page 100 for instructions to change this value.
1. Follow your established procedure for a man down alarm.
2. To silence the alarm and reset the Man Down clock, press and release POWER MODE or
AIR. Moving the instrument will not reset the alarm or Man Down clock.
Responding to a Panic Alarm
If the user is in a dangerous situation or feels that others must be alerted to any sort of problem,
forcefully tapping the instrument twice will initiate a panic alarm.
1. Press and release POWER MODE or AIR to silence and reset the alarm.
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 3: Operation • 45
Data Logging
The GX-3R Pro logs Measuring Mode gas readings, alarm data, and calibration data to its internal
memory. Logged data can be download it to a computer via the infrared communications port on
the front of the unit.
To utilize the GX-3R Pro’s downloading capability, you will need the GX-3R Data Logger
Management Program and a computer with an infrared port or a USB port that runs one of the
following operating systems: Windows 7, Windows 8, Windows 10, or Windows 11. If your
computer has an infrared port, then no additional accessories are needed to download data from
the GX-3R Pro. If your computer does not have an infrared port but does have a USB port, a USB/
IrDA adapter cable can be used to download data from the GX-3R Pro. The GX-3R Data Logger
Management Program is available at www.rkiinstruments.com/gx3rpro. The USB/IrDA adapter
cable is available from RKI Instruments, Inc.
The data logging capacity depends on how often the GX-3R Pro stores data, how many channels
are active, and how often the GX-3R Pro is turned on and off. The table below illustrates how
much data logging time is available for the various interval times. It assumes that the unit has four
sensors, is only turned on once, and there are no alarm occurrences. The data logging interval time
must be set using the GX-3R Data Logger Management Program.
Table 8: Data Logging Capacity
Interval Time
Data Logging
Time
10 seconds
10 hours
20 seconds
20 hours
30 seconds
30 hours
1 minute
60 hours
3 minutes
180 hours
5 minutes (factory setting)
300 hours
10 minutes
600 hours
For a complete description of the Data Logger Management Program and procedures for
downloading data to a computer, see the GX-3R Data Logger Management Program Operator’s
Manual.
46 • Chapter 3: Operation
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 4: Display Mode
This section describes Display Mode which is accessible from Measuring Mode. See the table 8
below for a list of Display Mode’s menu items, a short description of each item, and the page
number for further description.
Table 9: Display Mode Items
Display Mode
Menu Item
Description
PEAK (page 49)
Displays each sensor’s Peak reading.
STEL (page 50)
Displays the STEL readings (CO, H2S, and CO2/super toxic only).
TWA (page 50)
Displays the TWA readings (CO, H2S, and CO2/super toxic only).
HC GAS LIST
(page 50)A
Change the target gas for the catalytic sensor.
• CH4 (methane)
• n-C6H14 (hexane)
• i-C4H10 (isobutane)
• C7H8 (toluene)
• H2 (hydrogen)
• n-C7H16 (heptane)
• CH3OH (methanol)
• C8H10 (xylene)
• C2H2 (acetylene)
• n-C9H20 (nonane)
• C2H4 (ethylene)
• EtAc (ethyl acetate)
• C2H6 (ethane)
• IPA (isopropyl alcohol)
• C2H5OH (ethanol)
• MEK (methyl ethyl ketone)
• C3H6 (propylene)
• MMA (methyl methacrylate)
• C3H6O (acetone)
• DME (dimethyl ether)
• C3H8 (propane)
• MIBK (methyl isobutyl ketone)
• C4H6 (butyne)
• THF (tetrahydrofuran)
• C5H10 (cyclopentane)
• n-C5H12 (n-pentane)
• C6H6 (benzene)
USER ID
(page 53)C
View and/or change the User ID.
STATION ID
(page 54)C
View and/or change the Station ID.
CAL DATA
(page 54)D
Displays the last calibration date for each sensor.
BUMP DATA
(page 55)E
Displays the last bump test date for each sensor.
DATE (page 56)
Displays the current date, time, and temperature.
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 4: Display Mode • 47
Table 9: Display Mode Items
Display Mode
Menu Item
Description
ALARM POINTS
(page 57)
View alarm points
INVERT SELECT
(page 58)B
ON: The LCD stays upside down relative to the instrument.
AUTO: The LCD automatically flips as the instrument is rotated to remain
readable whether the instrument is right side up or upside down.
OFF (factory setting): The LCD stays right side up relative to the instrument.
LCD BACKGROUND
(page 58)B
ON: LCD has black background with white characters.
OFF (factory setting): LCD has white background with black characters.
BLUETOOTH
(page 59)B
ON: Turns Bluetooth functionality on.
OFF (factory setting): Turns Bluetooth functionality off.
BUZZER
VOLUME
(page 59)B
HIGH (factory setting): Buzzer volume is high.
LOW: Buzzer volume is low.
LANGUAGE
(page 60)F
Change the language of the instrument back to English if something other
than English was selected in User Mode.
A Only appears if D MODE SETTING is set to ON in User Mode (factory setting) and if CH4 or i-
C4H10 is selected for the combustible gas in Gas Select Mode.
Only appears if D MODE SETTING is set to ON in User Mode (factory setting).
C
Only appears if D MODE SETTING is set to ON in User Mode (factory setting) and if ID DISPLAY is set to ON in Maintenance Mode (factory setting is OFF).
D
Only appears if CAL REMINDER is set to ON in User Mode (factory setting).
E
Only appears if BUMP REMINDER is set to ON in User Mode (factory setting is OFF).
F
Only appears if LANGUAGE is set to something other than ENGLISH in Maintenance Mode.
B
Tips for Using Display Mode
• To enter Display Mode and scroll from one menu item to the next or skip an item when a
question is asked, press and release POWER MODE.
• To enter an item, press and release AIR.
• To change a flashing parameter, use AIR. To reverse the direction of movement in a list (ie.
from down to up or vice versa):
a. Press and hold AIR.
b. Immediately press POWER MODE and then release both buttons.
48 • Chapter 4: Display Mode
GX-3R Pro (TIIS Version) Operator’s Manual
• To exit from an entered-information screen and go back to the main menu, press and release
POWER MODE.
NOTE: Each screen displays for 20 seconds. If you do not press a button for 20 seconds, the
GX-3R Pro automatically returns to Measuring Mode.
Peak Screen (PEAK)
The peak screen displays the highest (lowest for oxygen) concentrations detected since the GX3R Pro was turned on. Peak readings are stored in the GX-3R Pro’s memory until a higher level is
detected (lower for oxygen), the peak reading is cleared, or the GX-3R Pro is turned off.
The lunch break feature enables the GX-3R Pro to save peak readings when it is turned off so it
can continue with the same peaks when it is turned on again. See page 105 for instructions to turn
the lunch break feature on (default is off).
To clear the peak readings, do the following:
NOTE: If Password Protection is set to On using the SDM-3R PC program, the peak reading
cannot be cleared.
1. While in Display Mode, press and release POWER MODE until PEAK appears.
7:49
CH4
O2
%LEL
12
%
CO
ppm
7
CO2
18.7
H2S
ppm
23.0
vol%
5.50
PEAK
2. Press and hold AIR until the screen prompts you to release it.
7:49
HOLD AIR KEY
PEAK CLEAR
7:49
RELEASE
PEAK CLEAR
3. The peak readings are reset and the unit returns to the Peak Screen.
If you do not want to clear the peak readings, release AIR before the above screen
sequence occurs. The unit returns to the Peak Screen.
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 4: Display Mode • 49
STEL Screen (STEL)
The STEL Screen displays the short term exposure limit (STEL) readings for H2S, CO, CO2, and
super toxic only. The STEL reading is the average reading over the last 15 minutes.
7:49
CO
ppm
H2S
2
CO2
ppm
3.0
vol%
1.50
STEL
TWA Screen (TWA)
The TWA Screen displays the time weighted average (TWA) readings for H2S, CO, CO2, and
super toxic only.
7:49
CO
ppm
6
CO2
H2S
ppm
5.5
vol%
0.75
TWA
The TWA reading is the average reading over the last 8 hours. If 8 hours have not elapsed since
the last time the TWA reading was cleared, the average is still calculated over 8 hours. The
missing readings are assigned a 0 value. If LUNCH BREAK is set to OFF (factory setting), the
TWA is cleared when the GX-3R Pro is turned off.
If LUNCH BREAK is set to ON, the GX-3R Pro will remember TWA readings when it is turned
off so it can continue them when it is turned on again. See page 105 for instructions to turn the
lunch break feature on (default is off).
Combustible Sensor Target Gas Conversion (HC
GAS LIST)
This screen only appears if D MODE SETTING in User Mode is set to ON (factory setting) and
if the instrument’s calibrated target gas is CH4 or iC4H10 (select target gas in Gas Select Mode’s
GAS COMBO item, calibrate with target gas in User Mode’s GAS CAL item).
The HC GAS LIST screen allows you to select a converted target gas based on a CH4 or iC4H10
calibration. It does not change the calibrated target gas. You must go to Gas Select Mode’s GAS
COMB item to change the calibrated target gas.
Selecting a converted target gas in HC GAS LIST (based on a CH4 or iC4H10 calibration) does
not provide the same reading accuracy as selecting a calibrated target gas in Gas Select Mode’s
GAS COMBO item and calibrating with that target gas in User Mode.
50 • Chapter 4: Display Mode
GX-3R Pro (TIIS Version) Operator’s Manual
Selecting a converted target gas in HC GAS LIST does not mean that the combustible gas sensor
will respond only to that gas. The combustible gas sensor responds to a number of gases
regardless of the target gas selection.
NOTE: If H2 is selected as the target gas in HC GAS LIST, the sensor will only respond to H2
and will not respond to any other gas, regardless of the gas listings in Table 10.
If you select a new converted target gas, the change is saved if you turn the instrument off and on.
Table 10: Available HC Gas Conversions
Gas
Available Converted
Target Gases Based on
Calibrated Target Gas
(Selected in Gas Select
Mode)
Available
Converted Target
Gases During HC
Gas List Condition
CH4
(methane)
i-C4H10
(isobutane)
CH4 (methane)
-
x
O
i-C4H10 (isobutane)
O
-
O
H2 (hydrogen)
O
O
O
CH3OH (methanol)
O
O
x
C2H2 (acetylene)
O
O
O
C2H4 (ethylene)
O
O
O
C2H6 (ethane)
O
x
O
C2H5OH (ethanol)
O
O
x
C3H6 (propylene)
O
O
O
C3H6O (acetone)
O
O
x
C3H8 (propane)
O
x
O
C4H6 (butyne)
O
O
O
C5H10 (cyclopentane)
O
O
O
C6H6 (benzene)
O
O
x
n-C6H14 (hexane)
O
O
O
C7H8 (toluene)
O
O
x
n-C7H16 (heptane)
O
O
O
C8H10 (xylene)
O
O
x
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 4: Display Mode • 51
Table 10: Available HC Gas Conversions
Available Converted
Target Gases Based on
Calibrated Target Gas
(Selected in Gas Select
Mode)
Gas
Available
Converted Target
Gases During HC
Gas List Condition
CH4
(methane)
i-C4H10
(isobutane)
n-C9H20 (nonane)
O
O
x
EtAc (ethyl acetate)
O
O
x
IPA (isopropyl alcohol)
O
O
x
MEK (methyl ethyl ketone)
O
O
x
MMA (methyl methacrylate)
O
O
x
DME (dimethyl ether)
O
O
x
MIBK (methyl isobutyl
ketone)
O
O
x
THF (tetrahydrofuran)
O
O
x
n-C5H12 (n-pentane)
O
O
O
x = not available
O = available
1. While in Display Mode, press and release POWER MODE until HC GAS LIST appears. The
current setting displays on the top line.
7:49
7:49
CH4
CHANGE : AIR
HC GAS LIST
CH4
NO : MODE
HC GAS LIST
2. Press and release AIR to enter the screen. A cursor appears to the left of the current gas
selection.
7:49
CH4
i-C4H10
H2
HC GAS LIST
52 • Chapter 4: Display Mode
GX-3R Pro (TIIS Version) Operator’s Manual
3. Use AIR to scroll through the list of gases.
4. With the cursor next to the desired gas, press and release POWER MODE. The instrument
saves the changes and returns to the HC GAS LIST screen.
5. The gas formula displays at the bottom of the Measuring Mode screen. The gas selection
remains in effect if you turn the instrument off and on again.
User ID Screen (USER ID)
This screen only appears if D MODE SETTING in User Mode is set to ON (factory setting) and
if ID DISPLAY in Maintenance Mode is set to ON (factory setting is OFF).
Use this screen to select a user ID from the 128 user IDs stored in the GX-3R Pro’s memory.
Before a user ID is selected on a brand new instrument, the user ID is “----------”. The factoryinstalled user IDs have a “U_ID_XXX” format.
The user ID provides a way to identify the GX-3R Pro user during a data logging session.
User IDs can only be selected in this menu item. You must use the GX-3R Datalogging Program
to edit the 128 user IDs.
1. After entering Display Mode, press and release POWER MODE until USER ID appears.
7:49
7:49
U_ID_002
U_ID_002
CHANGE : AIR
USER ID
NO : MODE
USER ID
2. To change the User ID, press and release AIR. The current User ID flashes.
7:49
U_ID_002
USER ID
3. Use AIR to scroll to the desired User ID.
4. Press and release POWER MODE to save the User ID and return to the USER ID screen in
Display Mode.
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 4: Display Mode • 53
Station ID Screen (STATION ID)
This screen only appears if D MODE SETTING in User Mode is set to ON (factory setting) and
if ID DISPLAY in Maintenance Mode is set to ON (factory setting is OFF).
Use this screen to select a station ID from the 128 station IDs stored in the GX-3R Pro’s memory.
Before a station ID is selected on a brand new instrument, the station ID is
“----------”. The factory-installed station IDs have a “S_ID_XXX” format.
The station ID provides a way to identify the GX-3R Pro location during a data logging session.
Station IDs can only be selected in this menu item. You must use the GX-3R Datalogging
Program to edit the 128 station IDs.
1. After entering Display Mode, press and release POWER MODE until STATION ID appears.
7:49
7:49
S_ID_002
S_ID_002
CHANGE : AIR
STATION ID
NO : MODE
STATION ID
2. To change the station ID, press and release AIR. The current station ID flashes.
7:49
S_ID_002
STATION ID
3. Use AIR to scroll to the desired station ID.
4. Press and release POWER MODE to save the station ID and return to the STATION ID
screen in Display Mode.
Last Successful Calibration Date (CAL DATA)
The CAL DATA screen shows the date of each installed sensors’ last successful calibration. This
screen only appears if CAL REMINDER is set to ON in User Mode.
1. While in Display Mode, press and release POWER MODE until CAL DATA appears.
7:49
YES : AIR
NO : MODE
CAL DATA
54 • Chapter 4: Display Mode
GX-3R Pro (TIIS Version) Operator’s Manual
2. Press AIR to enter the CAL DATA screen and to scroll through the installed sensors.
7:49
MM/DD/YYYY
10/16/2018
AIR
H2S
7:49
CAL DATA
MM/DD/YYYY
10/16/2018
CH4
CAL DATA
AIR
7:49
MM/DD/YYYY
10/16/2018
AIR
CO
7:49
CAL DATA
MM/DD/YYYY
10/16/2018
AIR
O2
7:49
CAL DATA
AIR
MM/DD/YYYY
10/16/2018
CO2
CAL DATA
3. When you are done viewing the last calibration date for the sensors, press and release
POWER MODE to return to the CAL DATA screen in Display Mode.
Last Successful Bump Test Date (BUMP DATA)
The BUMP DATA screen shows the date of each installed sensors’ last successful bump test.
This screen only appears if BUMP REMINDER is set to ON in User Mode.
1. While in Display Mode, press and release POWER MODE until BUMP DATA appears.
7:49
YES : AIR
NO : MODE
BUMP DATA
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 4: Display Mode • 55
2. Press AIR to enter the BUMP DATA screen and to scroll through the installed sensors.
7:49
AIR
MM/DD/YYYY
10/16/2018
H2S
7:49
BUMP DATA
MM/DD/YYYY
10/16/2018
CH4
BUMP DATA
AIR
7:49
MM/DD/YYYY
10/16/2018
AIR
CO
7:49
BUMP DATA
MM/DD/YYYY
10/16/2018
AIR
O2
BUMP DATA
7:49
AIR
MM/DD/YYYY
10/16/2018
CO2
BUMP DATA
3. When you are done viewing the last bump test date for the sensors, press and release POWER
MODE to return to the BUMP DATA screen in Display Mode.
Date, Time, Temperature Screen (DATE)
The DATE screen shows the date and time of the instrument and the temperature of the
surrounding area.
1. While in Display Mode, press and release POWER MODE until DATE appears.
7:49
MM/DD/YYYY
1/14/2019
7:49
DATE
24°C
56 • Chapter 4: Display Mode
GX-3R Pro (TIIS Version) Operator’s Manual
Alarm Points Screen (ALARM POINTS)
The Alarm Points Screen shows the gas alarm settings for all active channels.
1. While in Display Mode, press and release POWER MODE until ALARM POINTS appears.
7:49
YES : AIR
NO : MODE
ALARM POINTS
2. Press and release AIR to enter the Alarm Points screen. The Full Scale Settings screen appears
and shows full scale settings for each channel.
3. Use AIR to scroll through the Warning, Alarm, Alarm H, STEL, and TWA settings.
7:49
CH4
%LEL
CO
ppm
7:49
H2S
ppm
100 2000 200.0
O2
%
CO2
vol%
40.0
10.00
FULL SCALE
AIR
CH4
O2
%LEL
CO
%
CO2
10
O2
CO
%
ppm
25
3.00
ALARM H
AIR
7:49
H2S
CO2
ppm
5.0
CO
vol%
19.5
25
%
H2S
CO
ppm
50
CO2
18.0
vol%
STEL
AIR
7:49
H2S
ppm
30.0
vol%
CO
ppm
25
H2S
CO2
3.00
ALARM
ppm
5.0
3.00
7:49
O2
200
0.50
AIR
%LEL
ppm
CO2
WARNING
CH4
ppm
vol%
23.5
7:49
%LEL
H2S
50 1200 100.0
AIR
CH4
ppm
ppm
1.0
vol%
0.50
TWA
AIR
4. While viewing the alarm settings for a particular alarm point, press and release AIR and
POWER MODE at the same time to simulate the alarm conditions. The buzzer will sound, the
LEDs will flash, and the instrument will vibrate just as it would if the displayed condition was
actually happening.
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 4: Display Mode • 57
5. Press and release POWER MODE to return to the ALARM POINTS item in Display Mode.
Screen Inversion On/Off (INVERT SELECT)
The INVERT SELECT screen allows you to turn the screen inversion function on or off. This
screen only appears if D MODE SETTING in User Mode is set to ON (factory setting).
ON: The LCD stays upside down relative to instrument.
AUTO: The LCD automatically flips to remain readable whether the instrument is right side up or
upside down.
OFF (factory setting): The LCD stays right side up relative to the instrument.
1. While in Display Mode, press and release POWER MODE until INVERT SELECT appears.
The current setting displays on the top line.
7:49
OFF
CHANGE : AIR
INVERT SELECT
7:49
OFF
NO : MODE
INVERT SELECT
2. Press and release AIR. The current setting flashes.
3. Use AIR to display the desired setting.
4. Press and release POWER MODE to save the setting and return to the INVERT SELECT
screen.
LCD Color Scheme (LCD BACKGROUND)
The LCD BACKGROUND screen allows you to change the appearance of the LCD. This screen
only appears if D MODE SETTING in User Mode is set to ON (factory setting).
ON: LCD has black background with white characters.
OFF (factory setting): LCD has white background with black characters.
1. While in Display Mode, press and release POWER MODE until LCD BACKGROUND
appears. The current setting displays on the top line.
7:49
OFF
CHANGE : AIR
LCD BACKGROUND
7:49
OFF
NO : MODE
LCD BACKGROUND
2. Press and release AIR. The current setting flashes.
3. Use AIR to display the desired setting.
58 • Chapter 4: Display Mode
GX-3R Pro (TIIS Version) Operator’s Manual
4. Press and release POWER MODE to save the setting and return to the LCD
BACKGROUND screen.
Turning Bluetooth On/Off (BLUETOOTH)
The BLUETOOTH screen allows you to turn the GX-3R Pro’s Bluetooth functionality on and
off. This screen only appears if D MODE SETTING in User Mode is set to ON (factory setting).
ON: Turns Bluetooth functionality on, allowing for connection to the RK Link app on your
phone.
If BLE Auto Shut Off When Idle, accessible in the Datalogging or SDM-3R Program, is
selected (factory setting) and if the GX-3R Pro does not pair to a phone in the first 5 minutes after
startup, the GX-3R Pro’s Bluetooth gets shut off to conserve battery life.
If BLE Auto Shut Off When Idle, accessible in the Datalogging or SDM-3R Program, is
deselected and if the GX-3R Pro does not pair to a phone, the GX-3R Pro’s Bluetooth stays on
indefinitely.
OFF (factory setting): Turns Bluetooth functionality off.
1. While in Display Mode, press and release POWER MODE until BLUETOOTH appears. The
current setting displays on the top line.
7:49
OFF
CHANGE : AIR
BLUETOOTH
7:49
OFF
NO : MODE
BLUETOOTH
2. Press and release AIR. The current setting flashes.
3. Use AIR to display the desired setting.
4. Press and release POWER MODE to save the setting and return to the BLUETOOTH screen.
Adjusting the Buzzer Volume (BUZZER VOLUME)
The BUZZER VOLUME screen allows you to adjust the volume of the instrument’s buzzer. This
screen only appears if D MODE SETTING in User Mode is set to ON (factory setting).
HIGH (factory setting): Buzzer volume is high.
LOW: Buzzer volume is low.
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 4: Display Mode • 59
1. While in Display Mode, press and release POWER MODE until BUZZER VOLUME
appears. The current setting displays on the top line.
7:49
HIGH
CHANGE : AIR
BUZZER VOLUME
7:49
HIGH
NO : MODE
BUZZER VOLUME
2. Press and release AIR. The current setting flashes.
3. Use AIR to display the desired setting.
4. Press and release POWER MODE to save the setting and return to the BUZZER VOLUME
screen.
Changing Instrument Language Back to English
(LANGUAGE)
This screen only appears if the LANGUAGE item in Maintenance Mode is set to something other
than ENGLISH.
1. While in Display Mode, press and release POWER MODE until the LANGUAGE screen
appears.
7:49
LANGUAGE
CHANGE
TO ENGLISH
YES : AIR
7:49
LANGUAGE
CHANGE
TO ENGLISH
NO : MODE
2. Press and release AIR.
7:49
CHANGE
TO ENGLISH
YES : AIR
7:49
CHANGE
TO ENGLISH
NO : MODE
3. Press and release POWER MODE to confirm that you want to change the language back to
English.
60 • Chapter 4: Display Mode
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 5: User Mode and Calibration
Overview
This section describes the GX-3R Pro in User Mode. See Table 11 for a list of the items found in
User Mode, the page that the menu item’s instructions can be found on, and a short description of
the menu item.
Table 11: User Mode Items
User Mode
Menu Item
BUMP TEST (page
68)
GAS CAL (page 75)
Description
Perform a bump test.
BUMP TEST
CYL X
Perform a bump test on the gases selected for Cylinder X
(A-E cylinders available).
START
MEASURE
Begin the warmup sequence and enter Measuring Mode.
ESCAPE
Return to BUMP TEST menu item.
Perform a fresh air adjustment, perform a span adjustment, change the calibration gas
concentration, set the cylinder group.
AIR CAL (page
75)
Perform a fresh air adjustment.
CO2 ZERO CAL
(page 76)
Perform a zero adjustment on the CO2 channel using 100% nitrogen.
NOTE: Only appears in units with a CO2 sensor installed.
AUTO CAL
(page 79)
ESCAPE
GX-3R Pro (TIIS Version) Operator’s Manual
AUTO CAL
CYL X
Perform an automatic span adjustment on the
gases selected for Cylinder X (A-E cylinders
available).
START
MEASURE
Begin the warmup sequence and enter Measuring
Mode.
SETTING
CAL-P
Set the calibration gas concentration for each gas.
CYL
SETTING
Assign a cylinder (A-E) to each gas. Multiple
gases can be assigned to the same cylinder.
ESCAPE
Return to the AUTO CAL menu item.
Return to the GAS CAL menu item.
Chapter 5: User Mode and Calibration • 61
Table 11: User Mode Items
User Mode
Menu Item
CAL SETTING
(page 90)
BUMP SETTING
(page 93)
Description
Change calibration parameters.
CAL
REMINDER
(page 90)
ON (factory setting): The instrument notifies the user upon startup
when a calibration is due. Notification type depends on CAL
EXPD setting below.
OFF: No notification upon startup when a calibration is due.
CAL
INTERVAL (page
91)
How often the instrument needs to be calibrated.
Options: 1 - 1000 days (factory setting is 90 days)
CAL EXPIRED
(page 91)
Defines what action must be taken if a calibration is due upon
startup.
CONFIRM TO USE (factory setting): Press and release AIR to
acknowledge that calibration is due and continue to Measuring
Mode.
CANNOT USE: Cannot enter Measuring Mode until a successful
calibration is performed.
NO EFFECT: A screen indicates that calibration is due but warmup sequence continues.
CAL CHECK
GAS (page 92)
ALL GAS (factory setting): Calibration dates for all gases are used
to determine if calibration is due.
4 GAS: Calibration dates for only the standard 4 gases (combustible gas/O2/H2S/CO) are used to determine if calibration is due.
ESCAPE
Return to the CAL SETTING menu item in User Mode.
Change bump test parameters.
BUMP
PARAMETER
(page 93)
62 • Chapter 5: User Mode and Calibration
GAS TIME
How long gas is applied during a bump test.
Choices: 30 (factory setting), 45, 60, 90 seconds
TOLERANCE
Percentage of calibration gas concentration that
the bump test reading must be within in order to
pass bump.
Options: 10%, 20%, 30%, 40%, 50% (factory
setting)
CAL TIME
How long gas is applied during a calibration.
GAS TIME is deducted from this time.
Options: 90 (factory setting) or 120 seconds
AUTO CAL
ON (factory setting): If a bump test fails, a calibration automatically starts.
OFF: If a bump test fails, a calibration does not
automatically start.
GX-3R Pro (TIIS Version) Operator’s Manual
Table 11: User Mode Items
User Mode
Menu Item
BUMP SETTING
(page 93) cont.
MAN DOWN (page
99)
Description
BUMP
PARAMETER
(page 93)
cont.
ESCAPE
Return to the BUMP PARAMETER menu item
in BUMP SETTINGS.
BUMP
REMINDER
(page 96)
ON: The instrument notifies the user upon startup when a bump
test is due. Notification type depends on BUMP EXPIRED setting
below.
OFF (factory setting): No notification upon startup when a bump
test is due.
BUMP
INTERVAL (page
97)
How often the instrument needs to be bump tested.
Options: 0 - 30 days (factory setting is 30 days)
BUMP
EXPIRED (page
97)
Defines what action must be taken if a bump test is due upon
startup.
CONFIRM TO USE (factory setting): Press and release AIR to
acknowledge that bump test is due and continue to Measuring
Mode.
CANNOT USE: Cannot enter Measuring Mode until a successful
bump test is performed.
NO EFFECT: A screen indicates that bump test is due but warmup
sequence continues.
BUMP CHECK
GAS (page 98)
ALL GAS (factory setting): Bump test dates for all gases are used
to determine if bump test is due.
4 GAS: Bump test dates for only the standard 4 gases (combustible
gas/O2/H2S/CO) are used to determine if bump test is due.
ESCAPE
Return to the BUMP SETTING menu item in User Mode.
Turn the man down and panic alarms on and off. Set the intervals for man down alarms.
MAN DOWN
(page 99)
ON: Man down alarm is triggered if the instrument does not detect
motion during time period defined in WARNING 1 TIME,
WARNING 2 TIME, and ALARM TIME below.
OFF (factory setting): No man down alarm triggered.
PANIC (page
100)
ON: Panic alarm can be triggered.
OFF (factory setting): Panic alarm cannot be triggered.
MAN DOWN
TIME (page 100)
ALARM TIME
WARNING 2 TIME
TIME
The settings range is 10 - 240 seconds.
GX-3R Pro (TIIS Version) Operator’s Manual
WARNING 1
Chapter 5: User Mode and Calibration • 63
Table 11: User Mode Items
User Mode
Menu Item
MAN DOWN (page
99) cont.
Description
MAN DOWN
TIME (page 100)
cont.
ESCAPE
WARNING 1
TIME
The amount of time that passes between a man
down detection and the first warning alarm. Factory setting is 60 seconds.
WARNING 2
TIME
The amount of time that passes between a man
down detection and the second warning alarm.
Factory setting is 75 seconds.
ALARM
TIME
The amount of time that passes between a man
down detection and a man down alarm. Factory
setting is 90 seconds.
Return to the MAN DOWN menu item.
ALARM SETTING
(page 101)
Set alarm points for all channels (WARNING, ALARM, ALARM H, STEL, TWA) or
reset all alarms to their default settings.
LUNCH BREAK
(page 105)
ON: Lunch break feature is on. At startup, instrument asks if you want to resume TWA
and PEAK readings.
OFF (factory setting): Lunch break feature is off. Instrument resets TWA and PEAK
readings every time it’s turned on.
CONFIRMATION
(page 105)
Set confirmation beep parameters.
BEEP SELECT
(page 106)
LED: LEDs flash and instrument vibrates based on interval
defined in BEEP INTERVAL to confirm instrument is still operating.
BUZZER: Buzzer sounds and instrument vibrates based on interval defined in BEEP INTERVAL to confirm instrument is still
operating.
LED+BUZZER: LEDs flash, buzzer sounds, and instrument
vibrates based on interval defined in BEEP INTERVAL to confirm instrument is still operating.
BUMP/CAL: LEDs flash based on interval defined in BEEP
INTERVAL if bump test or calibration is due.
ALARM ALERT: LEDs flash based on interval defined in BEEP
INTERVAL if instrument goes into a gas alarm.
BUMP/CAL/ALARM: LEDs flash based on interval defined in
BEEP INTERVAL if a) bump test is due, b) calibration is due, or
c) instrument goes into a gas alarm.
OFF (factory setting): No alerts to confirm instrument is still operating or that a bump test or calibration are due.
64 • Chapter 5: User Mode and Calibration
GX-3R Pro (TIIS Version) Operator’s Manual
Table 11: User Mode Items
User Mode
Menu Item
CONFIRMATION
(page 105) cont.
Description
BEEP
INTERVAL (page
107)
Confirmation alert interval. Confirmation type defined in BEEP
SELECT.
Options: 0.5 minute and 1 to 99 minutes in 1 minute increments.
Factory setting is 5 minutes.
ESCAPE
Return to the CONFIRMATION menu item in User Mode.
AUTO BACKLIGHT (page 108)
ON (factory setting): The instrument’s backlight automatically turns on in a low light
environment.
OFF: The instrument’s backlight does not automatically turn on in a low light environment.
BACKLIGHT TIME
(page 108)
How long the back light stays on after the last button press.
Options: 0 - 255 seconds or OFF. The factory setting is 30 seconds.
KEY TONE (page
109)
ON (factory setting): Buzzer sounds when a button is pressed.
OFF: Buzzer does not sound when a button is pressed.
D MODE SETTING (page 109)
OFF: LIST, USER ID, STATION ID, INVERT SELECT, LCD BACKGROUND,
BLUETOOTH, BUZZER VOLUME, and LANGUAGE items do not appear in Display Mode.
ON (factory setting): LIST, INVERT SELECT, LCD BACKGROUND, BLUETOOTH, BUZZER VOLUME, and LANGUAGE items appear in Display Mode.
USER ID and STATION ID screens appear if ID DISPLAY in Maintenance Mode is
also set to ON.
ZERO SUPPRESS
(page 110)
ON (factory setting): Not intended for field adjustment. The suppression values are:
Combustible Gas: 2% LEL
O2: 0.5% volume
H2S: 0.3 ppm
CO: 2 ppm
CO2: 0 ppm
HCN: 0.5 ppm
NH3: 4 ppm
NO2: 0.30 ppm
PH3: 0.02 ppm
SO2: 0.20 ppm
NOTE: Only appears if DISP ZERO SUP is set to ON in Maintenance Mode.
ZERO FOLLOWER (page 110)
Not intended for field adjustment. The default setting is ON for every channel except
oxygen. Oxygen channel does not support zero follower functionality.
NOTE: Only appears if DISP ZERO FLWR is set to ON in Maintenance Mode.
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 5: User Mode and Calibration • 65
Table 11: User Mode Items
User Mode
Menu Item
Description
IR UNIT SELECT
(page 111) cont.
Select the units for the IR CO2 sensor.
Options: vol% or ppm
NOTE: Only appears in units with a CO2 sensor installed.
CO2AIR SETTING
(page 111)
ON: CO2 channel is set to 400 ppm (0.04% volume) during a demand zero, auto zero, or
AIR CAL.
OFF (factory setting): CO2 channel is not adjusted during a demand zero, auto zero, or
AIR CAL.
NOTE: Only appears in units with a CO2 sensor installed.
DATE (page 112)
Set the current date and time.
DATE FORMAT
(page 112)
MM/DD/YYYY (factory setting): month/day/year
YYYY/MM/DD: year/month/day
DD/MM/YYYY: day/month/year
LANGUAGE (page
113)
Set the instrument language.
Options: English (factory setting), Japanese, Italian, Spanish, German, French, Portuguese, Russian, Korean, Chinese (TC)
USER PASSWORD
(page 113)
ON: User Mode access is password-protected. Factory-set password is 0405.
OFF (factory setting): User Mode access is not password-protected.
ROM/SUM (page
114)
View the firmware information for the GX-3R Pro’s sensor board and main board.
RADIO
STANDARD (page
115)
Approval numbers for radio agencies.
START MEASURE
(page 116)
Press and release POWER MODE to begin the warmup sequence and enter Measuring
Mode.
Entering User Mode
WARNING: The GX-3R Pro is not in operation as a gas detector while in User Mode.
1. Take the GX-3R Pro to a non-hazardous location and turn it off if it is on.
2. Press and hold AIR, then press and hold POWER MODE. Release the buttons when you hear
a beep.
66 • Chapter 5: User Mode and Calibration
GX-3R Pro (TIIS Version) Operator’s Manual
3. The screen that appears depends on the setting of User Mode’s USER PASSWORD item.
If USER PASSWORD is set to OFF (factory setting), continue with Step 6.
If USER PASSWORD is set to ON, continue with Step 4.
MAINTE
7:49
MAINTE
BUMP TEST
GAS CAL
CAL SETTING
USER MODE
7:49
0000
PASSWORD
USER PASSWORD set to OFF
USER PASSWORD set to ON
4. If USER PASSWORD in User Mode is set to ON, a password screen appears and the first
digit flashes.
5. Use AIR to select each password number then press POWER MODE to save it and move on
to the next number. To go back a number, press and hold AIR and POWER MODE for a few
seconds. To reverse the direction of change (ie. from increasing to decreasing or vice versa):
a. Press and hold AIR.
b. Immediately press POWER MODE and then release both buttons.
6. The User Mode menu displays.
MAINTE
7:49
BUMP TEST
GAS CAL
CAL SETTING
USER MODE
7.
MAINTE
at the top of the screen indicates that the GX-3R is in User Mode.
8. Use AIR to move through the User Mode menu items.
Tips for Using User Mode
• To scroll from one menu item to the next, press and release AIR. To reverse the scrolling
direction:
a. Press and hold AIR.
b. Immediately press POWER/MODE and then release both buttons.
c. The scrolling direction returns to the original direction when you exit and reenter a menu.
• To skip an item when a question is asked, press and release AIR.
• To enter an item and to save any changes, press and release POWER MODE.
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 5: User Mode and Calibration • 67
• To change a flashing parameter, press and release AIR. To reverse the direction of change (ie.
from increasing to decreasing or vice versa):
a. Press and hold AIR.
b. Immediately press POWER MODE and then release both buttons.
• To exit an entered menu item without saving a change, press and hold AIR and POWER
MODE for a few seconds.
Performing a Bump Test (BUMP TEST)
Bump test the instrument before each day’s use with a known concentration of each target gas.
The instrument does not need to be calibrated unless it does not pass the bump test.
To bump test the GX-3R Pro, you will need:
• Known calibrating samples of the gases being detected
Channel
Min. Cal. Gas
Concentration
Max. Cal. Gas
Concentration
Combustible Gas
5% LEL
75% LEL
Oxygen
0.0%
17.0%
Hydrogen Sulfide
1.0 ppm
200.0 ppm
Carbon Monoxide
15 ppm
2,000 ppm
Ammonia
8 ppm
400 ppm
Carbon Dioxide (0 - 10,000 ppm)
3,000 ppm
9,000 ppm
Carbon Dioxide (0 - 10.00% vol)
1.00% vol
4.00% vol
Hydrogen Cyanide
0.9 ppm
30.0 ppm
Nitrogen Dioxide
0.50 ppm
20.00 ppm
Phosphine
0.05 ppm
20.00 ppm
Sulfur Dioxide
0.50 ppm
100.00 ppm
• A 0.25 LPM fixed flow regulator
• Non-absorbent tubing
• Calibration cup
1. Confirm that the GX-3R Pro’s calibration gas values match the concentrations listed on the
calibration gas cylinder(s) as described on page 85.
2. Confirm that your cylinder selections are appropriate as described on page 87.
68 • Chapter 5: User Mode and Calibration
GX-3R Pro (TIIS Version) Operator’s Manual
3. Install the calibration cup onto the GX-3R Pro. Use the label and imprinting to make sure that
the calibration cup gets installed in the correct orientation relative to the GX-3R Pro. Be sure
the calibration cup is pushed on all the way.
POWER
MODE
AIR
GX-3R Pro
CO/H2 S
LEL
O2 TOXIC
FRONT
Inlet
Figure 7: Calibration Cup Installation
4. Use the tubing to connect the regulator to the inlet of the calibration cup.
5. While in User Mode, use AIR to place the cursor next to BUMP TEST.
MAINTE
7:49
BUMP TEST
GAS CAL
CAL SETTING
USER MODE
6. Press and release POWER MODE. The display shows the gases assigned to Cylinder A and
their assigned calibration values (see page 85 if the calibration values do not match the
calibration gas cylinder’s concentrations).
MAINTE
CH4
O2
%LEL
50
CO
7:49
ppm
50
H2S
ppm
25.0
%
12.0
BUMP TEST
CYLINDER A
7. If necessary, use AIR to scroll to the Bump screen for the gas(es) you want to bump test. As
shipped from the factory, the standard 4 gases (combustible gas, O2, CO, and H2S) are
assigned to Cylinder A. If a H2-compensated CO sensor is installed, H2 is assigned to
Cylinder D but there is no reason to bump test the H2 response. Toxic sensors are assigned to
Cylinder D or Cylinder E.
8. Make sure the GX-3R Pro has been turned on for at least 45 seconds before continuing.
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 5: User Mode and Calibration • 69
9. For toxic gas cylinders (like cylinders containing H2S), it is important to vent the regulator
while installing it onto the cylinder. Venting the regulator during installation helps prevent air
from getting into the cylinder and degrading the gas. Open the regulator by turning the knob
counterclockwise and install it onto the cylinder.
10. With the appropriate Bump screen displayed, press and release POWER MODE.
11. The gas readings flash, the bottom of the screen indicates “BUMP TEST” and “APPLY
GAS”, and the top of the screen counts down from the time defined in BUMP
SETTING\BUMP PARAMETER\GAS TIME.
MAINTE
CH4
%LEL
O2
%
0
CO
30
ppm
0
H2S
ppm
0.0
20.9
BUMP TEST
APPLY GAS
NOTE: To back out of the gas application screen without performing the bump test,
press and release AIR and POWER MODE together.
70 • Chapter 5: User Mode and Calibration
GX-3R Pro (TIIS Version) Operator’s Manual
12. At the end of the countdown, the instrument analyzes the results. Follow the flow chart to
determine the bump test outcome.
Y
N
Bump test passed?
Multiple Cylinders
Assigned?
Y
AUTO CAL On?
(default is on)
N
Y
N
A
D
Auto start after successful bump
set to on? (default is on)
Y
N
B
C
Calibration passed?
Y
N
E
Multiple Cylinders
Assigned?
Y
N
F
Auto start after successful cal
set to on? (default is on)
Y
N
G
H
*NOTE: Auto start after successful bump/cal parameters set using Datalogging or SDM-3R PC Programs.
Figure 8: Bump Test Flow Chart
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 5: User Mode and Calibration • 71
Option A from Flow Chart
Option B from Flow Chart
Option C from Flow Chart
• Bump test passed
• Bump test passed
• Bump test passed
• Multiple cylinders assigned
• One cylinder assigned
• One cylinder assigned
• Auto Start After Successful Bump set
to ON (factory setting)
• Auto Start After Successful Bump set
to OFF (factory setting is ON)
1. The instrument indicates that all
channels passed the bump test. Use
AIR to scroll between the bump test
results and the bump test gas
readings.
1. The instrument indicates that all
channels passed the bump test. Use
AIR to scroll between the bump test
results and the bump test gas
readings.
1. The instrument indicates that all
channels passed the bump test. Use
AIR to scroll between the bump test
results and the bump test gas
readings.
MAINTE
CH4
%LEL
P
O2
CO
MAINTE
7:49
P
ppm
H2S
CH4
ppm
P
%LEL
P
O2
%
CO
7:49
P
ppm
MAINTE
H2S
ppm
CH4
P
%
%LEL
P
O2
P
P
RESULT
RESULT
RESULT
MAINTE
CH4
O2
%LEL
47
CO
47
P
AIR
7:49
ppm
MAINTE
H2S
ppm
CH4
23.3
%
O2
%LEL
47
CO
47
MAINTE
H2S
ppm
CH4
23.3
%
O2
%LEL
47
CO
11.9
11.9
BUMP TEST
BUMP TEST
BUMP TEST
2.
3.
4.
5.
72 • Chapter 5: User Mode and Calibration
ppm
P
Close the regulator.
Unscrew the regulator.
Remove the calibration cup.
Press and release POWER MODE
to enter Measuring Mode.
7:49
ppm
47
H2S
ppm
23.3
%
11.9
2. Close the regulator.
3. Press and release POWER MODE
to move to the BUMP CYL X
screen for the next cylinder.
4. Unscrew the regulator from the first
cylinder and screw it into the next
cylinder.
5. Repeat Step 9 through Step 12.
6. After the last cylinder is bump
tested, press and release POWER
MODE to go to the START item in
the BUMP menu.
7. Press and release POWER MODE
to enter Measuring Mode.
H2S
AIR
7:49
ppm
7:49
ppm
%
P
AIR
CO
2.
3.
4.
5.
Close the regulator.
Unscrew the regulator.
Remove the calibration cup.
Press and release POWER MODE
to return to the START item in the
BUMP menu.
6. Press and release POWER MODE
to enter Measuring Mode.
GX-3R Pro (TIIS Version) Operator’s Manual
Option D from Flow Chart
Option E from Flow Chart
Option F from Flow Chart
• Bump test failed
• A-CAL set to OFF (factory setting is ON)
• Bump test failed
• A-CAL set to ON (factory setting)
• Calibration failed
• Bump test failed
• A-CAL set to ON (factory setting)
• Calibration passed
• Multiple cylinders assigned
1.
1.
1.
The instrument shows which channels
passed or failed the bump test. The LEDs
flash and the buzzer sounds. Use AIR to
scroll between the results and the readings.
MAINTE
CH4
%LEL
P
O2
CO
2.
7:49
P
ppm
H2S
F
ppm
A calibration immediately and
automatically starts. Continue to apply the
calibration gas.
The calibration time is the difference
between the GAS TIME and the CAL
TIME values defined in the BUMP
SET\SETTINGS item in User Mode.
MAINTE
%
P
CH4
RESULT
AIR
MAINTE
CH4
O2
%LEL
47
CO
ppm
47
H2S
ppm
3.
2.0
%
11.9
BUMP TEST
2.
3.
4.
5.
6.
7.
H2S
30
CH4
ppm
The instrument shows which channels
passed or failed the bump test/calibration.
The LEDs flash and the buzzer sounds. Use
AIR to scroll between the results and the
readings.
CH4
%LEL
F P
O2
CO
ppm
H2S
APPLY GAS
MAINTE
CH4
%LEL
O2
%
F P
ppm
F F
CO
P
ppm
F P
AIR
AIR
MAINTE
CH4
MAINTE
%LEL
30
CO
7:49
ppm
H2S
47
ppm
2.0
O2
%LEL
30
CO
AIR
MAINTE
CH4
%LEL
ppm
12.0
BUMP TEST
AIR
47
H2S
47
%
BUMP TEST
MAINTE
7:49
ppm
11.9
%
11.9
CH4
H2S
RESULT
RESULT
O2
7:49
ppm
P
%
P
CH4
ppm
2.0
The instrument shows which channels
passed or failed the bump test/calibration.
Use AIR to scroll between the results and
the readings.
7:49
P
H2S
30
AUTO CAL
3.
60
%LEL
2.0
APPLY GAS
MAINTE
Close the regulator.
Unscrew the regulator.
Remove the calibration cup.
Press and release POWER MODE to return
to the BUMP CYL A item in the BUMP
menu.
Use AIR to scroll to START and press and
release POWER MODE to enter Measuring
Mode.
Calibrate the GX-3R Pro as soon as
possible.
MAINTE
60
%LEL
AUTO CAL
7:49
2.
A calibration immediately and
automatically starts. Continue to apply the
calibration gas.
The calibration time is the difference
between the GAS TIME and the CAL
TIME values defined in the BUMP
SET\SETTINGS item in User Mode.
7:49
H2S
ppm
%LEL
47
7:49
H2S
ppm
20.5
2.5
AUTO CAL
AUTO CAL
4.
5.
6.
7.
8.
Close the regulator.
Unscrew the regulator.
Remove the calibration cup.
Press and release POWER MODE to return
to the BUMP CYL A item in the BUMP
menu.
Use AIR to scroll to START and press and
release POWER MODE to enter Measuring
Mode.
GX-3R Pro (TIIS Version) Operator’s Manual
4.
5.
6.
7.
8.
9.
Close the regulator.
Press and release POWER MODE to move
to the BUMP CYL X screen for the next
cylinder.
Unscrew the regulator from the first
cylinder and screw it into the next cylinder.
Repeat Step 9 through Step 12.
After the last cylinder is bump tested, press
and release POWER MODE to go to the
START item in the BUMP menu.
Press and release POWER MODE to enter
Measuring Mode.
Chapter 5: User Mode and Calibration • 73
Option G from Flow Chart
Option H from Flow Chart
• Bump test failed
• A-CAL set to ON (factory setting)
• Calibration passed
• One cylinder assigned
• Auto Start After Successful Cal set to ON
(factory setting)
• Bump test failed
• A-CAL set to ON (factory setting)
• Calibration passed
• One cylinder assigned
• Auto Start After Successful Cal set to
OFF (factory setting is ON)
1. A calibration immediately and
automatically starts. Continue to apply
the calibration gas.
2. The calibration time is the difference
between the GAS TIME and the CAL
TIME values defined in the BUMP
SET\SETTINGS item in User Mode.
1. A calibration immediately and
automatically starts. Continue to apply
the calibration gas.
2. The calibration time is the difference
between the GAS TIME and the CAL
TIME values defined in the BUMP
SET\SETTINGS item in User Mode.
MAINTE
CH4
60
%LEL
MAINTE
H2S
30
AUTO CAL
ppm
2.0
APPLY GAS
3. The instrument shows which channels
passed or failed the bump test/
calibration. Use AIR to scroll between
the results and the readings.
MAINTE
CH4
%LEL
F P
O2
CH4
CO
P
H2S
30
AUTO CAL
APPLY GAS
MAINTE
H2S
ppm
CH4
F P
%LEL
F P
%
O2
CO
P
RESULT
RESULT
P
AIR
MAINTE
O2
%LEL
30
CO
MAINTE
H2S
47
ppm
CH4
12.0
%
O2
%LEL
30
CO
11.9
BUMP TEST
BUMP TEST
AIR
MAINTE
47
MAINTE
H2S
ppm
CH4
20.5
AUTO CAL
4.
5.
6.
7.
Close the regulator.
Unscrew the regulator.
Remove the calibration cup.
Press and release POWER MODE to
enter Measuring Mode.
74 • Chapter 5: User Mode and Calibration
7:49
ppm
H2S
47
ppm
12.0
AIR
7:49
%LEL
ppm
F P
%
11.9
CH4
H2S
AIR
7:49
ppm
7:49
ppm
%
P
CH4
ppm
2.0
3. The instrument shows which channels
passed or failed the bump test/
calibration. Use AIR to scroll between
the results and the readings.
7:49
ppm
60
%LEL
%LEL
47
7:49
H2S
ppm
20.5
AUTO CAL
4.
5.
6.
7.
Close the regulator.
Unscrew the regulator.
Remove the calibration cup.
Press and release POWER MODE to
return to the START item in the BUMP
menu.
8. Press and release POWER MODE to
enter Measuring Mode.
GX-3R Pro (TIIS Version) Operator’s Manual
Performing a Calibration (GAS CAL)
Calibration Notes
• To fully calibrate the standard 4 (combustible gas, O2, CO, H2S) and super toxic sensors,
you must do a fresh air adjustment (AIR CAL) and a span adjustment (AUTO CAL).
• To fully calibrate the IR CO2 sensor, you must do either a) a fresh air adjustment (AIR
CAL) and a span adjustment (AUTO CAL) or b) a zero adjustment (CO2 ZERO CAL)
and a span adjustment (AUTO CAL).
• Bump test the instrument before each day’s use with a known concentration of each target
gas. A bump test can be done in User Mode’s BUMP TEST item or by applying gas in
Measuring Mode. The instrument does not need to be calibrated unless it does not pass the
User Mode bump test or does not respond appropriately, as defined by the user, in
Measuring Mode.
• The hydrogen response for the H2-compensated CO sensor needs to be calibrated monthly
and when the sensor is replaced.
Performing a Fresh Air Adjustment (AIR CAL)
1. Find a fresh air environment, an environment of normal oxygen content (20.9%) that is free of
toxic and combustible gases.
2. While in User Mode, use AIR to place the cursor next to GAS CAL.
MAINTE
7:49
BUMP TEST
GAS CAL
CAL SETTING
USER MODE
3. Press and release POWER MODE. The Gas Cal menu appears.
4. Use AIR to place the cursor next to AIR CAL.
MAINTE
7:49
AIR CAL
CO2 ZERO CAL
AUTO CAL
GAS CAL
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 5: User Mode and Calibration • 75
5. Press and release POWER MODE. The example below shows the standard 4 sensors
(combustible gas, O2, CO, H2S).
MAINTE
CH4
%LEL
O2
%
0
CO
7:49
ppm
0
H2S
ppm
0.0
20.9
AIR CAL
6. Make sure the GX-3R Pro has been turned on for at least 45 seconds before continuing.
7. Press and hold AIR until the screen prompts you to release it.
MAINTE
7:49
HOLD AIR KEY
AIR CAL
MAINTE
7:49
ADJUSTING ZERO
RELEASE
8. If the fresh air adjustment passes, the instrument returns to the Gas Cal menu.
9. If the fresh air adjustment fails, “FAIL AIR” displays. Press and release POWER MODE to
acknowledge the failure. See “Troubleshooting” on page 117.
Performing a Zero Adjustment on the CO2 Sensor
(CO2 ZERO CAL)
Performing a zero adjustment on the CO2 sensor sets the sensor’s zero to a known concentration
of CO2 (0 ppm or 0%).
Preparing for a CO2 ZERO CAL
To set the zero reading on the CO2 sensor, you will need:
• 100% nitrogen (N2) cylinder
• 0.25 LPM fixed flow regulator
• Non-absorbent tubing
• Calibration cup
1. Confirm that the regulator knob is turned all the way clockwise. Screw the 0.25 LPM fixed
flow regulator onto the calibration cylinder.
76 • Chapter 5: User Mode and Calibration
GX-3R Pro (TIIS Version) Operator’s Manual
2. Install the calibration cup onto the GX-3R Pro. Use the label and imprinting to make sure that
the calibration cup gets installed in the correct orientation relative to the GX-3R Pro. Be sure
the calibration cup is pushed on all the way.
POWER
MODE
AIR
GX-3R Pro
CO/H2 S
LEL
O2 TOXIC
FRONT
Inlet
Figure 9: Calibration Cup Installation
3. Use the tubing to connect the regulator to the inlet of the calibration cup.
Performing a CO2 ZERO CAL
1. While in User Mode, use AIR to place the cursor next to GAS CAL.
MAINTE
7:49
BUMP TEST
GAS CAL
CAL SETTING
USER MODE
2. Press and release POWER MODE. The Gas Cal menu appears.
3. Use AIR to place the cursor next to CO2 ZERO CAL.
MAINTE
7:49
AIR CAL
CO2 ZERO CAL
AUTO CAL
GAS CAL
4. Make sure the GX-3R Pro has been turned on for at least 45 seconds before continuing.
5. Press and release POWER MODE.
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 5: User Mode and Calibration • 77
6. The CO2 gas reading flashes and the bottom of the screen indicates “CO2 ZERO CAL” and
“APPLY GAS”.
MAINTE
7:49
CO2
vol%
0.04
CO2 ZERO CAL APPLY GAS
NOTE: To back out of the gas application screen without performing the bump test,
press and release AIR and POWER MODE together.
7. Turn the regulator knob counterclockwise to open the regulator.
8. Allow the gas to flow for 1 minute.
9. Press and release POWER MODE.
10. Turn the regulator knob clockwise to close the regulator.
11. If the zero adjustment passed the screen says “PASS” and the instrument returns to the Gas
Cal menu.
12. If the zero adjustment failed:
a. “FAIL” replaces the gas reading.
MAINTE
7:49
CO2
vol%
FAIL
CO2 ZERO CAL
b. The LEDs flash and the buzzer sounds a double pulsing tone.
c. Press and release POWER MODE to clear the failure. The instrument returns to the GAS
CAL menu.
d. See “Troubleshooting” on page 117.
13. Unscrew the regulator from the calibration cylinder.
14. Remove the calibration cup from the GX-3R Pro.
15. Store the calibration kit in a safe and convenient place.
16. Use AIR to place the cursor next to ESCAPE.
17. Press and release POWER MODE. The instrument returns to User Mode.
78 • Chapter 5: User Mode and Calibration
GX-3R Pro (TIIS Version) Operator’s Manual
Performing a Span Adjustment in AUTO CAL
Preparing for a Span Adjustment
To perform a span adjustment on the GX-3R Pro, you will need:
• Known concentrations of the gases being detected.
Channel
Min. Cal.
Concentration
Max. Cal.
Concentration
Combustible Gas
5% LEL
75% LEL
Oxygen
0.0%
17.0%
Hydrogen Sulfide
1.0 ppm
200.0 ppm
Carbon Monoxide
15 ppm
2,000 ppm
Hydrogen (for H2-compensated CO
sensor); needs monthly calibration
25 ppm
2,000 ppm
Ammonia
8 ppm
400 ppm
Carbon Dioxide (0 - 10,000 ppm)
3,000 ppm
9,000 ppm
Carbon Dioxide (0 - 10.00% vol)
1.00% vol
4.00% vol
Hydrogen Cyanide
0.9 ppm
30.0 ppm
Nitrogen Dioxide
0.50 ppm
20.00 ppm
Phosphine
0.05 ppm
20.00 ppm
Sulfur Dioxide
0.50 ppm
100.00 ppm
• 0.25 LPM fixed flow regulator
• Non-absorbent tubing
• Calibration cup
1. Confirm that the GX-3R Pro’s calibration gas values match the concentrations listed on the
calibration gas cylinder(s) as described on page 85.
2. Confirm that your cylinder selections are appropriate as described on page 87.
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 5: User Mode and Calibration • 79
3. Install the calibration cup onto the GX-3R Pro. Use the label and imprinting to make sure that
the calibration cup gets installed in the correct orientation relative to the GX-3R Pro. Be sure
the calibration cup is pushed on all the way.
POWER
MODE
AIR
GX-3R Pro
CO/H2 S
LEL
O2 TOXIC
FRONT
Inlet
Figure 10: Calibration Cup Installation
4. Use the tubing to connect the regulator to the inlet of the calibration cup.
Performing a Span Adjustment
1. While in User Mode, use AIR to place the cursor next to GAS CAL.
MAINTE
7:49
BUMP TEST
GAS CAL
CAL SETTING
USER MODE
2. Press and release POWER MODE. The Gas Cal menu appears.
3. Use AIR to place the cursor next to AUTO CAL.
MAINTE
7:49
CO2 ZERO CAL
AUTO CAL
ESCAPE
GAS CAL
80 • Chapter 5: User Mode and Calibration
GX-3R Pro (TIIS Version) Operator’s Manual
4. Press and release POWER MODE. The display shows the gases assigned to Cylinder A and
the assigned calibration values (see page 85 if the calibration values do not match the
calibration gas cylinder’s concentrations).
MAINTE
CH4
%LEL
50
O2
CO
7:49
ppm
50
H2S
ppm
25.0
%
12.0
AUTO CAL
CYLINDER A
5. If necessary, use AIR to scroll to the Auto Cal screen for the gas(es) you want to calibrate. As
shipped from the factory, the standard 4 gases (combustible gas, O2, CO, and H2S) are
assigned to Cylinder A. If a H2-compensated CO sensor is installed, H2 is assigned to
Cylinder D but there is no reason to bump test the H2 response. Toxic sensors are assigned to
Cylinder D or Cylinder E.
6. Make sure the GX-3R Pro has been turned on for at least 45 seconds before continuing.
7. Press and release POWER MODE.
8. The gas readings flash and the bottom of the screen indicates “AUTO CAL” and “APPLY
GAS”.
MAINTE
CH4
%LEL
O2
%
0
CO
30
ppm
0
H2S
ppm
0.0
20.9
AUTO CAL
APPLY GAS
NOTE: To back out of the gas application screen without performing the bump test,
press and release AIR and POWER MODE together.
9. For toxic gas cylinders (like cylinders containing H2S), it is important to vent the regulator
while installing it onto the cylinder. Venting the regulator during installation helps prevent air
from getting into the cylinder and degrading the gas. Open the regulator by turning the knob
counterclockwise and install it onto the cylinder.
10. Allow the gas to flow for 1 minute for all gases except NH3. Allow NH3 gas to flow for 2
minutes.
11. Press and release POWER MODE.
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 5: User Mode and Calibration • 81
12. Follow the flow chart to determine the calibration outcome.
Y
Calibration passed?
N
D
Multiple Cylinders
Assigned?
Y
N
A
Auto start after successful cal
set to on? (default is on)
Y
N
B
C
*NOTE: Auto start after successful cal parameter set using Datalogging or SDM-3R PC Programs.
Figure 11: Calibration Flow Chart
82 • Chapter 5: User Mode and Calibration
GX-3R Pro (TIIS Version) Operator’s Manual
Option A from Flow Chart
Option B from Flow Chart
• Calibration passed
• Multiple cylinders assigned
• Calibration passed
• One cylinder assigned
• Auto Start After Successful Cal set to ON (factory setting)
1. The instrument indicates that all channels passed the
calibration.
1. The instrument indicates that all channels passed the
calibration.
7:49
7:49
PASS
PASS
AUTO CAL
AUTO CAL
2. The instrument shows the current gas readings.
MAINTE
CH4
O2
%LEL
47
CO
2. The instrument shows the current gas readings.
7:49
ppm
47
H2S
MAINTE
ppm
CH4
23.3
%
O2
11.9
MAINTE
O2
100
7:49
ppm
47
H2S
ppm
23.3
%
AUTO CAL
3. If DISP MAX SPAN is set to ON (default is OFF, see page
193), the response reading’s max adjustment displays. A max
span of 100% LEL on the combustible channel indicates that
the reading could have been adjusted up to 100% LEL. If the
sensor’s max span value is close to the calibration gas value,
it should be replaced soon. The max adjustment is either
twice the calibration value or full scale, whichever is lower.
The max adjustment indicated for the oxygen channel is
25.0% volume.
%LEL
47
CO
11.9
AUTO CAL
CH4
%LEL
CO
3. If DISP MAX SPAN is set to ON (default is OFF, see page
193), the response reading’s max adjustment displays. A max
span of 100% LEL on the combustible channel indicates that
the reading could have been adjusted up to 100% LEL. If the
sensor’s max span value is close to the calibration gas value,
it should be replaced soon. The max adjustment is either
twice the calibration value or full scale, whichever is lower.
The max adjustment indicated for the oxygen channel is
25.0% volume.
7:49
ppm
70
H2S
MAINTE
ppm
CH4
48.5
%
O2
25.0
%LEL
100
CO
7:49
ppm
70
H2S
ppm
48.5
%
25.0
MAX SPAN
MAX SPAN
4. If the combustible gas sensor is nearing the end of its life, the
reading conversions that can be made in Display Mode’s HC
GAS LIST item becomes limited. Press POWER MODE.
See page 43 for a description of the HC Gas List condition
and page 50 for the limited conversion list.
4. If the combustible gas sensor is nearing the end of its life, the
reading conversions that can be made in Display Mode’s HC
GAS LIST item becomes limited. Press POWER MODE.
See page 43 for a description of the HC Gas List condition
and page 50 for the limited conversion list.
7:49
7:49
READ GAS
LIST IN
MANUAL
5. Close the regulator.
6. The instrument continues to the AUTO CAL CYL X screen.
7. Unscrew the regulator from the first cylinder and screw it into
the next cylinder.
8. Press and release POWER MODE to start the next cylinder’s
calibration.
9. Repeat Step 9 through Step 12.
10. After the last cylinder is calibrated, the instrument continues
to the START MEASURE item in the AUTO CAL menu.
11. Remove the calibration cup.
12. Press and release POWER MODE to enter Measuring Mode.
GX-3R Pro (TIIS Version) Operator’s Manual
READ GAS
LIST IN
MANUAL
5.
6.
7.
8.
Close the regulator.
Unscrew the regulator.
Remove the calibration cup.
The instrument automatically begins its warmup sequence
and enters Measuring Mode.
Chapter 5: User Mode and Calibration • 83
Option C from Flow Chart
Option D from Flow Chart
• Calibration passed
• One cylinder assigned
• Auto Start After Successful Cal set to OFF (factory setting is
ON)
• Calibration failed
1. The instrument indicates that all channels passed the
calibration.
1. The instrument indicates which channels failed the
calibration.
MAINTE
7:49
O2
47
CO
%
7:49
ppm
47
H2S
ppm
23.3
AUTO CAL
2. The instrument shows the current gas readings.
MAINTE
O2
CO
11.9
AUTO CAL
%LEL
%LEL
FAIL
PASS
CH4
CH4
7:49
ppm
47
H2S
ppm
23.3
%
11.9
AUTO CAL
2.
3.
4.
5.
Close the regulator.
Unscrew the regulator.
Remove the calibration cup.
Press and release POWER MODE to return to the AUTO
CAL CYL X screen in the AUTO CAL menu.
6. See “Troubleshooting” on page 117.
3. If DISP MAX SPAN is set to ON (default is OFF, see page
193), the response reading’s max adjustment displays. A max
span of 100% LEL on the combustible channel indicates that
the reading could have been adjusted up to 100% LEL. If the
sensor’s max span value is close to the calibration gas value,
it should be replaced soon. The max adjustment is either
twice the calibration value or full scale, whichever is lower.
The max adjustment indicated for the oxygen channel is
25.0% volume.
MAINTE
CH4
O2
%LEL
100
CO
7:49
ppm
70
H2S
ppm
48.5
%
25.0
MAX SPAN
4. If the combustible gas sensor is nearing the end of its life, the
reading conversions that can be made in Display Mode’s HC
GAS LIST item becomes limited. Press POWER MODE.
See page 43 for a description of the HC Gas List condition
and page 50 for the limited conversion list.
7:49
READ GAS
LIST IN
MANUAL
5.
6.
7.
8.
Close the regulator.
Unscrew the regulator.
Remove the calibration cup.
The instrument continues to the START MEASURE item in
the AUTO CAL menu.
9. Press and release POWER MODE to enter Measuring Mode.
84 • Chapter 5: User Mode and Calibration
GX-3R Pro (TIIS Version) Operator’s Manual
Setting the Calibration Values in SETTING CAL--P
1. While in User Mode, use AIR to place the cursor next to GAS CAL.
MAINTE
7:49
BUMP TEST
GAS CAL
CAL SETTING
USER MODE
2. Press and release POWER MODE. The Gas Cal menu appears.
3. Use AIR to place the cursor next to AUTO CAL.
MAINTE
7:49
CO2 ZERO CAL
AUTO CAL
ESCAPE
GAS CAL
4. Press and release POWER MODE. The Auto Cal screen for gases assigned to Cylinder A
displays.
5. Use AIR to scroll to SETTING CAL--P.
MAINTE
7:49
SETTING CAL--P
6. Press and release POWER MODE. The combustible gas channel displays.
MAINTE
CH4
%LEL
----
SETTING CAL--P
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 5: User Mode and Calibration • 85
7. Use AIR to scroll to the channel whose calibration gas value you want to change.
MAINTE
CH4
7:49
MAINTE
%LEL
CO
AIR
----
SETTING CAL--P
7:49
ppm
----
SETTING CAL--P
AIR
MAINTE
O2
AIR
7:49
MAINTE
7:49
%
CO2
----
vol%
----
SETTING CAL--P
SETTING CAL--P
AIR
MAINTE
AIR
MAINTE
7:49
H2S
7:49
ppm
----
ESCAPE
SETTING CAL--P
8. Press and release POWER MODE. The calibration gas value begins to flash. In the example
below, the combustible gas channel is selected.
9. Use AIR to adjust the calibration gas value. The calibration gas value in the instrument must
match the value listed on the calibration gas cylinder you are using for that channel. Limits on
the calibration gas value are shown in the table below.
Channel
Min. Cal.
Concentration
Max. Cal.
Concentration
Combustible Gas
5% LEL
75% LEL
Oxygen
0.0%
17.0%
Hydrogen Sulfide
1.0 ppm
200.0 ppm
Carbon Monoxide
15 ppm
2,000 ppm
Hydrogen (for H2-compensated
CO sensor); needs monthly calibration
25 ppm
2,000 ppm
86 • Chapter 5: User Mode and Calibration
GX-3R Pro (TIIS Version) Operator’s Manual
Channel
Min. Cal.
Concentration
Max. Cal.
Concentration
Ammonia
8 ppm
400 ppm
Carbon Dioxide (0 - 10,000 ppm)
3,000 ppm
9,000 ppm
Carbon Dioxide (0 - 10.00% vol)
1.00% vol
4.00% vol
Hydrogen Cyanide
0.9 ppm
30.0 ppm
Nitrogen Dioxide
0.50 ppm
20.00 ppm
Phosphine
0.05 ppm
20.00 ppm
Sulfur Dioxide
0.50 ppm
100.00 ppm
10. Press and release POWER MODE to save the change. The calibration gas value stops flashing
and the unit returns to the channel selection screen.
11. Repeat Step 7 through Step 10 for any other channels that need to be changed.
12. Use AIR to place the cursor next to ESCAPE.
13. Press and release POWER MODE. The instrument returns to the SETTING CAL--P menu
item in the Auto Cal Menu.
14. Use AIR to place the cursor next to ESCAPE.
15. Press and release POWER MODE. The instrument returns to the GAS CAL menu.
16. See “Exiting the GAS CAL Menu” on page 90 to return to User Mode.
Making Cylinder Selections in CYL SETTING
The CYL SETTING menu item allows you to group gases together for calibration. As shipped
from the factory, the standard 4 gases (combustible gas, O2, H2S, CO) are assigned to Cylinder A
which means all 4 gases are calibrated at once. As shipped from the factory, the hydrogencompensated CO and toxic gases are assigned to Cylinder D or Cylinder E. There are 5 cylinder
assignments available: A, B, C, D, and E. To calibrate each gas separately, assign each gas to a
different cylinder (ie. Cylinder A: combustible gas, Cylinder B: O2, Cylinder C: H2S, Cylinder D:
CO, Cylinder E: CO2).
1. While in User Mode, use AIR to place the cursor next to GAS CAL.
MAINTE
7:49
BUMP TEST
GAS CAL
CAL SETTING
USER MODE
2. Press and release POWER MODE. The Gas Cal menu appears.
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 5: User Mode and Calibration • 87
3. Use AIR to place the cursor next to AUTO CAL.
MAINTE
7:49
CO2 ZERO CAL
AUTO CAL
ESCAPE
GAS CAL
4. Press and release POWER MODE. The Auto Cal screen for gases assigned to Cylinder A
displays.
5. Use AIR to scroll to CYL SETTING.
MAINTE
7:49
CYL SETTING
6. Press and release POWER MODE. The combustible gas channel displays.
MAINTE
CH4
30
%LEL
----
CYL SETTING
88 • Chapter 5: User Mode and Calibration
GX-3R Pro (TIIS Version) Operator’s Manual
7. Use AIR to scroll to the channel whose cylinder assignment you want to change.
MAINTE
CH4
7:49
MAINTE
%LEL
AIR
----
CYL SETTING
CO
----
CYL SETTING
AIR
MAINTE
O2
7:49
ppm
AIR
7:49
MAINTE
%
7:49
CO2
----
vol%
----
CYL SETTING
CYL SETTING
AIR
MAINTE
AIR
MAINTE
7:49
H2S
7:49
ppm
----
ESCAPE
CYL SETTING
8. Press and release POWER MODE. The current setting flashes. In the example below, the
combustible gas channel is selected.
MAINTE
CH4
7:49
%LEL
A
CYL SETTING
9. Use AIR to change the cylinder assignment. The choices are A, B, C, D, and E.
10. Press and release POWER MODE to save the change. The cylinder assignment stops flashing
and the unit returns to the channel selection screen.
11. Repeat Step 7 through Step 10 for any other channels that need to be changed.
12. Use AIR to place the cursor next to ESCAPE.
13. Press and release POWER MODE. The instrument will return to the CYL SETING menu
item in the Auto Cal Menu.
14. Use AIR to place the cursor next to ESCAPE.
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 5: User Mode and Calibration • 89
15. Press and release POWER MODE to return to the GAS CAL menu.
16. See “Exiting the GAS CAL Menu” on page 90 to return to User Mode.
Exiting the GAS CAL Menu
1. While in the GAS CAL menu, press AIR to scroll to ESCAPE.
2. Press and release POWER MODE. The instrument returns to the GAS CAL menu item in
User Mode.
3. See “Returning to Measuring Mode (START MEASURE)” on page 116 to enter Measuring
Mode.
Setting Calibration Parameters (CAL SETTING)
The CAL SETTING menu item has 5 items: CAL REMINDER, CAL INTERVAL, CAL
EXPIRED, CAL CHECK GAS, and ESCAPE.
1. While in User Mode, use AIR to place the cursor next to CAL SETTING.
MAINTE
7:49
GAS CAL
CAL SETTING
BUMP SETTING
USER MODE
2. Press and release POWER MODE. The CAL SETTING menu appears.
MAINTE
7:49
CAL REMINDER
CAL INTERVAL
CAL EXPIRED
CAL SETTING
CAL REMINDER
ON (factory setting): The GX-3R Pro gives an indication at start up if it is due for calibration. The
type of indication depends on the CAL EXPIRED setting (see page 91).
OFF: The GX-3R Pro does not give an indication at start up if it is due for calibration.
1. While in the CAL SETTING menu, use AIR to place the cursor next to CAL REMINDER.
MAINTE
7:49
CAL REMINDER
CAL INTERVAL
CAL EXPIRED
CAL SETTING
90 • Chapter 5: User Mode and Calibration
GX-3R Pro (TIIS Version) Operator’s Manual
2. Press and release POWER MODE. The current setting flashes.
3. Use AIR to display the desired setting.
4. Press and release POWER MODE to save the setting and return to the CAL SETTING menu.
5. See “ESCAPE” on page 92 to return to User Mode.
CAL INTERVAL
This setting defines the amount of time between calibrations. The time can be set in 1 day
increments. The minimum setting is 1 day and the maximum setting is 1000 days. The factory
setting is 90 days.
1. While in the CAL SETTING menu, use AIR to place the cursor next to CAL INTERVAL.
MAINTE
7:49
CAL REMINDER
CAL INTERVAL
CAL EXPIRED
CAL SETTING
2. Press and release POWER MODE. The current setting flashes.
3. Use AIR to display the desired setting.
4. Press and release POWER MODE to save the setting and return to the CAL SETTING menu.
5. See “ESCAPE” on page 92 to return to User Mode.
CAL EXPIRED
This item defines what indication is given during start up when calibration is due and CAL
REMINDER is set to ON.
CONFIRM TO USE (factory setting): The GX-3R Pro gives an indication at start up if
calibration is past due. Press and release AIR to continue without calibrating or POWER MODE
to perform a calibration.
CANNOT USE: The GX-3R Pro gives an indication at start up if calibration is past due. Press
and release POWER MODE to enter User Mode and perform a calibration. Pressing AIR has no
effect. A successful calibration must be performed in order to use the instrument.
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 5: User Mode and Calibration • 91
NO EFFECT: The GX-3R Pro gives an indication at startup if calibration is past due. If desired,
press POWER MODE to perform a calibration but it is not necessary to acknowledge the
calibration due indication. The warm-up sequence will continue on its own.
1. While in the CAL SETTING menu, use AIR to place the cursor next to CAL EXPIRED.
MAINTE
7:49
CAL INTERVAL
CAL EXPIRED
CAL CHECK GAS
CAL SETTING
2. Press and release POWER MODE. The current setting flashes.
3. Use AIR to display the desired setting.
4. Press and release POWER MODE to save the setting and return to the CAL SETTING menu.
5. See “ESCAPE” on page 92 to return to User Mode.
CAL CHECK GAS
ALL GAS (factory setting): Calibration dates for all gases are used to determine if calibration is
due.
4 GAS: Calibration dates for only the standard 4 gases (combustible gas/O2/H2S/CO) are used to
determine if calibration is due.
1. While in the CAL SETTING menu, use AIR to place the cursor next to CAL CHECK GAS.
MAINTE
7:49
CAL EXPIRED
CAL CHECK GAS
ESCAPE
CAL SETTING
2. Press and release POWER MODE. The current setting flashes.
3. Use AIR to display the desired setting.
4. Press and release POWER MODE to save the setting and return to the CAL SETTING menu.
5. See “ESCAPE” on page 92 to return to User Mode.
ESCAPE
1. While in the CAL SETTING menu, use AIR to place the cursor next to ESCAPE.
2. Press and release POWER MODE. The instrument returns to User Mode.
3. See “Returning to Measuring Mode (START MEASURE)” on page 116 to return to
Measuring Mode.
92 • Chapter 5: User Mode and Calibration
GX-3R Pro (TIIS Version) Operator’s Manual
Setting Bump Test Parameters (BUMP SETTING)
The BUMP SETTING menu item has 6 items: BUMP PARAMETERS, BUMP REMINDER,
BUMP INTERVAL, BUMP EXPIRED, BUMP CHECK GAS, and ESCAPE.
1. While in User Mode, use AIR to place the cursor next to BUMP SETTING.
MAINTE
7:49
CAL SETTING
BUMP SETTING
MAN DOWN
USER MODE
2. Press and release POWER MODE. The BUMP SETTING menu appears.
MAINTE
7:49
BUMP PARAMETER
BUMP REMINDER
BUMP INTERVAL
BUMP SETTING
BUMP PARAMETER
The BUMP PARAMETER menu item has 5 items: GAS TIME, TOLERANCE, CAL TIME,
AUTO CAL, and ESCAPE.
1. While in the BUMP SETTING menu, use AIR to place the cursor next to BUMP
PARAMETER.
MAINTE
7:49
BUMP PARAMETER
BUMP REMINDER
BUMP INTERVAL
BUMP SETTING
2. Press and release POWER MODE. The BUMP PARAMETER menu appears.
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 5: User Mode and Calibration • 93
GAS TIME
The GAS TIME is the amount of time that the instrument is exposed to gas during a bump test.
The available choices are 30 seconds (factory setting), 45 seconds, 60 seconds, and 90 seconds.
1. While in the BUMP SETTING\BUMP PARAMETER menu, use AIR to place the cursor
next to GAS TIME.
MAINTE
7:49
GAS TIME
TOLERANCE
CAL TIME
BUMP PARAMETER
2. Press and release POWER MODE. The current setting flashes.
3. Use AIR to display the desired setting.
4. Press and release POWER MODE to save the setting and return to the BUMP PARAMETER
menu.
5. See “ESCAPE” on page 96 to return to the BUMP SETTING menu.
6. See “ESCAPE” on page 98 to return to User Mode.
TOLERANCE
TOLERANCE is the bump test tolerance value and is represented as a percentage of the
calibration gas concentration. It is the percentage that the bump test reading can differ from the
actual gas concentration. If the bump test reading differs more, the bump test will fail. The
available values are 10%, 20%, 30%, 40%, and 50% (factory setting).
1. While in the BUMP SETTING\BUMP PARAMETER menu, use AIR to place the cursor
next to TOLERANCE.
MAINTE
7:49
GAS TIME
TOLERANCE
CAL TIME
BUMP PARAMETER
2. Press and release POWER MODE. The current setting flashes.
3. Use AIR to display the desired setting.
4. Press and release POWER MODE to save the setting and return to the BUMP PARAMETER
menu.
5. See “ESCAPE” on page 96 to return to the BUMP SETTING menu.
6. See “ESCAPE” on page 98 to return to User Mode.
94 • Chapter 5: User Mode and Calibration
GX-3R Pro (TIIS Version) Operator’s Manual
CAL TIME
The CAL TIME is the total time the instrument is exposed to calibration gas when a bump test
fails if AUTO CAL is set to ON. The bump test time is deducted from the calibration time. For
example, if the CAL TIME is set to 90 seconds and the GAS TIME is set to 30 seconds, if the
bump test fails, the GX-3R Pro will only be exposed to gas for an additional 60 seconds. The
available values are 90 seconds (factory setting), and 120 seconds.
1. While in the BUMP SETTING\BUMP PARAMETER menu, use AIR to place the cursor
next to CAL TIME.
MAINTE
7:49
TOLERANCE
CAL TIME
AUTO CAL
BUMP PARAMETER
2. Press and release POWER MODE. The current setting flashes.
3. Use AIR to display the desired setting.
4. Press and release POWER MODE to save the setting and return to the BUMP PARAMETER
menu.
5. See “ESCAPE” on page 96 to return to the BUMP SETTING menu.
6. See “ESCAPE” on page 98 to return to User Mode.
AUTO CAL
ON (factory setting): If a bump test fails, the unit automatically begins a calibration.
OFF: If a bump test fails, the unit does not automatically begin a calibration.
1. While in the BUMP SETTING\BUMP PARAMETER menu, use AIR to place the cursor
next to AUTO CAL.
MAINTE
7:49
CAL TIME
AUTO CAL
ESCAPE
BUMP PARAMETER
2. Press and release POWER MODE. The current setting flashes.
3. Use AIR to display the desired setting.
4. Press and release POWER MODE to save the setting and return to the BUMP PARAMETER
menu.
5. See “ESCAPE” on page 96 to return to the BUMP SETTING menu.
6. See “ESCAPE” on page 98 to return to User Mode.
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 5: User Mode and Calibration • 95
ESCAPE
1. While in the BUMP SETTING\BUMP PARAMETER menu, use AIR to place the cursor
next to ESCAPE.
MAINTE
7:49
CAL TIME
AUTO CAL
ESCAPE
BUMP PARAMETER
2. Press and release POWER MODE. The instrument returns to the BUMP PARAMETER
menu.
BUMP REMINDER
ON: The GX-3R Pro gives an indication at start up if it is due for bump testing. The type of
indication depends on the BUMP EXPIRED setting (see page 97).
OFF (factory setting): The GX-3R Pro does not give an indication at start up if it is due for bump
testing.
1. While in the BUMP SETTING menu, use AIR to place the cursor next to BUMP
REMINDER.
MAINTE
7:49
BUMP PARAMETER
BUMP REMINDER
BUMP INTERVAL
BUMP SETTING
2. Press and release POWER MODE. The current setting flashes.
3. Use AIR to display the desired setting.
4. Press and release POWER MODE to save the setting and return to the BUMP SETTING
menu.
5. See “ESCAPE” on page 98 to return to User Mode.
96 • Chapter 5: User Mode and Calibration
GX-3R Pro (TIIS Version) Operator’s Manual
BUMP INTERVAL
This setting defines the amount of time between bump tests. The time can be set in 1 day
increments. The minimum setting is 0 days and the maximum setting is 30 days. The factory
setting is 30 days.
1. While in the BUMP SETTING menu, use AIR to place the cursor next to BUMP
INTERVAL.
MAINTE
7:49
BUMP REMINDER
BUMP INTERVAL
BUMP EXPIRED
BUMP SETTING
2. Press and release POWER MODE. The current setting flashes.
3. Use AIR to display the desired setting.
4. Press and release POWER MODE to save the setting and return to the BUMP SETTING
menu.
5. See “ESCAPE” on page 98 to return to User Mode.
BUMP EXPIRED
This item defines what indication is given during start up when a bump test is due and BUMP
REMINDER is set to ON.
CONFIRM TO USE (factory setting): The GX-3R Pro gives an indication at start up if a bump
test is past due. Press and release AIR to continue without bump testing or POWER MODE to
perform a bump test.
CANNOT USE: The GX-3R Pro gives an indication at start up if a bump test is past due. Press
and release POWER MODE to enter User Mode and perform a bump test. Pressing AIR has no
effect. A successful bump test must be performed in order to use the instrument.
NO EFFECT: The GX-3R Pro gives an indication at startup if a bump test is past due. If desired,
press POWER MODE to perform a bump test but it is not necessary to acknowledge the bump
test due indication. The warm-up sequence will continue on its own.
1. While in the BUMP SETTING menu, use AIR to place the cursor next to BUMP
EXPIRED.
MAINTE
7:49
BUMP INTERVAL
BUMP EXPIRED
BUMP CHECK GAS
BUMP SETTING
2. Press and release POWER MODE. The current setting flashes.
3. Use AIR to display the desired setting.
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 5: User Mode and Calibration • 97
4. Press and release POWER MODE to save the setting and return to the BUMP SETTING
menu.
5. See “ESCAPE” on page 101 to return to User Mode.
BUMP CHECK GAS
ALL GAS (factory setting): Bump test dates for all gases are used to determine if bump test is
due.
4 GAS: Bump test dates for only the standard 4 gases (combustible gas/O2/H2S/CO) are used to
determine if bump test is due.
1. While in the BUMP SETTING menu, use AIR to place the cursor next to BUMP CHECK
GAS.
MAINTE
7:49
BUMP EXPIRED
BUMP CHECK GAS
ESCAPE
BUMP SETTING
2. Press and release POWER MODE. The current setting flashes.
3. Use AIR to display the desired setting.
4. Press and release POWER MODE to save the setting and return to the BUMP SETTING
menu.
5. See “ESCAPE” on page 98 to return to User Mode.
ESCAPE
1. While in the BUMP SETTING menu, use AIR to place the cursor next to ESCAPE.
MAINTE
7:49
BUMP EXPIRED
BUMP CHECK GAS
ESCAPE
BUMP SETTING
2. Press and release POWER MODE. The instrument will return to User Mode.
3. See “Returning to Measuring Mode (START MEASURE)” on page 116 to return to
Measuring Mode.
98 • Chapter 5: User Mode and Calibration
GX-3R Pro (TIIS Version) Operator’s Manual
Adjusting Man Down and Panic Settings (MAN
DOWN)
The MAN DOWN menu item has 4 items: MAN DOWN, PANIC, MAN DOWN TIME, and
ESCAPE.
1. While in User Mode, use AIR to place the cursor next to MAN DOWN.
MAINTE
7:49
BUMP SETTING
MAN DOWN
ALARM SETTING
USER MODE
2. Press and release POWER MODE. The MAN DOWN menu appears.
MAINTE
7:49
MAN DOWN
PANIC
MAN DOWN TIME
MAN DOWN MENU
Turning Man Down On/Off
ON: The Man Down alarm is triggered if the instrument detects no motion for the period of time
defined in WARNING 1 TIME, WARNING 2 TIME, and ALARM TIME below.
OFF (factory setting): The Man Down alarm is not triggered.
1. While in the MAN DOWN menu, use AIR to place the cursor next to MAN DOWN.
MAINTE
7:49
MAN DOWN
PANIC
MAN DOWN TIME
MAN DOWN MENU
2. Press and release POWER MODE. The current setting flashes.
3. Use AIR to display the desired setting.
4. Press and release POWER MODE to save the setting and return to the MAN DOWN menu.
5. See “ESCAPE” on page 101 to return to User Mode.
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 5: User Mode and Calibration • 99
Turning Panic On/Off
ON: A Panic Alarm can be initiated by firmly tapping the instrument twice in a row.
OFF (factory setting): A Panic Alarm cannot be initiated.
1. While in the MAN DOWN menu, use AIR to place the cursor next to PANIC.
MAINTE
7:49
MAN DOWN
PANIC
MAN DOWN TIME
MAN DOWN MENU
2. Press and release POWER MODE. The current setting flashes.
3. Use AIR to display the desired setting.
4. Press and release POWER MODE to save the setting and return to the MAN DOWN menu.
5. See “ESCAPE” on page 101 to return to User Mode.
Setting the Man Down Warning/Alarm Times (MAN
DOWN TIME)
The Man Down Warning/Alarm times are the amount of time that has to pass between a Man
Down detection and each warning/alarm. Each time can be set in 1 second increments. The total
Man Down setting range is 10 - 240 seconds.
When setting the Man Down Warning/Alarm times, keep in mind that ALARM TIME
WARNING 2 TIME
WARNING 1 TIME.
Warning/Alarm
Factory Setting
WARNING 1 TIME
60 seconds
WARNING 2 TIME
75 seconds
ALARM TIME
90 seconds
1. While in the MAN DOWN menu, use AIR to place the cursor next to MAN DOWN TIME.
MAINTE
7:49
PANIC
MAN DOWN TIME
ESCAPE
MAN DOWN MENU
100 • Chapter 5: User Mode and Calibration
GX-3R Pro (TIIS Version) Operator’s Manual
2. Press and release POWER MODE. The current WARNING 1 TIME setting flashes.
MAINTE
7:49
MAINTE
60 SEC
7:49
90 SEC
For all settings: WARNING 1 TIME
1) AIR to adjust
2) POWER MODE
to save and
MAINTE 7:49
continue
ALARM TIME
MAINTE
7:49
PANIC
MAN DOWN TIME
ESCAPE
MAN DOWN MENU
75 SEC
WARNING 2 TIME
3. Use AIR to adjust the WARNING 1 TIME.
4. Press and release POWER MODE to save the setting.
5. Repeat Step 3 through Step 4 for the WARNING 2 TIME and ALARM TIME settings.
6. The instrument returns to the MAN DOWN menu.
7. See “ESCAPE” on page 101 to return to User Mode.
ESCAPE
1. While in the MAN DOWN menu, press AIR to scroll to ESCAPE.
2. Press and release POWER MODE. The instrument returns to User Mode.
3. See “Returning to Measuring Mode (START MEASURE)” on page 116 to return to
Measuring Mode.
Alarm Settings (ALARM SETTING)
The ALARM SETTING menu item has 3 items: ALARM SETTING, DEFAULT ALM-P, and
ESCAPE.
1. While in User Mode, use AIR to place the cursor next to ALARM SETTING.
MAINTE
7:49
MAN DOWN
ALARM SETTING
LUNCH BREAK
USER MODE
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 5: User Mode and Calibration • 101
2. Press and release POWER MODE. The first channel displays.
MAINTE
CH4
7:49
%LEL
----
ALARM SETTING
Setting the Alarm Points
1. While in the ALARM SETTING menu, press AIR to scroll to the instrument channel whose
alarm points you want to change.
MAINTE
CO
AIR
MAINTE
CH4
7:49
ppm
----
7:49
%LEL
ALARM SETTING
----
AIR
ALARM SETTING
MAINTE
7:49
AIR
CO2
MAINTE
vol%
----
7:49
ALARM SETTING
O2
%
AIR
---MAINTE
ALARM SETTING
7:49
AIR
MAINTE
7:49
H2S
ppm
----
DEFAULT ALM--P
AIR
ALARM SETTING
MAINTE
7:49
ESCAPE
2. Press and release POWER MODE.
102 • Chapter 5: User Mode and Calibration
GX-3R Pro (TIIS Version) Operator’s Manual
3. The Warning setpoint for the channel flashes. The CO channel is selected in the example
below.
MAINTE
7:49
MAINTE
7:49
CO
ppm
CO
ppm
25
WARNING
200
STEL
MAINTE
7:49
MAINTE
7:49
CO
ppm
CO
ppm
For all settings:
1) AIR to adjust
2) POWER
MODE to save
and continue
50
25
ALARM
TWA
MAINTE
7:49
MAINTE
7:49
CO
ppm
CO
ppm
1200
----
ALARM H
ALARM SETTING
4. Use AIR to adjust the Warning setpoint. Alarm setpoint limitations are shown below.
Channel
Alarm Point Limitations
Combustible Gas
1% LEL
WARNING
O2
• 0.0%
ALARM
• 21.8%
ALARM H
40.0%
H2S
0.5 ppm
WARNING
ALARM
ALARM H
200.0 ppm
CO
12 ppm
WARNING
ALARM
ALARM H
2000 ppm
CO2 10,000 ppm
1,000 ppm
CO2 10% volume
0.20% volume
HCN
0.9 ppm
WARNING
ALARM
ALARM H
30.0 ppm
NH3
8.0 ppm
WARNING
ALARM
ALARM H
400.0 ppm
NO2
0.50 ppm
WARNING
ALARM
ALARM H
20.00 ppm
PH3
0.05 ppm
WARNING
ALARM
ALARM H
20.00 ppm
SO2
0.25 ppm
WARNING
ALARM
ALARM H
100.00 ppm
ALARM
WARNING
WARNING
GX-3R Pro (TIIS Version) Operator’s Manual
ALARM H
20.0%
ALARM
WARNING
60% LEL
ALARM H
ALARM
10,000 ppm
ALARM H
8.00% volume
Chapter 5: User Mode and Calibration • 103
5. Press and release POWER MODE to save the setting.
6. Repeat Step 4 through Step 5 for the Alarm, Alarm H, STEL (CO, H2S, CO2, and super toxic
only) and TWA (CO, H2S, CO2, and super toxic only) settings.
7. The instrument returns to the ALARM SETTING menu.
8. Repeat Step 1 through Step 7 to change the alarm points for other channels.
9. See “ESCAPE” on page 104 to return to User Mode.
Defaulting the Alarm Points
Defaulting the alarm points defaults them back to factory settings as outlined in Table 1 on
page 11 or to the settings saved in the SAVE ALARM-P menu item in Gas Select Mode if you
have performed a SAVE ALARM-P operation.
1. While in the ALARM SETTING menu, press AIR to scroll to DEFAULT ALM--P.
MAINTE
7:49
DEFAULT ALM--P
2. Press POWER MODE to enter the DEFAULT ALM--P menu item.
3. Press POWER MODE to perform an alarm default. Press AIR to return to the DEFAULT
ALM--P menu item.
4. The instrument asks if you’re sure you want to default the alarm points. Press POWER
MODE to default the alarm points. Press AIR to return to the ALARM SETTING menu.
5. See “ESCAPE” on page 104 to return to User Mode.
ESCAPE
1. While in the ALARM SETTING menu, press AIR to scroll to ESCAPE.
2. Press and release POWER MODE. The instrument returns to User Mode.
3. See “Returning to Measuring Mode (START MEASURE)” on page 116 to return to
Measuring Mode.
104 • Chapter 5: User Mode and Calibration
GX-3R Pro (TIIS Version) Operator’s Manual
Updating the Lunch Break Setting (LUNCH BREAK)
OFF (factory setting): The GX-3R Pro automatically starts new TWA and PEAK reading
collection and resets the time in operation at startup.
ON: The Lunch Break Screen displays during startup. From this screen, you can choose to
continue accumulating TWA and PEAK readings and the time in operation from the last time the
GX-3R Pro was used or start collecting new readings and reset the time in operation.
1. While in User Mode, use AIR to place the cursor next to LUNCH BREAK.
MAINTE
7:49
ALARM SETTING
LUNCH BREAK
CONFIRMATION
USER MODE
2. Press and release POWER MODE. The current setting flashes.
3. Use AIR to display the desired setting.
4. Press and release POWER MODE to save the setting and return to User Mode.
5. See “Returning to Measuring Mode (START MEASURE)” on page 116 to return to
Measuring Mode.
Setting the Confirmation Beep and Non-Compliance
Indicator (CONFIRMATION)
The CONFIRMATION menu item has 3 items: BEEP SELECT, BEEP INTERVAL, and
ESCAPE.
1. While in User Mode, use AIR to place the cursor next to CONFIRMATION.
MAINTE
7:49
LUNCH BREAK
CONFIRMATION
AUTO BACKLIGHT
USER MODE
2. Press and release POWER MODE to enter the Confirmation Menu.
MAINTE
7:49
BEEP SELECT
BEEP INTERVAL
ESCAPE
CONFIRMATION
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 5: User Mode and Calibration • 105
BEEP SELECT
BEEP SELECT defines what kind of confirmation or non-compliance indication you want to
occur in Measuring Mode. The available choices are:
OFF (factory setting): The GX-3R Pro does not provide a confirmation alert or non-compliance
indicator.
LED: The GX-3R Pro’s LEDs double flash as often as defined by the BEEP INTERVAL
parameter to verify that the instrument is operating.
BUZZER: The GX-3R Pro’s buzzer double beeps as often as defined by the BEEP INTERVAL
parameter to verify that the instrument is operating.
LED+BUZZER: The GX-3R Pro’s LEDs double flash and the buzzer double beeps as often as
defined by the BEEP INTERVAL parameter to verify that the instrument is operating.
BUMP/CAL: If a bump test or a calibration is due and if BUMP EXPIRED or CAL EXPIRED
is set to CONFIRM TO USE or NO EFFECT, the GX-3R Pro’s LEDs double flash as often as
defined by the BEEP INTERVAL parameter to indicate a non-compliance. Once a successful
bump test or calibration (depending on which is due) is done, the LEDs stop flashing.
ALARM ALERT: If the instrument goes into any gas alarm, the LEDs double flash as often as
defined by the BEEP INTERVAL parameter to indicate a non-compliance. Once a successful
bump test or calibration is done, the LEDs stop flashing.
NOTE: Depending on the Need to get Bump Log setting (only accessed via SDM-3R
program), a data download may also be needed to clear the non-compliance.
BUMP/CAL/ALARM: The LEDs double flash to indicate a non-compliance if any of the
following happens.
a. BUMP EXPIRED is set to CONFIRM TO USE or NO EFFECT and a bump test is
due (cleared by successful bump test).
b. CAL EXPIRED is set to CONFIRM TO USE or NO EFFECT and a calibration is due
(cleared by successful calibration).
c. The instrument goes into any gas alarm (cleared by successful bump test or calibration).
NOTE: Depending on the Need to get Bump Log setting (only accessed via SDM-3R
program), a data download may also be needed to clear the gas alarm non-compliance.
1. While in the CONFIRMATION menu, use AIR to place the cursor next to BEEP SELECT.
MAINTE
7:49
BEEP SELECT
BEEP INTERVAL
ESCAPE
CONFIRMATION
2. Press and release POWER MODE. The current setting flashes.
3. Use AIR to display the desired setting.
106 • Chapter 5: User Mode and Calibration
GX-3R Pro (TIIS Version) Operator’s Manual
4. Press and release POWER MODE to save the setting and return to the Confirmation Menu.
5. See “ESCAPE” on page 107 to return to User Mode.
BEEP INTERVAL
The BEEP INTERVAL parameter defines how often the confirmation alert or non-compliance
indicator selected in BEEP SELECT occurs. This setting only applies if the BEEP SELECT
parameter is set to something other than OFF. The available choices are 0.5 minutes and 1-99
minutes in 1 minute increments. The factory setting is 5 minutes.
1. While in the CONFIRMATION menu, use AIR to place the cursor next to BEEP
INTERVAL.
MAINTE
7:49
BEEP SELECT
BEEP INTERVAL
ESCAPE
CONFIRMATION
2. Press and release POWER MODE. The current setting flashes.
3. Use AIR to display the desired setting.
4. Press and release POWER MODE to save the setting and return to the Confirmation Menu.
5. See “ESCAPE” on page 107 to return to User Mode.
ESCAPE
1. While in the CONFIRMATION menu, use AIR to place the cursor next to ESCAPE.
2. Press and release POWER MODE. The instrument returns to User Mode.
3. See “Returning to Measuring Mode (START MEASURE)” on page 116 to return to
Measuring Mode.
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 5: User Mode and Calibration • 107
Auto Backlight in Low Light (AUTO BACKLIGHT)
The GX-3R Pro has a luminescence sensor that allows the instrument to detect how bright an
environment is.
ON (factory setting): The instrument’s backlight automatically turns on in a low light
environment.
OFF: The instrument’s backlight does not automatically turn on in a low light environment.
1. While in User Mode, use AIR to place the cursor next to AUTO BACKLIGHT.
MAINTE
7:49
CONFIRMATION
AUTO BACKLIGHT
BACKLIGHT TIME
USER MODE
2. Press and release POWER MODE. The current setting flashes.
3. Use AIR to display the desired setting.
4. Press and release POWER MODE to save the setting and return to User Mode.
5. See “Returning to Measuring Mode (START MEASURE)” on page 116 to return to
Measuring Mode.
Updating the Backlight Time (BACKLIGHT TIME)
This setting defines how long the LCD backlight stays on when you press any button. The
minimum setting is OFF; the maximum setting is 255 seconds. The factory setting is 30 seconds.
1. While in User Mode, use AIR to place the cursor next to BACKLIGHT TIME.
MAINTE
7:49
AUTO BACKLIGHT
BACKLIGHT TIME
KEY TONE
USER MODE
2. Press and release POWER MODE. The current setting flashes.
3. Use AIR to display the desired setting.
4. Press and release POWER MODE to save the setting and return to User Mode.
5. See “Returning to Measuring Mode (START MEASURE)” on page 116 to return to
Measuring Mode.
108 • Chapter 5: User Mode and Calibration
GX-3R Pro (TIIS Version) Operator’s Manual
Turning the Key Tone On/Off (KEY TONE)
ON (factory setting): The instrument will beep when a button is pressed.
OFF: The instrument will not beep when a button is pressed.
1. While in User Mode, use AIR to place the cursor next to KEY TONE.
MAINTE
7:49
BACKLIGHT TIME
KEY TONE
D MODE SETTING
USER MODE
2. Press and release POWER MODE. The current setting flashes.
3. Use AIR to display the desired setting.
4. Press and release POWER MODE to save the setting and return to User Mode.
5. See “Returning to Measuring Mode (START MEASURE)” on page 116 to return to
Measuring Mode.
Display Mode Items (D MODE SETTING)
OFF: HC GAS LIST, USER ID, STATION ID, INVERT SELECT, LCD BACKGROUND,
BLUETOOTH, BUZZER VOLUME, and LANGUAGE items do not appear in Display Mode.
ON (factory setting): HC GAS LIST, INVERT SELECT, LCD BACKGROUND,
BLUETOOTH, BUZZER VOLUME, and LANGUAGE items appear in Display Mode. USER
ID and STATION ID screens appear in Display Mode if ID DISPLAY in Maintenance Mode is
also set to ON (factory setting is OFF).
1. While in User Mode, use AIR to place the cursor next to D MODE SETTING.
MAINTE
7:49
KEY TONE
D MODE SETTING
IR UNIT SELECT
USER MODE
2. Press and release POWER MODE. The current setting flashes.
3. Use AIR to display the desired setting.
4. Press and release POWER MODE to save the setting and return to User Mode.
5. See “Returning to Measuring Mode (START MEASURE)” on page 116 to return to
Measuring Mode.
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 5: User Mode and Calibration • 109
Turning Zero Suppression On/Off (ZERO SUPPRESS)
This menu item only appears if DISP ZERO SUP is set to ON in Maintenance Mode.
The ZERO SUPPRESS setting is not intended for field adjustment. The default setting for each
sensor is ON.
Sensor
Zero
Suppression
Value
Combustible Gas
2% LEL
O2
0.5% volume
H2S
0.3 ppm
CO
2 ppm
CO2
0 ppm
HCN
0.5 ppm
NH3
4 ppm
NO2
0.30 ppm
PH3
0.02 ppm
SO2
0.20 ppm
Turning Zero Follower On/Off (ZERO FOLLOWER)
This menu item only appears if DISP ZERO FLWR is set to ON in Maintenance Mode.
The ZERO FOLLOWER setting is not intended for field adjustment. The oxygen channel does
not support zero follower functionality. The default setting is ON for all other channels.
110 • Chapter 5: User Mode and Calibration
GX-3R Pro (TIIS Version) Operator’s Manual
Reading Units for IR Sensor (IR UNIT SELECT)
This menu item only appears if a CO2 sensor is installed. IR UNIT SELECT changes the IR
sensor’s units.
vol%: CO2 readings displayed in percent volume
ppm: CO2 readings displayed in parts per million
1. While in User Mode, use AIR to place the cursor next to IR UNIT SELECT.
MAINTE
7:49
D MODE SETTING
IR UNIT SELECT
CO2AIR SETTING
USER MODE
2. Press and release POWER MODE. The current setting flashes.
3. Use AIR to display the desired setting.
4. Press and release POWER MODE to save the setting and return to User Mode.
5. See “Returning to Measuring Mode (START MEASURE)” on page 116 to return to
Measuring Mode.
CO2 Fresh Air Adjustment On/Off (CO2AIR SETTING)
This menu item only appears if a CO2 sensor is installed.
ON: CO2 channel is set to 400 ppm (0.04% volume) during a demand zero, auto zero, or AIR
CAL.
OFF (factory setting): CO2 channel is not adjusted during a demand zero, auto zero, or AIR
CAL.
1. While in User Mode, use AIR to place the cursor next to CO2AIR SETTING.
MAINTE
7:49
IR UNIT SELECT
CO2AIR SETTING
DATE
USER MODE
2. Press and release POWER MODE. The current setting flashes.
3. Use AIR to display the desired setting.
4. Press and release POWER MODE to save the setting and return to User Mode.
5. See “Returning to Measuring Mode (START MEASURE)” on page 116 to return to
Measuring Mode.
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 5: User Mode and Calibration • 111
Setting the Date/Time (DATE)
1. From the main menu, use AIR to place the cursor next to DATE.
MAINTE
7:49
CO2AIR SETTING
DATE
DATE FORMAT
USER MODE
2. Press and release POWER MODE. The date and time display with the year flashing.
MAINTE
7:49
MM/DD/YYYY
1/14/2019
7:49
DATE
3. Use AIR to display the desired year.
4. Press and release POWER MODE to save the setting. The month setting flashes.
5. Repeat Step 3 through Step 4 to enter the month, day, hours, and minutes settings. The date
and time are saved and the instrument returns to User Mode.
6. See “Returning to Measuring Mode (START MEASURE)” on page 116 to return to
Measuring Mode.
Setting the Date Format (DATE FORMAT)
MM/DD/YYYY (factory setting): month/day/year.
YYYY/MM/DD: year, month, day.
DD/MM/YYYY: day, month, year.
1. While in User Mode, use AIR to place the cursor next to DATE FORMAT.
MAINTE
7:49
DATE
DATE FORMAT
LANGUAGE
USER MODE
2. Press and release POWER MODE. The current setting flashes.
3. Use AIR to display the desired setting.
4. Press and release POWER MODE to save the setting and return to User Mode.
112 • Chapter 5: User Mode and Calibration
GX-3R Pro (TIIS Version) Operator’s Manual
5. See “Returning to Measuring Mode (START MEASURE)” on page 116 to return to
Measuring Mode.
Changing the Instrument Language (LANGUAGE)
The available languages for the GX-3R Pro are: English (factory setting), Japanese, Italian,
Spanish, German, French, Portuguese, Russian, Korean, and Chinese (TC).
If you change the language to anything other than English, the LANGUAGE screen appears in
Display Mode, allowing you to change the instrument language back to English.
1. While in User Mode, use AIR to place the cursor next to LANGUAGE.
MAINTE
7:49
DATE FORMAT
LANGUAGE
USER PASSWORD
USER MODE
2. Press and release POWER MODE. The current setting flashes.
3. Use AIR to display the desired setting.
4. Press and release POWER MODE to save the setting and return to User Mode.
5. See “Returning to Measuring Mode (START MEASURE)” on page 116 to return to
Measuring Mode.
Turning the Password On/Off (USER PASSWORD)
ON: The GX-3R Pro prompts you for a password when you enter User Mode. The factory-set
password is 0405 but it can be changed as desired.
OFF (factory setting): No password is required to enter User Mode.
1. While in User Mode, use AIR to place the cursor next to USER PASSWORD.
MAINTE
7:49
LANGUAGE
USER PASSWORD
ROM / SUM
USER MODE
2. Press and release POWER MODE. The current setting flashes.
3. Use AIR to display the desired setting.
4. If you selected OFF, press and release POWER MODE to save the setting and return to the
USER PASSWORD item in User Mode.
If you selected ON, continue with Step 5.
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 5: User Mode and Calibration • 113
5. Press and release POWER MODE. The Set Password Screen appears. The current password
displays and the first digit flashes.
MAINTE
7:49
0405
USER PASSWORD
6. Use AIR to display a number from 0 to 9.
7. Press and release POWER MODE to enter the selection and advance to the next number. To
go back a number, press and hold AIR and POWER MODE for a few seconds.
8. Repeat Step 6 and Step 7 to select the remaining numbers. When you press and release
POWER MODE to enter the last number, the password is saved and you return to User Mode.
9. See “Returning to Measuring Mode (START MEASURE)” on page 116 to return to
Measuring Mode.
Viewing the ROM/SUM (ROM/SUM)
The ROM/SUM screen shows the instruments’ firmware version and firmware checksum.
1. While in User Mode, use AIR to place the cursor next to ROM/SUM.
MAINTE
7:49
USER PASSWORD
ROM / SUM
RADIO STANDARD
USER MODE
114 • Chapter 5: User Mode and Calibration
GX-3R Pro (TIIS Version) Operator’s Manual
2. Press and release POWER MODE. The screen cycles through the main board’s ROM/SUM,
the sensor board’s ROM/SUM, the IR sensor ROM/SUM (if an IR sensor is installed), and the
Bluetooth version. The ROM is the top value and the SUM is the bottom value.
MAINTE
MAINTE
7:49
05672
8EAC
ROM/SUM IR SENS
35708
BAB8
ROM/SUM MAIN
MAINTE
7:49
7:49
MAINTE
35707
C1E3
ROM/SUM SENSOR
7:49
00.00.21
BLUETOOTH
3. Press and release POWER MODE to return to User Mode.
4. See “Returning to Measuring Mode (START MEASURE)” on page 116 to return to
Measuring Mode.
Viewing the Radio Standards (RADIO STANDARD)
1. While in User Mode, use AIR to place the cursor next to RADIO STANDARD.
MAINTE
7:49
ROM / SUM
RADIO STANDARD
START MEASURE
USER MODE
2. Press and release POWER MODE. The radio standards display.
MAINTE
7:49
Contains IC: 4389B-EYSHJN
Contains FCC ID: RYYEYSHJN
RADIO STANDARD
3. Press and release POWER MODE to return to User Mode.
4. See “Returning to Measuring Mode (START MEASURE)” on page 116 to return to
Measuring Mode.
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 5: User Mode and Calibration • 115
Returning to Measuring Mode (START MEASURE)
1. While in User Mode, use AIR to place the cursor next to START MEASURE.
MAINTE
7:49
ROM / SUM
RADIO STANDARD
START MEASURE
USER MODE
2. Press and release POWER MODE.
3. The instrument begins its start-up sequence.
116 • Chapter 5: User Mode and Calibration
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 6: Maintenance
Overview
This chapter describes troubleshooting procedures for the GX-3R Pro. It also includes procedures
for instrument cleaning, replacing and recharging the batteries, and replacing various consumable
parts.
WARNING: RKI Instruments, Inc. recommends that service, calibration, and repair of RKI
instruments be performed by personnel properly trained for this work. Replacing
sensors and other parts with original equipment does not affect the intrinsic
safety of the instrument.
Troubleshooting
The troubleshooting table describes error messages, symptoms, probable causes, and
recommended action for problems you may encounter with the GX-3R Pro.
Symptoms
Probable Causes
Recommended Action
• The LCD is blank.
• The unit may have been
turned off.
1. To turn on the unit, press and briefly
hold POWER MODE.
2. If the unit does not turn on, replace
or recharge the batteries.
3. If the difficulties continue, contact
RKI Instruments, Inc. for further
instruction.
• The batteries may need to be
replaced or recharged.
• The LCD shows
abnormally high or
low readings but
other gas detection
instruments do not.
• One of the sensor’s filters
may need to be replaced.
• The GX-3R Pro may need to
be recalibrated.
• The sensor for the affected
channel(s) may need
replacement.
GX-3R Pro (TIIS Version) Operator’s Manual
1. Replace the sensor filter.
2. Recalibrate the unit.
3. If the difficulties continue, replace
the sensor for the affected
channel(s) and calibrate the affected
channel(s).
4. Allow instruments with NH3
sensors 2 hours of sensor warmup
prior to operation if the sensor or
batteries are newly installed or if the
unit’s batteries have been
completely discharged
5. If the difficulties continue, contact
RKI Instruments, Inc. for further
instruction.
Chapter 6: Maintenance • 117
Symptoms
Probable Causes
Recommended Action
• Calibration fails.
• The calibration values may
not match the cylinder gas
concentrations.
1. Make sure the GX-3R Pro has been
properly set up for calibration.
2. Change the charcoal filter or dual
filter.
3. Check all calibration tubing for
leaks or for any bad connections.
4. Verify that the calibration cylinder
contains an adequate supply of fresh
test sample.
5. If the fail condition continues,
replace the sensor(s).
6. If the difficulties continue, contact
RKI Instruments, Inc. for further
instruction.
• The charcoal filter or
charcoal half of the dual filter
is saturated causing an
elevated CO reading.
• The sample gas is not
reaching the sensors because
of a bad connection.
• The calibration cylinder may
be out of gas or is outdated.
• The sensor for the affected
channel(s) may need
replacement.
• Heart symbol at the
top of the screen
becomes steadily on
or disappears
• A microprocessor error has
occurred.
• Contact RKI Instruments, Inc. for
further instruction.
• Charge LED
alternates between
green and orange
• Charging environment is
outside the allowed 0 - 40°C
charging temperature range.
• Move the charger to a location that is
within the allowed 0 - 40°C charging
temperature range.
Instrument Cleaning
Clean the GX-3R Pro with a cloth dampened with water if it becomes excessively dirty. Do not
use alcohol or other cleaning solvents.
Replacing the Batteries (Alkaline Version)
NOTE: Use Toshiba LR03 alkaline batteries or RKI Instruments, Inc. lithium-ion battery pack
49-1625 to maintain the TIIS classification of the GX-3R Pro. Use of other batteries will
void the TIIS classification and may void the warranty. Do not mix old/new or different
types of batteries.
CAUTION: Sensors, filters, and alkaline batteries are the only user-serviceable parts in the GX3R Pro. Do not replace or modify any other part.
118 • Chapter 6: Maintenance
GX-3R Pro (TIIS Version) Operator’s Manual
WARNING: To prevent ignition of a hazardous atmosphere, batteries must only be changed in
an area known to be nonhazardous.
NOTE: If old batteries are completely out of charge (the unit does not power on), instruments
with NH3 sensors require 2 hours for sensor warmup before turning the instrument on
for normal operation.
Replace the 2 AAA batteries when the battery icon indicates that the unit is in low battery
warning. When in low battery warning, the lowest battery level indication bar disappears and the
battery icon will be flashing.
1. Turn off the GX-3R Pro.
WARNING: Do not remove the batteries while the GX-3R Pro is on.
2. Use a coin or a screwdriver to turn the battery cover counterclockwise.
3. Carefully remove the old alkaline batteries. Verify that the battery compartment and electrical
contacts are clean.
4. Carefully install the 2 new AAA alkaline batteries according to the battery diagram inside the
battery compartment. Be sure the batteries are installed in the correct orientation.
Figure 12: Installing the Alkaline Batteries
5. Use a coin or a screwdriver to turn the battery cover clockwise.
6. Turn on the GX-3R Pro and confirm that it starts up.
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 6: Maintenance • 119
Recharging the Batteries (Li-ion Version)
WARNING: Do not charge batteries in a hazardous location. Do not charge the unit with a
non-genuine charger. Charge only with RKI charger p/n 49-0133 or 49-0134.
Use of other chargers will void the warranty.
NOTE: If old batteries have been completely discharged (the unit does not power on),
instruments with NH3 sensors require 2 hours for sensor warmup before turning the
instrument on for normal operation.
Recharge the batteries when the battery icon indicates that the unit is in low battery warning.
When in low battery warning, the lowest battery level indication bar disappears and the battery
icon flashes.
1. Make sure the GX-3R Pro is off.
2. Plug the AC adapter into an electrical outlet.
3. Plug the charging jack straight into the GX-3R Pro’s charging socket from the top. When
properly connected, a green LED turns on at the top of the GX-3R Pro.
OR
Figure 13: Connecting the Charging Cable
4. The LED at the top of the GX-3R turns orange while charging. When a full charge has been
reached, approximately 3 hours, the LED turns green.
120 • Chapter 6: Maintenance
GX-3R Pro (TIIS Version) Operator’s Manual
5. Pull the charging jack straight out of the GX-3R Pro’s charging socket.
OR
Figure 14: Removing the Charging Cable
6. Turn on the GX-3R Pro and confirm that it starts up.
Replacing the Buzzer Cover
The buzzer cover may need to be replaced if it becomes saturated or clogged with particles.
1. Remove the rubber boot from the GX-3R Pro.
2. Peel off the old buzzer cover located between the AIR and POWER MODE buttons.
3. If necessary, remove any remaining residue from the case.
4. Peel the backing off of the new buzzer cover.
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 6: Maintenance • 121
5. Install the new buzzer cover between the AIR and POWER MODE buttons as shown below.
Figure 15: Buzzer Cover Replacement
6. Reinstall the rubber boot.
Replacing the Sensor Filters
CAUTION: The buzzer cover, sensors, filters, and alkaline batteries are the only userserviceable parts in the GX-3R Pro. Do not replace or modify any other part.
Combustible Gas Sensor Filter
The H2S filter disk is dark red in color and although it may darken over time, its color is not
indicative of remaining filter life. The H2S filter disk can absorb H2S for 33 ppm hours and
should be replaced after that much exposure. With this many ppm hours of absorption, the H2S
filter disk should be replaced after 80 minutes of exposure to 25 ppm H2S. This equates to
replacing the H2S filter disk after 40 2-minute calibrations with a cylinder containing 25 ppm
H2S. If H2S exists in the monitoring environment, the H2S filter disk will have to be replaced
more frequently.
Dual CO/H2S Sensor Filter
The dual CO/H2S sensor has a half black/half white filter installed over it. The filter should be
replaced if you notice either 1) unexplained CO readings or 2) For users with a 1 ppm H2S alarm
point: a drift on the H2S channel’s zero reading, unexplained H2S readings, the filter appears dirty,
or every 6 months (whichever is sooner).
CO-Only Sensor Filter
A black charcoal filter is installed over CO-only sensors. The filter should be replaced if you
notice unexplained CO readings.
122 • Chapter 6: Maintenance
GX-3R Pro (TIIS Version) Operator’s Manual
H2S-Only and PH3 Sensors’ Filter
A white humidity filter is installed over H2S-only and PH3 sensors. The filter absorbs humidity in
the sampling environment to prevent unstable readings around 0 ppm. “H2S” and “NH3” are
printed on the side of the filter.
• H2S: For users with a 1 ppm H2S alarm setpoint, the filter should be replaced if you
notice: a drift on the H2S channel’s zero reading, unexplained H2S readings, the filter
appears dirty, or every 6 months (whichever is sooner). For users with a 2 ppm or higher
H2S alarm setpoint, the filter does not necessarily ever need to be replaced.
• PH3: The filter should be replaced every 6 months.
NO2 and SO2 Sensors’ Filter
The H2S filter disk is tan in color. The filter should be replaced every 6 months. "NO2" is printed
on the side of the filter intended for use with NO2 sensors. "SO2" is printed on the side of the filter
intended for use with SO2 sensors.
HCN Sensor Filter
The H2S filter disk is dark gray in color. The filter should be replaced every 6 months.
NH3 Sensor Filter
The humidity filter is white in color. The filter should be replaced every 6 months. “NH3” is
printed on the side of the filter.
Replacement Procedure
1. Verify that the GX-3R Pro is off.
2. Turn the GX-3R Pro upside down.
3. Use a small Phillips screwdriver to unscrew the two screws holding the bottom cover to the
rest of the GX-3R Pro’s case. Only unscrew them until the heads are flush with the edge of the
bottom cover.
4. Using a small flat blade screwdriver, gently pry each side of the bottom cover away from the
rest of the GX-3R Pro’s case.
5. Remove the bottom cover from the rest of the GX-3R Pro’s case.
6. Remove the filter gasket/sensor retainer assembly.
7. Remove the filter gasket/hydrophobic dust filter assembly.
8. Gently pry out the filter you want to replace.
9. Install the new filters.
a. Dark red H2S scrubber disk for combustible gas sensor: The brown side of the filter case
should face toward the GX-3R Pro.
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 6: Maintenance • 123
b. Black and white combo filter for CO/H2S dual sensor: The red side of the filter case
should face toward the GX-3R Pro. The black filter material should face the edge of the
GX-3R Pro while the white filter material should face the H2S scrubber disk.
c. Black filter for CO-only sensor: The red side of the filter case should face toward the GX3R Pro.
d. White filter for H2S-only, NH3, and PH3 sensors: The white side of the filter case should
face toward the GX-3R Pro. “H2S” and “PH3” are printed on the side of the filter
intended for use with the H2S-only and PH3 sensors. “NH3” is printed on the side of the
filter intended for use with the NH3 sensor.
e. Tan H2S scrubber disk for NO2 and SO2 sensors: The white side of the filter case should
face toward the GX-3R Pro. "NO2" is printed on the side of the filter intended for use
with NO2 sensors. "SO2" is printed on the side of the filter intended for use with SO2
sensors.
f. Dark gray H2S scrubber disk for HCN sensor: The white side of the filter case should face
toward the GX-3R Pro.
Bottom Cover
Filter Gasket/Hydrophobic Dust
Filter Assembly,
gasket tabs on opposite side of this view
Toxic Sensor
Filter, See
Table
LEL Sensor Filter
Toxic Sensor Filter, See Table
CO/H2S
NOTE: All filters installed black-side-up.
LEL
O2 TOXIC
GX-3R Pro
PO WER
MODE
AIR
Toxic Sensor Filters
Black
Filter
Material
For CO-only
sensor
White
Filter
For dual
Material
CO/H2S sensor
Sensor
Retainer
Side View
For H2S-only,
NH3, and PH3
sensors
Top View
For HCN sensor
For NO2 and
SO2 sensors
Black
Filter
Material
White
Filter
Material
"H2S/PH3" or "NH3"
printed on side
Dark Gray
Filter
Material
Tan
Filter
Material
"NO2" or "SO2"
printed on side
Figure 16: Replacing the Sensor Filters
124 • Chapter 6: Maintenance
GX-3R Pro (TIIS Version) Operator’s Manual
10. Reinstall the filter gasket/hydrophobic dust filter assembly onto the sensor retainer. The
gasket tabs face down.
11. Reinstall the sensor retainer over the sensors.
12. Reattach the bottom cover to the GX-3R Pro. Push it onto the GX-3R Pro until it snaps into
place.
13. Reinstall the two screws that were loosened in Step 3. Tighten the screws to at least 10 Ncm.
14. Bump test the GX-3R Pro as described on page 68 to confirm good operation.
Replacing the Hydrophobic Dust Filter
Some GX-3R Pros have a hydrophobic dust filter that is not attached to the filter gasket. When
replacing the hydrophobic dust filter on one of these GX-3R Pros, remove the filter and the gasket
and replace it with a filter gasket/hydrophobic dust filter assembly.
1. Verify that the GX-3R Pro is off.
2. Turn the GX-3R Pro upside down.
3. Use a small Phillips screwdriver to unscrew the two screws holding the bottom cover to the
rest of the GX-3R Pro’s case. Only unscrew them until the heads are flush with the edge of the
bottom cover.
4. Using a small flat blade screwdriver, gently pry each side of the bottom cover away from the
rest of the GX-3R Pro’s case.
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 6: Maintenance • 125
5. Remove the filter gasket/hydrophobic dust filter assembly.
6. Install the new filter gasket/hydrophobic dust filter assembly with the gasket tabs facing
down.
Bottom Cover
Filter Gasket/Hydrophobic Dust
Filter Assembly,
gasket tabs on opposite side of this view
CO/H2S
LEL
O2 TOXIC
GX-3R Pro
POWER
MODE
AIR
Sensor
Retainer
Side View
Top View
Figure 17: Replacing the Hydrophobic Dust Filter
7. Reattach the bottom cover to the GX-3R Pro. Push it onto the GX-3R Pro until it snaps into
place.
126 • Chapter 6: Maintenance
GX-3R Pro (TIIS Version) Operator’s Manual
8. Reinstall the two screws that were loosened in Step 3. Tighten the screws to at least 10 Ncm.
Replacing a Sensor
CAUTION: The CO, H2S, and super toxic sensors contain an electrolyte solution. If contact
with the electrolyte occurs, wash the area immediately.
CAUTION: The buzzer cover, sensors, filters, and alkaline batteries are the only userserviceable parts in the GX-3R Pro. Do not replace or modify any other part.
1. Verify that the GX-3R Pro is off.
2. Turn the GX-3R Pro upside down.
3. Use a small Phillips screwdriver to unscrew the two screws holding the bottom cover to the
rest of the GX-3R Pro’s case. Only unscrew them until the heads are flush with the edge of the
bottom cover.
4. Using a small flat blade screwdriver, gently pry each side of the bottom cover away from the
rest of the GX-3R Pro’s case.
5. Remove the filter gasket/sensor retainer assembly from the GX-3R Pro. The sensors will be
exposed.
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 6: Maintenance • 127
6. Locate the sensor you want to replace and remove it from its socket.
7. Carefully insert the replacement sensor in the correct socket. Be sure that the new sensor is
installed in the same position as the old sensor and that it is aligned correctly. The toxic and
oxygen sensors have slots to orient the sensor. The combustible gas sensor has tabs to orient
the sensor. Do not force a sensor into its slot.
Bottom Cov er
Filter Gasket/Hydrophobic Dust
Filter A ssem bly,
gasket tabs on opposite side of this v iew
Tox ic S ensor
Filter, See
Table
LEL S ensor Filter
Tox ic S ensor Filter, S ee Table
NOTE: All filters installed black-side-up.
Oxygen Sensor
Tox ic S ensor
Com bustible Gas Sensor
Tox ic S ensor
CO/H2S
LEL
O2 TOXIC
GX-3R Pr o
O2
POWER
MODE
AIR
Tox ic S ensor Filters
Blac k
Filter
Material
For CO-only
sensor
W hite
Filt er
For dual
Material
CO/H2S sensor
Sensor
Retainer
Side View
For H2S-only,
NH3, a nd PH3
sensors
Top View
For HCN sensor
For NO2 a nd
SO2 s ensors
Blac k
Filter
Material
W hite
Filter
Material
"H2S/PH3" o r " NH3"
printed on side
Dark Gray
Filter
Material
Tan
Filter
Material
"NO2" or "SO2"
printed on side
Figure 18: Replacing a Sensor
8. If your instrument has a factory-installed dummy sensor, ensure that it is still installed
correctly. Make sure that the flat side is facing up, away from the GX-3R Pro.
9. Reinstall the filter gasket/sensor retainer assembly. The black and white filter goes over the
CO/H2S sensor with the black half of the filter facing the edge of the GX-3R Pro. Be sure the
filter gasket/sensor retainer is oriented correctly.
128 • Chapter 6: Maintenance
GX-3R Pro (TIIS Version) Operator’s Manual
10. If the filter gasket/hydrophobic dust filter came out, reinstall it with the gasket tabs facing
down.
11. Reattach the bottom cover to the GX-3R Pro. Push it onto the GX-3R Pro until it snaps into
place.
12. Reinstall the two screws that were loosened in Step 3. Tighten the screws to at least 10 Ncm.
NOTE: Instruments with newly installed NH3 sensors require 2 hours for sensor
warmup before initial calibration.
13. Calibrate the new sensors as described in “Chapter 5: User Mode and Calibration” on page 61.
If a new H2-compensated CO sensor was installed, you need to calibrate with CO and set the
H2 response.
Replacing the Battery Board
Replace the battery board when the GX-3R Pro doesn’t hold a charge anymore.
1. Verify that the GX-3R Pro is off.
2. Remove the rubber boot, if installed.
3. Place the GX-3R Pro LCD-side-down.
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 6: Maintenance • 129
4. Unscrew the 4 screws that hold the two case halves together. The alligator or belt clip does not
need to be removed.
Figure 19: Removing Case Screws
5. Separate the two case halves. You may need to pry them apart.
6. The rear half of the case has the battery board.
7. Unscrew the 3 screws that hold the battery board and plastic spacer.
Figure 20: Removing Battery Board Screws
130 • Chapter 6: Maintenance
GX-3R Pro (TIIS Version) Operator’s Manual
8. Gently remove the spacer and the battery board. A black rectangular gasket may come out
with the battery board.
Rear Case
Battery Board
Black Plastic Spacer
Figure 21: Removing the Battery Board
9. Place the black rectangular gasket flat in the rear case.
10. Place the new battery board battery-side-down in the rear case. The case has protrusions that
fit in holes on the battery board.
11. Place the plastic spacer over the battery board.
Side View
Top View
Battery Board
Rear Case
Black Plastic Spacer
Figure 22: Reinstalling the Battery Board
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 6: Maintenance • 131
12. Secure the battery board and spacer using the screws removed in Step 7.
Figure 23: Reinstalling Battery Board Screws
13. Be sure the gasket along the edge of the rear case is seated correctly. The flat side of the gasket
faces away from the case.
Gasket, flat-side-up
Figure 24: Reinstalling Battery Board Screws
14. Reinstall the rear case to the front case using the screws removed in Step 7.
Figure 25: Reinstalling Case Screws
132 • Chapter 6: Maintenance
GX-3R Pro (TIIS Version) Operator’s Manual
15. Reinstall the rubber boot, if being used.
NOTE: Instruments with NH3 sensors require 2 hours for sensor warmup before
turning the instrument on for normal operation.
16. Turn on the GX-3R Pro.
17. If the instruments goes into a clock failure, set the date/time as described on page 112.
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 6: Maintenance • 133
Chapter 7: Storage and Disposal
Storage
• Store away from direct sunlight
• Store in a location with normal temperature and humidity
• Store in a location free of gases, solvents, and vapors
• Store away from dust and dirt
• The instrument must always be stored with a battery pack that is either fully charged (Li-ion
version) or has fresh batteries installed (alkaline version). The sensors use a small amount of
power even when the instrument is turned off. It is important to replace or recharge the
batteries every 6 months during storage.
• If batteries have been completely drained (the unit does not power on), instruments with
NH3 sensors require 2 hours for sensor warmup before turning the instrument on for
normal operation.
• If a GX-3R Pro completely loses power during storage, the date/time must be reset as
described on page 112.
Alkaline
Pack
Li-ion Pack
Fully charged
3 years
2 years
Low battery
alarm
2 years
1 week
• To store a Li-ion battery pack by itself, discharge the battery to 1 bar in the battery icon and
then remove it from the GX-3R Pro.
• To store an alkaline pack by itself, remove the batteries.
Disposal
• Remove the batteries
• Dispose in accordance with local regulations
134 • Chapter 7: Storage and Disposal
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 8: General Parts List
Table 12: General Parts List
Part Number
Description
06-1248RK-03
Calibration kit tubing, 3 foot length
10-1083
Screw for belt clip
10-1086
Screw with flat and lock washers, for alligator clip
10-1087
Screw, for bottom cover and for battery pack
13-0112RK
Wrist strap
13-0124
Alligator clip with 3 installation screws
13-0125
Belt clip with 3 installation screws
20-0335
Rubber boot, black
20-0336
Heat-resistant case
20-0337
Leather case
21-1950
Screen protector
21-1960
Bottom cover
21-1961
Sensor retainer
33-0184
Filter gasket/hydrophobic dust filter assembly, 1 set (to replace hydrophobic dust filters that are separate from the filter gasket and to replace filter gasket/hydrophobic
dust filter assemblies)
33-0184-10
Filter gasket/hydrophobic dust filter assembly, 10 sets (to replace hydrophobic dust
filters that are separate from the filter gasket and to replace filter gasket/hydrophobic
dust filter assemblies)
33-0554
Buzzer cover
33-7130
Charcoal filter /humidity filter disk (black and white), for dual CO/H2S sensor, 5 pack
33-7131
H2S scrubber disk (dark red), for combustible gas sensor, 5 pack
33-7132
Charcoal filter disk (black), for CO and H2-compensated CO sensors, 5 pack
33-7133
Humidity filter (white), for H2S and PH3 sensors, 5 pack
33-7134
H2S scrubber disk (tan), for NO2 sensors, 5 pack
33-7137
H2S scrubber disk (dark gray), for HCN sensor
33-7140
Humidity filter (white), for NH3 sensors, 5 pack
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 8: General Parts List • 135
Table 12: General Parts List
Part Number
Description
33-7145
H2S scrubber disk (tan), for SO2 sensors, 5 pack
47-1019
Charging cable for multi-unit charger, 2 feet
47-5084RK
USB/IrDA adapter module, no USB cable (for all premier portables)
47-5084RK-01
USB/IrDA adapter module, with USB cable (for all premier portables)
47-5085RK
USB A to USB mini cable, 6 feet, for 47-5084RK
47-5102
5 47-1019 charging cables with connector bar, no AC adapter
49-0133
Single-unit AC adapter, with 4 foot cable
49-0134
Multi-unit AC adapter, with 2 foot cables
49-2021
Single-unit DC adapter, with 4 foot cable
49-1110RK
AAA battery
49-1625
Li-ion battery pack
49-1626
Alkaline battery pack
57-2099
Replacement Li-ion battery with board
65-7004
Dummy sensor
71-0478
Operator’s Manual, GX-3R Pro (this document)
71-0491
Operator’s Manual, GX-3R Datalogging Program
81-0000RK-51
Calibration cylinder, 200 ppm H2 in air, 34 liter steel
81-0071RK-01
Calibration cylinder, 5,000 ppm CO2 in nitrogen, 34 liter steel
81-0071RK-03
Calibration cylinder, 5,000 ppm CO2 in nitrogen, 103 liter
81-0072RK-01
Calibration cylinder, 2.5% vol CO2 in nitrogen, 34 liter steel
81-0072RK-03
Calibration cylinder, 2.5% vol CO2 in nitrogen, 103 liter
81-0076RK-01
Calibration cylinder, zero air, 34 liter steel
81-0076RK-03
Calibration cylinder, zero air, 103 liter
81-0078RK-01
Calibration cylinder, 100% N2, 34 liter steel
81-0078RK-03
Calibration cylinder, 100% N2, 103 liter
81-0090RK-01
Calibration cylinder, 3-gas (CH4/O2/CO), 34 liter steel
81-0090RK-03
Calibration cylinder, 3-gas (CH4/O2/CO), 103 liter
136 • Chapter 8: General Parts List
GX-3R Pro (TIIS Version) Operator’s Manual
Table 12: General Parts List
Part Number
Description
81-0142RK-02
Calibration cylinder, 5-gas (SO2, CH4, O2, H2S, CO), 58 liter
81-0142RK-04
Calibration cylinder, 5-gas (SO2, CH4, O2, H2S, CO), 34 liter aluminum
81-0154RK-02
Calibration cylinder, 4-gas (CH4/O2/ H2S/CO), 58 liter
81-0154RK-04
Calibration cylinder, 4-gas (CH4/O2/ H2S/CO), 34 liter aluminum
81-0170RK-02
Calibration cylinder, 5 ppm SO2 in nitrogen, 58 liter
81-0170RK-04
Calibration cylinder, 5 ppm SO2 in nitrogen, 34 liter aluminum
81-0176RK-02
Calibration cylinder, 25 ppm NH3 in nitrogen, 58 liter
81-0176RK-04
Calibration cylinder, 25 ppm NH3 in nitrogen, 34 liter aluminum
81-0180RK-02
Calibration cylinder, 10 ppm NO2 in nitrogen, 58 liter
81-0180RK-04
Calibration cylinder, 10 ppm NO2 in nitrogen, 34 liter aluminum
81-0186RK-02
Calibration cylinder, 5 ppm PH3 in nitrogen, 58 liter
81-0196RK-02
Calibration cylinder, 10 ppm HCN in nitrogen, 58 liter
81-0196RK-04
Calibration cylinder, 10 ppm HCN in nitrogen, 34 liter aluminum
81-1050RK-25
Regulator, fixed flow, 0.25 LPM, with gauge and knob, for 17 liter and 34 liter steel
cylinders (cylinders with external threads)
81-1051RK-25
Regulator, fixed flow, 0.25 LPM, with gauge and knob, for 34 liter aluminum, 58 liter,
and 103 liter cylinders (cylinders with internal threads)
81-1162
Aspirator assembly: Sample cup, aspirator bulb, 10 foot hose, and probe
81-1193
Calibration cup/sample cup for aspirator assembly
81-GX3RCO
Calibration kit: 103 liter 3-gas (CH4/O2/CO) cylinder, 0.25 LPM regulator, calibration tubing, and case
81-GX3RCO-LV
Calibration kit: 34 liter steel 3-gas (CH4/O2/ CO) cylinder, 0.25 LPM regulator,
calibration tubing, and case
81-GX3RHSCO
Calibration kit: 58 liter 4-gas (CH4/O2/ H2S/CO) cylinder, 0.25 LPM regulator,
calibration tubing, and case
81-GX3RHSCO-LV
Calibration kit: 34 liter aluminum 4-gas (CH4/O2/ H2S/CO) cylinder, 0.25 LPM
regulator, calibration tubing, and case
81-GX3RHSCO-116
Calibration kit: 116 liter aluminum 4-gas (CH4/O2/ H2S/CO), 0.25 LPM regulator,
calibration tubing, and case
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 8: General Parts List • 137
Table 12: General Parts List
Part Number
Description
81-PAA
Calibration kit: 58 liter 4-gas (CH4/O2/ H2S/CO) cylinder, 103 liter 5000 ppm CO2 in
N2 cylinder, two 0.25 LPM regulators, calibration tubing, and case
81-PAA-LV
Calibration kit: 34 liter aluminum 4-gas (CH4/O2/ H2S/CO) cylinder, 34 liter steel
5000 ppm CO2 in N2 cylinder, two 0.25 LPM regulators, calibration tubing, and case
81-PAB
Calibration kit: 58 liter 4-gas (CH4/O2/ H2S/CO) cylinder, 103 liter 2.5% volume
CO2 in N2 cylinder, two 0.25 LPM regulators, calibration tubing, and case
81-PAB-LV
Calibration kit: 34 liter aluminum 4-gas (CH4/O2/ H2S/CO) cylinder, 34 liter steel
2.5% volume CO2 in N2 cylinder, two 0.25 LPM regulators, calibration tubing, and
case
81-PAC
Calibration kit: 58 liter 5-gas (CH4/O2/ H2S/CO/SO2) cylinder, 0.25 LPM regulator,
calibration tubing, and case
81-PPA
Calibration kit: 103 liter 5,000 ppm CO2 in N2 cylinder, 0.25 LPM regulator, calibration tubing, and case
81-PPA-LV
Calibration kit: 34 liter steel 5,000 ppm CO2 in N2 cylinder, 0.25 LPM regulator, calibration tubing, and case
ESR-A13D-HCN
Hydrogen cyanide (HCN) sensor
ESR-A13D-NO2
Nitrogen dioxide (NO2) sensor
ESR-A13D-PH3
Phosphine (PH3) sensor
ESR-A13D-SO2
Sulfur dioxide (SO2) sensor
ESR-A13i-H2S
Hydrogen sulfide (H2S) sensor
ESR-A13P-CO
Carbon monoxide (CO) sensor
ESR-A1CP-CO-H
Hydrogen-compensated carbon monoxide (CO) sensor
ESR-A1DP-COHS
Dual carbon monoxide (CO) and hydrogen sulfide (H2S) sensor
ESR-B134-NH3
Ammonia (NH3) sensor
ESR-X13P-OXY
Oxygen sensor
IRR-0409
Carbon dioxide (CO2) sensor, 0 - 10% volume
IRR-0433
Carbon dioxide (CO2) sensor, 0 - 10,000 ppm
NCR-6309
Combustible gas sensor, catalytic
PT0-165
GX-3R Pro (TIIS Version)
138 • Chapter 8: General Parts List
GX-3R Pro (TIIS Version) Operator’s Manual
Appendix A: RK Link Phone App
Installing the App
1. Download and install the “RK Link” app from the App Store (for iOS) or Google Play (for
Android).
2. Launch the RK Link app.
3. Allow access to device location.
4. Allow access to contacts.
5. Allow access to photos, media, and files.
Important Setup Notes
1. Make sure no other Bluetooth devices are connected to your phone.
2. Make sure the phone’s location services are turned on. If they’re not, the coordinates in the
alert emails/text messages will be blank.
Pairing a GX-3R Pro
Multiple instruments cannot be paired with the same phone. Similarly, one instrument cannot be
paired with multiple phones.
If a paired GX-3R Pro is turned off, it must be paired with the app again when it is turned back on.
If the app is closed while a GX-3R Pro is paired, the GX-3R Pro must be paired with the app
again when the app is reopened.
1. Open the RK Link app.
2. Be sure your GX-3R Pro is turned on.
3. Be sure the GX-3R Pro’s Bluetooth is turned on in the Display Mode.
If BLE Auto Shut Off When Idle, accessible in the Datalogging or SDM-3R Program, is
selected (factory setting) and if the GX-3R Pro does not pair to a phone in the first 5
minutes after startup, the GX-3R Pro’s Bluetooth gets shut off to conserve battery life. If
you are having trouble pairing your GX-3R Pro, the Bluetooth may have timed out.
If BLE Auto Shut Off When Idle, accessible in the Datalogging or SDM-3R Program, is
deselected and if the GX-3R Pro does not pair to a phone, the GX-3R Pro’s Bluetooth stays
on indefinitely.
GX-3R Pro (TIIS Version) Operator’s Manual
Appendix A: RK Link Phone App • 139
4. Press “Pairing”.
5. If your phone’s Bluetooth is not turned on, the app will prompt you to turn it on. Press
“Allow”. Then press “Pairing” again.
6. Select the GX-3R Pro you’d like to pair with then press “Pairing”.
140 • Appendix A: RK Link Phone App
GX-3R Pro (TIIS Version) Operator’s Manual
7. A “Connection completed” message appears once the GX-3R Pro is connected to your phone.
Press “OK”.
8. The Measuring Mode screen appears.
GX-3R Pro (TIIS Version) Operator’s Manual
Appendix A: RK Link Phone App • 141
Searching for a Paired GX-3R Pro
Using the app’s detector search function allows you to find a connected GX-3R Pro that may have
been set down somewhere.
NOTE: This feature does not work if the GX-3R Pro is operating in stealth mode.
1. Press the
button in the upper right corner of the app.
2. If necessary, scroll down to make “Detector search” visible.
3. Press “Detector search”. The GX-3R Pro’s buzzer, LEDs, and vibrator activate unless the GX3R Pro is operating in Stealth Mode. If the GX-3R Pro is operating in Stealth Mode, the GX3R Pro will not respond to a detector search.
142 • Appendix A: RK Link Phone App
GX-3R Pro (TIIS Version) Operator’s Manual
Disconnecting a Paired GX-3R Pro
1. Press the
button in the upper right corner of the app.
2. If necessary, scroll down to make “Pairing disconnection” visible.
3. Press “Pairing disconnection”. The GX-3R Pro is disconnected from the phone but remains on
and functional.
4. If BLE Auto Shut Off When Idle, accessible in the Datalogging or SDM-3R Program, is
selected (factory setting), the GX-3R Pro’s Bluetooth stays on for 5 minutes after
disconnection. After 5 minutes, the GX-3R Pro’s Bluetooth gets shut off to conserve battery
life. If you want to pair to the GX-3R Pro after 5 minutes of disconnection, you will need to
turn the Bluetooth back on in Display Mode.
If BLE Auto Shut Off When Idle, accessible in the Datalogging or SDM-3R Program, is
deselected, the GX-3R Pro’s Bluetooth stays on indefinitely after disconnection. You can
pair to the GX-3R Pro at any point after disconnection.
GX-3R Pro (TIIS Version) Operator’s Manual
Appendix A: RK Link Phone App • 143
Adjusting App Notification Settings
1. Press the
button in the upper right corner of the app.
2. Press “Application settings”.
144 • Appendix A: RK Link Phone App
GX-3R Pro (TIIS Version) Operator’s Manual
3. The app notification settings appear.
• Group notification settings: If set to on, emails and text messages are sent out as long as
the Group Settings window is set up appropriately. If set to off, emails and text messages
are not sent out even if the Group Settings window is set up appropriately.
• Device notifications: If set to on, the app provides notifications for past due bump tests or
calibrations, gas alarms, man down alarms, and any faults. Notifications can be viewed in
your phone’s notification bar. If set to off, the app does not provide notifications.
• Device sound: If set to on, the app produces a notification sound. If set to off, the app does
not produce a notification sound.
• Sound type: Define the app’s notification sound.
• Device vibration: If set to on, the app vibrates when a notification occurs. If set to off, the
app does not vibrate when a notification occurs.
• Vibration type: Define the app’s vibration pattern.
• Display setting: Indicates the time format and time zone. This is not adjustable.
GX-3R Pro (TIIS Version) Operator’s Manual
Appendix A: RK Link Phone App • 145
Defining Owner Information
Owner information can be defined with or without a GX-3R Pro paired with the app. Owner
information gets sent out with email alerts along with the station ID and user ID from the GX-3R
Pro.
1. Press the
button in the upper right corner of the app.
2. Press “Application settings”.
146 • Appendix A: RK Link Phone App
GX-3R Pro (TIIS Version) Operator’s Manual
3. Press “Owner information setting” at the bottom of the screen. You may need to scroll down
to make it visible.
4. Type in the name, company name, and department name.
GX-3R Pro (TIIS Version) Operator’s Manual
Appendix A: RK Link Phone App • 147
Setting Up Email/Text Alerts
Email and text alert setup can be done with or without a GX-3R Pro paired with the app.
Figure 26: Email Alert for Past Due Bump Test
Figure 27: Text Alert for CO2 Warning and Alarm
148 • Appendix A: RK Link Phone App
GX-3R Pro (TIIS Version) Operator’s Manual
1. Press the
button in the upper right corner of the app.
GX-3R Pro Connected
GX-3R Pro Disconnected
2. Press “Application settings”.
GX-3R Pro (TIIS Version) Operator’s Manual
Appendix A: RK Link Phone App • 149
3. Make sure “Group notification settings” is turned on.
4. Press “Notification Settings”.
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5. Make sure “Application Server” is selected in the “Text Service” and “Email Service”
sections.
NOTE: The iOS version of the RK Link app only requires the “Text Service” to be
set to “Application Server”. Information saved in the “Application Server
Settings” form as described in Step 7 supersedes any selection made in the
“Email Service” section of this page.
6. Press “Application Server Settings”.
GX-3R Pro (TIIS Version) Operator’s Manual
Appendix A: RK Link Phone App • 151
7. Enter your first name, last name, phone number, and email address. All fields are required for
the notifications to function.
8. Press “OK”. A User ID is automatically generated.
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9. Use your phone’s “Back” button or the
screen.
button to get back to the “Application Settings”
10. Press “Email notification settings” at the bottom of the screen.
GX-3R Pro (TIIS Version) Operator’s Manual
Appendix A: RK Link Phone App • 153
11. Type in a group name and press “New registration”.
12. To delete a group name once it’s entered:
a. Press the
button.
b. Press “Delete group”. You may need to scroll down to make “Delete group” visible.
c. Press each group you want to delete. A check mark appears to the right of the group
name.
d. Press “OK” at the bottom of the screen to delete the selected group(s).
13. Choose the alarm types that will initiate an email or text alert then press the “plus” symbol.
• ALARM: Sends an alert or notification for any gas alarm (warning, alarm, alarm H,
STEL, TWA).
• MANDOWN: Sends an alert or notification for a man down alarm.
• FAULT: Sends an alert or notification for any sort of instrument, battery, or sensor failure
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GX-3R Pro (TIIS Version) Operator’s Manual
• REMIND: Sends an alert or notification if the instrument is due for a bump test or
calibration regardless of the instrument’s reminder on/off setting.
14. Type in an email address or phone number and press “New registration” to add the email
address/phone number to the list.
GX-3R Pro (TIIS Version) Operator’s Manual
Appendix A: RK Link Phone App • 155
15. To add contacts from your phone:
a. Press the
button.
b. Press “Register from Phone Book”. You may need to scroll down to make “Register from
Phone Book” visible.
c. Select each contact you want to use. A check mark appears to the right.
16. Press the new email address/phone number and confirm that a check mark appears to its right.
If there is no check mark, that email address/phone number will not be included in the alert!
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17. To delete an email address/phone number once it’s entered:
a. Press the
button.
b. Press “Delete registered address”. You may need to scroll down to make “Delete
registered address” visible.
c. Press each email address/phone number you want to delete. A check mark appears to its
right.
d. Press “OK” at the bottom of the screen to delete the email address(es)/phone number(s).
18. Press OK. You will be returned to the group settings screen. To add another group, type in a
new name and press “New registration”. Repeat Step 6 through Step 9.
19. Use your phone’s “Back” button to return to the Measuring Mode screen.
GX-3R Pro (TIIS Version) Operator’s Manual
Appendix A: RK Link Phone App • 157
20. To get a map preview to appear in the text message recipients’ message window:
a. Recipient must add 510.800.5926 to their contacts.
b. For Android phones, turn the link preview feature on in the message settings window.
No link preview
Link preview
Changing GX-3R Pro Parameters
GX-3R Pro parameters can only be viewed or changed when a GX-3R Pro is paired with the app.
Entering the Gas Detector Setting Menu
1. From the home screen, press the
158 • Appendix A: RK Link Phone App
button in the upper right corner of the app.
GX-3R Pro (TIIS Version) Operator’s Manual
2. Press “Gas detector setting”.
3. Type in the password and press “OK”. The password depends on your instrument settings.
• For brand new instruments whose User Mode Password parameter has not been adjusted,
the password is 0000.
• If you turned your instrument’s User Mode Password on, the app’s password is your
instrument’s User Mode password.
• If you turned your instrument’s User Mode Password on but then turned it off, the app
password is still the instrument’s old User Mode password. The app password does not go
back to 0000 after you turn off the instrument’s User Mode password.
GX-3R Pro (TIIS Version) Operator’s Manual
Appendix A: RK Link Phone App • 159
Alarm Settings
1. Access the Gas Detector Setting Menu as described on page 158.
2. Press “Alarm Setting”.
3. Press the channel whose alarm points you want to view or change. The H2S channel is
selected in the example below.
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4. The alarm points are displayed.
5. Turn the alarms on or off with the toggle button next to each alarm type.
6. Adjust the alarm setpoints by pressing the current setpoint and scrolling to the desired value.
Calibration and Bump Settings
1. Access the Gas Detector Setting Menu as described on page 158.
2. Press “Calibration/BUMP Setting”.
GX-3R Pro (TIIS Version) Operator’s Manual
Appendix A: RK Link Phone App • 161
3. Turn the calibration and bump test reminder screens on or off with the toggle buttons. Set the
calibration and bump test intervals.
4. Scroll down to view or change the auto calibration value for each channel.
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GX-3R Pro (TIIS Version) Operator’s Manual
Backlight Setting
1. Access the Gas Detector Setting Menu as described on page 158.
2. Press “Backlight setting”.
3. Set how long (in seconds) the backlight stays on after each button press. The options are 0-255
seconds. The factory setting is 30 seconds.
4. Press your phone’s “Back” button.
GX-3R Pro (TIIS Version) Operator’s Manual
Appendix A: RK Link Phone App • 163
Logger Data Settings
1. Access the Gas Detector Setting Menu as described on page 158.
2. Press “Logger Data Setting”.
3. Set the interval trend time, Station ID, and User ID. The serial number is not editable.
4. Press “Send”. There is no confirmation that the information sent.
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GX-3R Pro (TIIS Version) Operator’s Manual
Viewing Serial Number, IDs, and Bump/Cal
Information
Serial number, ID, and bump/cal information can only be viewed when a GX-3R Pro is paired
with the app.
1. Press the
button in the upper right corner of the app.
2. Press “Detector information”.
GX-3R Pro (TIIS Version) Operator’s Manual
Appendix A: RK Link Phone App • 165
3. Detector information appears.
4. To view information for the last successful calibration and bump test, press the “Calibration
BUMP history” button.
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GX-3R Pro (TIIS Version) Operator’s Manual
5. The instrument’s serial number, station ID, user ID, and part of the calibration information
appear.
6. Scroll down to view the complete calibration information and/or the bump test information.
GX-3R Pro (TIIS Version) Operator’s Manual
Appendix A: RK Link Phone App • 167
Viewing App Version Info
App version information can be viewed with or without a GX-3R Pro paired with the app.
1. Press the
button in the upper right corner of the app.
2. Press “Version information”.
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GX-3R Pro (TIIS Version) Operator’s Manual
3. Instrument information and app information appear.
4. To view the license information, press “License information”.
GX-3R Pro (TIIS Version) Operator’s Manual
Appendix A: RK Link Phone App • 169
Appendix B: Maintenance Mode
Overview
This appendix describes the GX-3R Pro in Maintenance Mode. The GX-3R Pro is factory-set to
suit most applications. Update settings in Maintenance Mode only if required for your specific
application. Maintenance Mode items and their factory settings are listed in table below.
Maintenance Mode
Menu Item
GAS CAL (page 174)
Description
Perform an air adjust, perform a span adjustment, change the calibration values,
set the cylinder group.
AIR CAL
Perform a fresh air adjustment.
CO2 ZERO
CAL
Perform a zero adjustment on the CO2 channel using 100%
nitrogen.
NOTE: Only appears in units with a CO2 sensor installed.
AUTO CAL
ESCAPE
Perform a span adjustment, set the calibration gas concentration,
and set the cylinder for each gas.
AUTO
CAL CYL
X
Perform an automatic span adjustment on the
gases selected for Cylinder X.
START
MEASURE
Begin the warmup sequence and enter Measuring
Mode.
SETTING
CAL-P
Set the calibration gas concentration for each gas.
CYL
SETTING
Assign a cylinder (A-E) to each gas. Multiple
gases can be assigned to the same cylinder.
ESCAPE
Return to the AUTO CAL menu item.
Return to the GAS CAL menu item.
GAS TEST (page 174)
Apply gas to test sensor response and observe alarm indications without an
alarm event being recorded.
SENSOR DATE (page 176)
View the replacement date for each sensor and the battery and/or set the replacement date for each sensor or the battery to the current date.
170 • Appendix B: Maintenance Mode
GX-3R Pro (TIIS Version) Operator’s Manual
Maintenance Mode
Menu Item
Description
BUMP TEST (page 177)
Perform a bump test.
BUMP
TEST CYL
X
Perform a bump test on the gases selected for Cylinder X
(A-E cylinders available).
START
MEASURE
Begin the warmup sequence and enter Measuring Mode.
ESCAPE
Return to BUMP TEST menu item.
LATCHING (page 178)
ON (factory setting): The GX-3R Pro remains in alarm until the alarm condition
passes and POWER MODE is pressed.
OFF: The GX-3R Pro automatically resets an alarm when the alarm condition
passes.
DEMAND ZERO (page 178)
ON (factory setting): You can manually perform a fresh air adjust in Measuring
Mode by pressing AIR.
OFF: You cannot manually perform a fresh air adjust in Measuring Mode by
pressing AIR.
AUTO ZERO (page 179)
ON: The GX-3R Pro asks if you want to perform a fresh air adjustment at the
end of the startup sequence.
OFF (factory setting): The GX-3R Pro does not ask if you want to perform a
fresh air adjustment at the end of the startup sequence.
ID DISPLAY (page 179)
ON: User ID and Station ID screens appear in startup sequence. IDs can be
changed in Display Mode. IDs can be edited in Display Mode if D MODE SETTING in User Mode is also set to ON.
OFF (factory setting): User ID and Station ID screens do not appear in startup
sequence. IDs cannot be changed in Display Mode.
ZERO SUPPRESS (page 110)
ON (factory setting): Not intended for field adjustment. The suppression values
are:
Combustible gas: 2% LEL
O2: 0.5% volume
H2S: 0.3 ppm
CO: 2 ppm
CO2: 0 ppm
HCN: 0.5 ppm
NH3: 4 ppm
NO2: 0.30 ppm
PH3: 0.02 ppm
SO2: 0.20 ppm
ZERO
FOLLOWER (page 110)
Not intended for field adjustment. Oxygen channel does not support zero follower functionality. Factory setting for all other channels is ON.
GX-3R Pro (TIIS Version) Operator’s Manual
Appendix B: Maintenance Mode • 171
Maintenance Mode
Menu Item
Description
DISP ZERO SUP (page 180)
ON (factory setting): Zero suppression menu item appears in User Mode.
OFF: Zero suppression menu item does not appear in User Mode.
(Zero suppression menu item is always available in Maintenance Mode)
DISP ZERO FLWR (page 180)
ON: Zero follower menu item appears in User Mode.
OFF (factory setting): Zero follower menu item does not appear in User Mode.
(Zero follower menu item is always available in Maintenance Mode)
DATE (page 181)
Set the current date and time.
DATE FORMAT (page 181)
MM/DD/YYYY (factory setting): month/day/year
YYYY/MM/DD: year/month/day
DD/MM/YYYY: day/month/year
LANGUAGE (page 182)
Set the instrument language.
Options: English (factory setting), Japanese, Italian, Spanish, German, French,
Portuguese, Russian, Korean, Chinese (TC)
MAINT PASSWORD
(page 182)
ON (factory setting): Maintenance Mode is password-protected. Factory-set
password is 8102.
OFF: Maintenance Mode is not password-protected.
ROM/SUM (page 183)
View the firmware information for the GX-3R Pro’s sensor board(s), main board,
gas list, and view the Bluetooth version.
LCD CONTRAST (page 184)
1-50 (factory setting 20)
M.DEFAULT (page 185)
Set all parameters back to their RKI factory settings.
START MEASURE (page
186)
Press and release POWER MODE to begin the warmup sequence and enter Measuring Mode.
Entering Maintenance Mode
WARNING: The GX-3R Pro is not in operation as a gas detector while in Maintenance Mode.
1. Take the GX-3R Pro to a non-hazardous location and turn it off if it is on.
2. Press and hold AIR, then press and hold POWER MODE. You will hear a beep after one
second. Continue to hold the buttons down.
3. When you hear a second beep, release the buttons.
172 • Appendix B: Maintenance Mode
GX-3R Pro (TIIS Version) Operator’s Manual
4. The screen that appears depends on the setting of Maintenance Mode’s MAINT
PASSWORD item.
If MAINT PASSWORD is set to OFF, continue with Step 7.
If MAINT PASSWORD is set to ON (factory setting), continue with Step 6.
MAINTE
7:49
MAINTE
GAS CAL
GAS TEST
SENSOR DATE
MAINTENANCE
7:49
0000
PASSWORD
MAINT PASSWORD set to OFF
MAINT PASSWORD set to ON
5. If MAINT PASSWORD is set to ON in Maintenance Mode, a password screen appears. The
first digit is flashing. The factory-set password is 8102 but it can be changed as desired.
6. Use AIR to select each password number then press POWER MODE to save it and move on
to the next number. To go back a number, press and hold AIR and POWER MODE for a few
seconds. To reverse the direction of change (ie. from increasing to decreasing or vice versa):
a. Press and hold AIR.
b. Immediately press POWER MODE and then release both buttons.
7. The Maintenance Mode menu displays.
MAINTE
7:49
GAS CAL
GAS TEST
SENSOR DATE
MAINTENANCE
8.
MAINTE
at the top of the screen indicates that the GX-3R is in Maintenance Mode.
9. Use AIR to move through the Maintenance Mode menu items.
Tips for Using Maintenance Mode
• To scroll from one menu item to the next, press and release AIR. To reverse the scrolling
direction:
a. Press and hold AIR.
b. Immediately press POWER/MODE and then release both buttons.
c. The scrolling direction returns to the original direction when you exit and reenter a menu.
• To skip an item when a question is asked, press and release AIR.
• To enter an item and to save any changes, press and release POWER MODE.
GX-3R Pro (TIIS Version) Operator’s Manual
Appendix B: Maintenance Mode • 173
• To change a flashing parameter, press and release AIR. To reverse the direction of change (ie.
from increasing to decreasing or vice versa):
a. Press and hold AIR.
b. Immediately press POWER MODE and then release both buttons.
• To exit an entered menu item without saving a change, press and hold AIR and POWER
MODE for a few seconds.
Performing a Calibration (GAS CAL)
See “Performing a Calibration (GAS CAL)” on page 75 for instructions.
Performing a Gas Test (GAS TEST)
The GAS TEST menu item allows you to apply gas to the instrument and see all alarm
indications except for the buzzer indication. There is no buzzer indication in the GAS TEST
menu even though the buzzer sounds in the event of a real gas alarm condition while in Measuring
Mode.
Preparing for a Gas Test
To perform a gas test on the GX-3R, you will need:
• A calibration cylinder. The concentrations should be above the alarm condition you want
to check. Standard alarm points are listed on page 11.
• 0.25 LPM fixed flow regulator
• Non-absorbent tubing
• Calibration cup
174 • Appendix B: Maintenance Mode
GX-3R Pro (TIIS Version) Operator’s Manual
1. Install the calibration cup onto the GX-3R Pro. Use the label and imprinting to make sure that
the calibration cup gets installed in the correct orientation relative to the GX-3R Pro. Be sure
the calibration cup is pushed on all the way.
POWER
MODE
AIR
GX-3R Pro
CO/H2 S
LEL
O2 TOXIC
FRONT
Inlet
Figure 28: Calibration Cup Installation
2. Use the tubing to connect the regulator to the inlet of the calibration cup.
Performing a Gas Test
1. While in Maintenance Mode, use AIR to place the cursor next to GAS TEST.
MAINTE
7:49
GAS CAL
GAS TEST
SENSOR DATE
MAINTENANCE
2. Press and release POWER MODE. The current gas readings display. The bottom of the LCD
indicates “GAS TEST” and “BUZZER OFF”.
7:49
CH4
%LEL
O2
%
0
CO
20.9
GAS TEST
ppm
0
CO2
H2S
ppm
0.0
vol%
0.0
BUZZER OFF
3. For toxic gas cylinders (like cylinders containing H2S), it is important to vent the regulator
while installing it onto the cylinder. Venting the regulator during installation helps prevent air
from getting into the cylinder and degrading the gas. Open the regulator by turning the knob
counterclockwise and install it onto the cylinder.
GX-3R Pro (TIIS Version) Operator’s Manual
Appendix B: Maintenance Mode • 175
4. The instrument initiates alarm indications except for the buzzer. There is no buzzer indication
in the GAS TEST menu even though the buzzer sounds in the event of a real gas alarm
condition.
5. Turn the regulator knob clockwise to close the regulator.
6. Unscrew the regulator from the calibration cylinder.
7. Remove the calibration cup from the GX-3R Pro.
8. Store the calibration kit in a safe and convenient place.
9. Press and release POWER MODE to return to Maintenance Mode.
10. See “Exiting Maintenance Mode (START MEASURE)” on page 186 to return to Measuring
Mode.
Sensor/Battery Replacement Date (SENSOR DATE)
The SEN DATE menu item allows you to keep track of when the sensors and the battery were
replaced.
1. While in Maintenance Mode, use AIR to place the cursor next to SENSOR DATE.
MAINTE
7:49
GAS TEST
SENSOR DATE
BUMP TEST
MAINTENANCE
2. Press and release POWER MODE. The combustible gas sensor’s replacement date appears.
MAINTE
7:49
CH4
MM/DD/YYYY
10/12/2018
SENSOR DATE
176 • Appendix B: Maintenance Mode
GX-3R Pro (TIIS Version) Operator’s Manual
3. Use AIR to scroll to the item whose replacement date you want to view or change.
MAINTE
AIR
MAINTE
7:49
CH4
MM/DD/YYYY
10/12/2018
SENSOR DATE
AIR
MAINTE
7:49
O2
MM/DD/YYYY
1/30/2018
SENSOR DATE
AIR
MAINTE
7:49
H2S
MM/DD/YYYY
1/30/2018
SENSOR DATE
7:49
CO
MM/DD/YYYY
10/12/2018
SENSOR DATE
AIR
MAINTE
7:49
CO2
MM/DD/YYYY
10/12/2018
SENSOR DATE
AIR
MAINTE
7:49
BATTERY
MM/DD/YYYY
10/12/2018
SENSOR DATE
AIR
MAINTE
7:49
ESCAPE
4. To change the replacement date:
a. With the desired item displayed, press and release POWER MODE.
b. Press and release POWER MODE again to set the replacement date to the current date.
5. Use the AIR button to scroll to the ESCAPE menu item.
6. Press and release POWER MODE to return to Maintenance Mode.
7. See “Exiting Maintenance Mode (START MEASURE)” on page 186 to return to Measuring
Mode.
Performing a Bump Test (BUMP TEST)
See “Performing a Bump Test (BUMP TEST)” on page 68 for instructions.
GX-3R Pro (TIIS Version) Operator’s Manual
Appendix B: Maintenance Mode • 177
Setting Alarms to Latching or Self-Resetting
(LATCHING)
ON (factory setting): The GX-3R Pro remains in alarm until the alarm condition passes and
POWER MODE is pressed.
OFF: The GX-3R Pro automatically resets an alarm when the alarm condition passes.
1. While in Maintenance Mode, use AIR to place the cursor next to LATCHING.
MAINTE
7:49
BUMP TEST
LATCHING
DEMAND ZERO
MAINTENANCE
2. Press and release POWER MODE. The current setting flashes.
3. Use AIR to display the desired setting.
4. Press and release POWER MODE to save the setting and return to Maintenance Mode.
5. See “Exiting Maintenance Mode (START MEASURE)” on page 186 to return to Measuring
Mode.
Turning Demand Zero On/Off (DEMAND ZERO)
ON (factory setting): You can manually perform a fresh air adjust in Measuring Mode by pressing
AIR.
OFF: You cannot manually perform a fresh air adjust in Measuring Mode.
1. While in Maintenance Mode, use AIR to place the cursor next to DEMAND ZERO.
MAINTE
7:49
LATCHING
DEMAND ZERO
AUTO ZERO
MAINTENANCE
2. Press and release POWER MODE. The current setting flashes.
3. Use AIR to display the desired setting.
4. Press and release POWER MODE to save the setting and return to Maintenance Mode.
5. See “Exiting Maintenance Mode (START MEASURE)” on page 186 to return to Measuring
Mode.
178 • Appendix B: Maintenance Mode
GX-3R Pro (TIIS Version) Operator’s Manual
Turning Auto Zero On/Off (AUTO ZERO)
ON: The GX-3R Pro asks if you want to perform a fresh air adjustment at the end of the startup
sequence.
OFF (factory setting): The GX-3R Pro does not ask if you want to perform a fresh air adjustment
at the end of the startup sequence.
1. While in Maintenance Mode, use AIR to place the cursor next to AUTO ZERO.
MAINTE
7:49
DEMAND ZERO
AUTO ZERO
ID DISPLAY
MAINTENANCE
2. Press and release POWER MODE. The current setting flashes.
3. Use AIR to display the desired setting.
4. Press and release POWER MODE to save the setting and return to Maintenance Mode.
5. See “Exiting Maintenance Mode (START MEASURE)” on page 186 to return to Measuring
Mode.
Turning ID Display Function On/Off (ID DISPLAY)
ON: The User ID and Station ID screens appear in startup sequence. If D MODE SETTING in
User Mode is also set to ON, then the IDs can be changed in Display Mode.
OFF (factory setting): The User ID and Station ID screens do not appear in startup sequence and
the IDs cannot be changed in Display Mode.
1. While in Maintenance Mode, use AIR to place the cursor next to ID DISPLAY.
MAINTE
7:49
AUTO ZERO
ID DISPLAY
ZERO SUPPRESS
MAINTENANCE
2. Press and release POWER MODE. The current setting flashes.
3. Use AIR to display the desired setting.
4. Press and release POWER MODE to save the setting and return to Maintenance Mode.
5. See “Exiting Maintenance Mode (START MEASURE)” on page 186 to return to Measuring
Mode.
GX-3R Pro (TIIS Version) Operator’s Manual
Appendix B: Maintenance Mode • 179
Turning Zero Suppression On/Off (ZERO SUPPRESS)
The ZERO SUPPRESS setting is not intended for field adjustment. The default setting for each
sensor is ON.
Sensor
Zero
Suppression
Value
Combustible Gas
2% LEL
O2
0.5% volume
H2 S
0.3 ppm
CO
2 ppm
CO2
0 ppm
HCN
0.5 ppm
NH3
4 ppm
NO2
0.30 ppm
PH3
0.02 ppm
SO2
0.20 ppm
Turning Zero Follower On/Off (ZERO FOLLOWER)
The ZERO FOLLOWER setting is not intended for field adjustment. The oxygen channel does
not support zero follower functionality. The default setting is ON for all other channels.
User Mode Zero Suppression (DISP ZERO SUP)
ON (factory setting): Zero suppression menu item appears in User Mode.
OFF: Zero suppression menu item does not appear in User Mode. Zero suppression menu item is
always available in Maintenance Mode.
User Mode Zero Follower (DISP ZERO FLWR)
ON: Zero follower menu item appears in User Mode.
OFF (factory setting): Zero follower menu item does not appear in User Mode. Zero follower
menu item is always available in Maintenance Mode.
180 • Appendix B: Maintenance Mode
GX-3R Pro (TIIS Version) Operator’s Manual
It is not normally necessary to have the zero follower menu item appear in User Mode. Contact
RKI Instruments before turning this setting on.
Setting the Date/Time (DATE)
1. While in Maintenance Mode, use AIR to place the cursor next to DATE.
MAINTE
7:49
DISP ZERO FLWR
DATE
DATE FORMAT
MAINTENANCE
2. Press and release POWER MODE. The date and time appear and the year flashes.
MAINTE
7:49
MM/DD/YYYY
1/14/2019
7:49
DATE
3. Use AIR to display the desired year.
4. Press and release POWER MODE to save the setting. The month setting flashes.
5. Repeat Step 3 and Step 4 to enter the month, day, hours, and minutes settings. The date and
time are saved and the instrument returns to Maintenance Mode.
6. See “Exiting Maintenance Mode (START MEASURE)” on page 186 to return to Measuring
Mode.
Setting the Date Format (DATE FORMAT)
MM/DD/YYYY (factory setting): month/day/year.
YYYY/MM/DD: year, month, day.
DD/MM/YYYY: day, month, year.
1. While in Maintenance Mode, use AIR to place the cursor next to DATE FORMAT.
MAINTE
7:49
DATE
DATE FORMAT
LANGUAGE
MAINTENANCE
2. Press and release POWER MODE. The current setting flashes.
GX-3R Pro (TIIS Version) Operator’s Manual
Appendix B: Maintenance Mode • 181
3. Use AIR to display the desired setting.
4. Press and release POWER MODE to save the setting and return to Maintenance Mode.
5. See “Exiting Maintenance Mode (START MEASURE)” on page 186 to return to Measuring
Mode.
Setting the Instrument Language (LANGUAGE)
English (factory setting), Japanese, Italian, Spanish, German, French, Portuguese, Russian,
Korean, Chinese (TC)
1. While in Maintenance Mode, use AIR to place the cursor next to LANGUAGE.
MAINTE
7:49
DATE FORMAT
LANGUAGE
MAINT PASSWORD
MAINTENANCE
2. Press and release POWER MODE. The current setting flashes.
3. Use AIR to display the desired setting.
4. Press and release POWER MODE to save the setting and return to Maintenance Mode.
5. See “Exiting Maintenance Mode (START MEASURE)” on page 186 to return to Measuring
Mode.
Turning the Password On/Off (MAINT PASSWORD)
ON (factory setting): The GX-3R Pro prompts you for a password when you enter Maintenance
Mode. The factory-set password is 8102 but can be changed as desired.
OFF: No password is required to enter Maintenance Mode.
1. While in Maintenance Mode, use AIR to place the cursor next to PASSWORD.
MAINTE
7:49
LANGUAGE
MAINT PASSWORD
ROM / SUM
MAINTENANCE
2. Press and release POWER MODE. The current setting flashes.
3. Use AIR to display the desired setting.
182 • Appendix B: Maintenance Mode
GX-3R Pro (TIIS Version) Operator’s Manual
4. If you selected OFF, press and release POWER MODE to save the setting and return to
Maintenance Mode.
If you selected ON, continue with Step 5.
5. Press and release POWER MODE. The Set Password Screen appears. The current password
appears and the first digit flashes.
MAINTE
7:49
8102
MAINT PASSWORD
6. Use AIR to display a number from 0 to 9.
7. Press and release POWER MODE to enter the selection and advance to the next number. To
go back a number, press and hold AIR and POWER MODE for a few seconds.
8. Repeat Step 6 and Step 7 to select the remaining numbers. When you press and release
POWER MODE to enter the last number, the password is saved and the instrument returns to
Maintenance Mode.
9. See “Exiting Maintenance Mode (START MEASURE)” on page 186 to return to Measuring
Mode.
Viewing the ROM/SUM (ROM/SUM)
The ROM/SUM screen shows the instrument’s firmware version and the firmware checksum.
1. While in Maintenance Mode, use AIR to place the cursor next to ROM/SUM.
MAINTE
7:49
MAINT PASSWORD
ROM / SUM
LCD CONTRAST
MAINTENANCE
GX-3R Pro (TIIS Version) Operator’s Manual
Appendix B: Maintenance Mode • 183
2. Press and release POWER MODE. The screen cycles through the main board’s ROM/SUM,
the sensor board’s ROM/SUM, the Bluetooth version, the IR sensor’s ROM/SUM (if an IR
sensor is installed), and the gas list’s ROM/SUM. The ROM is the top value and the SUM is
the bottom value.
MAINTE
7:49
00.00.21
MAINTE
7:49
BLUETOOTH
35708
BAB8
ROM/SUM MAIN
MAINTE
MAINTE
7:49
05672
8EAC
ROM/SUM IR SENS
7:49
35707
C1E3
ROM/SUM SENSOR
MAINTE
7:49
06109
AEDB
ROM/SUM GAS
3. Press and release POWER MODE to return to the ROM/SUM menu item in Maintenance
Mode.
4. See “Exiting Maintenance Mode (START MEASURE)” on page 186 to return to Measuring
Mode.
Adjusting the LCD’s Contrast (LCD CONTRAST)
Higher number means darker background. Lower number means lighter background. 1-50. 20 is
factory setting.
1. While in Maintenance Mode, use AIR to place the cursor next to LCD CONTRAST.
MAINTE
7:49
ROM / SUM
LCD CONTRAST
M.DEFAULT
MAINTENANCE
184 • Appendix B: Maintenance Mode
GX-3R Pro (TIIS Version) Operator’s Manual
2. Press and release POWER MODE. The current setting flashes.
3. Use AIR to display the desired setting.
4. Press and release POWER MODE to save the setting and return to Maintenance Mode.
5. See “Exiting Maintenance Mode (START MEASURE)” on page 186 to return to Measuring
Mode.
Performing a Default (M.DEFAULT)
Performing a default operation in Maintenance Mode returns all parameters to their RKI factory
settings.
1. While in Maintenance Mode, use AIR to place the cursor next to M.DEFAULT.
MAINTE
7:49
LCD CONTRAST
M.DEFAULT
START MEASURE
MAINTENANCE
2. Press and release POWER MODE. The instrument asks if you want to restore all defaults.
MAINTE
7:49
RESTORE ALL ?
YES : MODE
M .DEFAULT
MAINTE
7:49
RESTORE ALL ?
NO : AIR
M .DEFAULT
3. Press and release POWER MODE to continue. Press and release AIR to return to
Maintenance Mode.
4. The instrument asks if you are sure you want to restore the defaults.
MAINTE
7:49
ARE YOU SURE ?
YES : MODE
M .DEFAULT
MAINTE
7:49
ARE YOU SURE ?
NO : AIR
M .DEFAULT
5. Press and release POWER MODE to perform the default operation. Press and release AIR to
return to Maintenance Mode.
6. The instrument beeps twice and returns to Maintenance Mode.
7. See “Exiting Maintenance Mode (START MEASURE)” on page 186 to return to Measuring
Mode.
GX-3R Pro (TIIS Version) Operator’s Manual
Appendix B: Maintenance Mode • 185
Exiting Maintenance Mode (START MEASURE)
1. While in Maintenance Mode, use AIR to place the cursor next to START MEASURE.
MAINTE
7:49
LCD CONTRAST
M. DEFAULT
START MEASURE
MAINTENANCE
2. Press and release POWER MODE.
3. The instrument begins its start-up sequence.
186 • Appendix B: Maintenance Mode
GX-3R Pro (TIIS Version) Operator’s Manual
Appendix C: Gas Select Mode
Overview
This appendix describes the GX-3R Pro in Gas Select Mode. The GX-3R Pro is factory-set to suit
most applications. Update settings in Gas Select Mode only if required for your specific
application. A description of the Gas Select Mode items is shown in table below.
Menu Item (Page # of
Description)
Description
GAS COMBO (page 189)
Turn channels on or off and change target gas for each channel.
SAVE ALARM-P (page 192)
Set the current alarm points as the default alarm points.
DISP MAX SPAN (page 193)
ON: Maximum span screen appears after a successful calibration.
OFF (factory setting): No maximum span screen appears.
STEALTH (page 193)
STEALTH ON: No backlight, LED, or buzzer operation.
STEALTH OFF (factory setting): Backlight, LED, and buzzer operate
normally.
This setting has no effect unless STEALTH is set to ON.
VIBRATION ON: Vibrator activates for alarm conditions.
VIBRATION OFF (factory setting): Vibrator does not activate in any situation.
CHANGE LEL (page 194)
STANDARD (factory setting): Apply standard settings for lower explosive limit’s ppm level.
IEC: Apply IEC settings for lower explosive limit’s ppm level.
ISO: Apply ISO settings for lower explosive limit’s ppm level.
START MEASURE (page 196)
Enter Measuring Mode
Entering Gas Select Mode
WARNING: The GX-3R Pro is not in operation as a gas detector while in Gas Select Mode.
1. Take the GX-3R Pro to a non-hazardous location and turn it off if it is on.
2. Press and hold AIR, then press and hold POWER MODE. You will hear a beep after one
second. Continue to hold the buttons down.
3. You will hear a second beep. Continue to hold the buttons down.
4. When you hear a third beep, release the buttons.
GX-3R Pro (TIIS Version) Operator’s Manual
Appendix C: Gas Select Mode • 187
5. The password screen appears. The first digit is flashing. The password is 2014.
MAINTE
7:49
0000
PASSWORD
6. Use AIR to select each password number then press POWER MODE to save it and move on
to the next number. To go back a number, press and hold AIR and POWER MODE for a few
seconds. To reverse the direction of change (ie. from increasing to decreasing or vice versa):
a. Press and hold AIR.
b. Immediately press POWER MODE and then release both buttons.
7. The Gas Select Mode menu appears.
MAINTE
7:49
GAS COMBO
SET DEF ALM--P
DISP MAX SPAN
GAS SELECT MODE
8.
MAINTE
at the top of the screen indicates that the GX-3R is in Gas Select Mode.
9. Use AIR to move through the Gas Select Mode menu items.
Tips for Using Gas Select Mode
• To scroll from one menu item to the next, press and release AIR. To reverse the scrolling
direction:
a. Press and hold AIR.
b. Immediately press POWER/MODE and then release both buttons.
c. The scrolling direction returns to the original direction when you exit and reenter a menu.
• To skip an item when a question is asked, press and release AIR.
• To enter an item and to save any changes, press and release POWER MODE.
• To change a flashing parameter, press and release AIR. To reverse the direction of change (ie.
from increasing to decreasing or vice versa):
a. Press and hold AIR.
b. Immediately press POWER MODE and then release both buttons.
• To exit an entered menu item without saving a change, press and hold AIR and POWER
MODE for a few seconds.
188 • Appendix C: Gas Select Mode
GX-3R Pro (TIIS Version) Operator’s Manual
Changing the Gas Combination (GAS COMBO)
The GAS COMBO menu item allows you to turn channels on and off and change each channel’s
target gas.
If you want the combustible gas channel to be calibrated to a specific target gas, select that target
gas here and then calibrate to it in User Mode (see page 75).
1. While in Gas Select Mode, use AIR to place the cursor next to GAS COMBO.
MAINTE
7:49
GAS COMBO
SAVE ALARM--P
DISP MAX SPAN
GAS SELECT MODE
2. Press and release POWER MODE. The first channel appears.
MAINTE
CH4
7:49
%LEL
----
GAS COMBO
GX-3R Pro (TIIS Version) Operator’s Manual
Appendix C: Gas Select Mode • 189
3. Press AIR to scroll to the instrument channel whose target gas you want to change.
MAINTE
CH4
7:49
MAINTE
%LEL
CO
AIR
----
GAS COMBO
----
GAS COMBO
AIR
MAINTE
O2
7:49
ppm
AIR
7:49
MAINTE
%
7:49
CO2
----
----
GAS COMBO
GAS COMBO
AIR
AIR
MAINTE
vol%
7:49
MAINTE
H2S
7:49
ppm
----
ESCAPE
GAS COMBO
4. Press and release POWER MODE.
5. The target gas for the channel appears.
MAINTE
7:49
CH4
GAS COMBO
190 • Appendix C: Gas Select Mode
GX-3R Pro (TIIS Version) Operator’s Manual
6. Use AIR to change the target gas or turn the channel off.
Channel
Target Gas Options
Combustible
Gas
• CH4 (methane)
• C7H8 (toluene)
• i-C4H10 (isobutane)
• n-C7H16 (heptane)
• H2 (hydrogen)
• C8H10 (xylene)
• CH3OH (methanol)
• n-C9H20 (nonane)
• C2H2 (acetylene)
• EtAc (ethyl acetate)
• C2H4 (ethylene)
• IPA (isopropyl alcohol)
• C2H6 (ethane)
• MEK (methyl ethyl ketone)
• C2H5OH (ethanol)
• MMA (methyl methacrylate)
• C3H6 (propylene)
• DME (dimethyl ether)
• C3H6O (acetone)
• MIBK (methyl isobutyl ketone)
• C3H8 (propane)
• THF (tetrahydrofuran)
• C4H6 (butyne)
• n-C5H12 (n-pentane)
• C5H10 (cyclopentane)
• CH4_VOL (methane % volume)*
• C6H6 (benzene)
• ---------- (off)
• n-C6H14 (hexane)
O2
• O2 (oxygen)
• ---------- (off)
H2S
• H2S (hydrogen sulfide for dual CO/H2S sensor)
• H2S SINGLE (hydrogen sulfide for single-gas H2S sensor)
• H2_CO-H2 (hydrogen compensated CO)
• ----------- (off)
CO
• CO (carbon monoxide for dual CO/H2S sensor or single-gas CO sensor)
• SO2 (sulfur dioxide)
• CO_CO-H2 (hydrogen compensated CO)
• HCN (hydrogen cyanide)
• ----------- (off)
5th gas
• EXTRA (for CO2 sensors)
• SO2 (sulfur dioxide)
• H2S (hydrogen sulfide for single-gas H2S sensor)
• NH3 (ammonia)
• NO2 (nitrogen dioxide)
• HCN (hydrogen cyanide)
• PH3 (phosphine)
• ----------- (off)
* If CH4_VOL is selected, the CHANGE LEL item in Gas Select Mode has no effect on operation.
GX-3R Pro (TIIS Version) Operator’s Manual
Appendix C: Gas Select Mode • 191
7. Press and release POWER MODE to save the setting.
8. Repeat Step 1 - Step 7 to change the target gas for other channels.
9. Use AIR to scroll to ESCAPE.
10. Press and release POWER MODE. The instrument returns to Gas Select Mode.
11. See “Exiting Gas Select Mode (START MEASURE)” on page 196 to return to Measuring
Mode.
Saving the Alarm Points (SAVE ALARM-P)
Performing a SAVE ALARM-P operation saves the current alarm setpoints.
Performing a DEFAULT ALM-P operation in the ALARM SETTING User Mode menu item
sets the instrument’s alarm points to those saved during the SAVE ALARM-P operation (if
performed).
Performing a SAVE ALARM-P operation has no effect on an M.DEFAULT in Maintenance
Mode. An M.DEFAULT operation returns all instrument settings to the RKI default regardless of
if a SAVE ALARM-P operation was performed.
1. While in Gas Select Mode, use AIR to place the cursor next to SAVE ALARM-P.
MAINTE
7:49
GAS COMBO
SAVE ALARM--P
DISP MAX SPAN
GAS SELECT MODE
2. Press and release POWER MODE. The display alternate between the following screens.
MAINTE
7:49
ARE YOU SURE ?
YES : MODE
SAVE ALARM-P
MAINTE
7:49
ARE YOU SURE ?
NO : AIR
SAVE ALARM-P
3. Press and release POWER MODE to save the current alarm point settings as the default.
4. The instrument returns to Gas Select Mode.
5. See “Exiting Gas Select Mode (START MEASURE)” on page 196 to return to Measuring
Mode.
192 • Appendix C: Gas Select Mode
GX-3R Pro (TIIS Version) Operator’s Manual
Turning the Calibration Max Span On/Off (DISP MAX
SPAN)
ON: After a passed calibration, the GX-3R displays the maximum possible adjustment it could
have made to the response reading. So if the combustible gas channel was calibrated with 50%
LEL gas and the maximum indicated span is 95% LEL, this means that there was enough
adjustment left on that channel to set the reading to 95% LEL when the detector was exposed to
50% LEL gas. If the maximum span value is close to the calibration gas value, for example if it is
53% LEL when exposed to 50% LEL gas, the sensor should be replaced soon. The upper limit on
the maximum adjustment indicated for all channels except for oxygen is either twice the
calibration value or full scale, whichever is lower. The upper limit on the maximum adjustment
indicated for the oxygen channel is 25.0% volume.
OFF (factory setting): There is no maximum span indication at the end of a calibration.
1. While in Gas Select Mode, use AIR to place the cursor next to DISP MAX SPAN.
MAINTE
7:49
SET DEF ALM-P
DISP MAX SPAN
STEALTH
GAS SELECT MODE
2. Press and release POWER MODE. The current setting flashes.
3. Use AIR to display the desired setting.
4. Press and release POWER MODE to save the setting and return to Gas Select Mode.
5. See “Exiting Gas Select Mode (START MEASURE)” on page 196 to return to Measuring
Mode.
Stealth and Vibrator Settings (STEALTH)
STEALTH
ON:
• The instrument’s backlight does not come on, regardless of the BACKLIGHT TIME
setting.
• The instrument’s LEDs do not come on for any reason, even alarm conditions.
• The instrument’s buzzer does not sound for any reason, even alarm conditions.
• An “S” appears at the top of the LCD.
OFF (factory setting): The instrument’s backlight and LEDs operate normally.
GX-3R Pro (TIIS Version) Operator’s Manual
Appendix C: Gas Select Mode • 193
VIBRATION
The VIBRATION setting only affects instrument operation if STEALTH is set to ON.
ON: The vibrator activates for alarm conditions. It can be useful to have this feature turned on if
you have also turned STEALTH on.
OFF (factory setting): The vibrator does not activate for any reason.
1. While in Gas Select Mode, use AIR to place the cursor next to DISP MAX SPAN.
MAINTE
7:49
DISP MAX SPAN
STEALTH
CHANGE LEL
GAS SELECT MODE
2. Press and release POWER MODE. The current setting flashes.
3. Press and release POWER MODE. The current STEALTH setting flashes.
4. Use AIR to display the desired setting.
5. Press and release POWER MODE. The current VIBRATION setting flashes.
6. Use AIR to display the desired setting.
7. Press and release POWER MODE to save the setting and return to Gas Select Mode.
8. See “Exiting Gas Select Mode (START MEASURE)” on page 196 to return to Measuring
Mode.
LEL Definition (CHANGE LEL)
The CHANGE LEL menu item defines what standard the instrument follows in determining the
LEL (lower explosive limit) for the combustible channel’s target gas.
STANDARD: Apply the standards settings for the lower explosive limit’s ppm level.
IEC: Apply the IEC settings (per IEC 60079-20-1 2010[ed1.0]) for the lower explosive limit’s
ppm level.
ISO: Apply the ISO settings (per ISO 10156 2017) for the lower explosive limit’s ppm level.
Gas
Standard
(ppm)
IEC (ppm)
ISO (ppm)
Methane (CH4)
50,000
44,000
44,000
Isobutane (i-C4H10)
18,000
13,000
15,000
Hydrogen (H2)
40,000
40,000
40,000
Methanol (CH3OH)
55,000
60,000
60,000
Acetylene (C2H2)
15,000
23,000
23,000
194 • Appendix C: Gas Select Mode
GX-3R Pro (TIIS Version) Operator’s Manual
Gas
Standard
(ppm)
IEC (ppm)
ISO (ppm)
Ethylene (C2H4)
27,000
23,000
24,000
Ethane (C2H6)
30,000
24,000
24,000
Ethanol (C2H5OH)
33,000
31,000
31,000
Propylene (C3H6)
20,000
20,000
18,000
Acetone (C3H6O)
21,500
25,000
25,000
Propane (C3H8)
20,000
17,000
17,000
Butadiene (C4H6)
11,000
14,000
14,000
Cyclopentane (C5H10)
14,000
14,000
14,000*
N-pentane (n-C5H12)
15,000
11,000
11,000
Benzene (C6H6)
12,000
12,000
12,000
N-hexane (n-C6H14)
12,000
10,000
10,000
Toluene (C7H8)
12,000
10,000
10,000
N-heptane (n-C7H16)
11,000
8,500
8,000
Xylene (C8H10)
10,000
10,000
10,000*
N-nonane (n-C9H20)
7,000
7,000
7,000
Ethyl acetate (EtAc)
21,000
20,000
20,000
Isopropyl alcohol (IPA)
20,000
20,000
20,000*
Methyl ethyl ketone (MEK)
18,000
15,000
15,000
Methyl methacrylate (MMA)
17,000
17,000
17,000*
Dimethyl ether (DME)
30,000
27,000
27,000
Methyl isobutyl ketone (MIBK)
12,000
12,000
12,000*
Tetrahydrofuran (THK)
20,000
15,000
15,000*
* Values are actually IEC because no ISO definition exists for these gases.
GX-3R Pro (TIIS Version) Operator’s Manual
Appendix C: Gas Select Mode • 195
1. While in Gas Select Mode, use AIR to place the cursor next to CHANGE LEL.
MAINTE
7:49
STEALTH
CHANGE LEL
START MEASURE
GAS SELECT MODE
2. Press and release POWER MODE. The current setting flashes.
3. Use AIR to display the desired setting.
4. Press and release POWER MODE to save the setting and return to Gas Select Mode.
5. See “Exiting Gas Select Mode (START MEASURE)” on page 196 to return to Measuring
Mode.
Exiting Gas Select Mode (START MEASURE)
1. From the main menu, place the cursor in front of START MEASURE at the bottom of the
menu.
MAINTE
7:49
STEALTH
CHANGE LEL
START MEASURE
GAS SELECT MODE
2. Press and release POWER MODE.
3. The unit begins its start-up sequence.
196 • Appendix C: Gas Select Mode
GX-3R Pro (TIIS Version) Operator’s Manual
Appendix D: Interference Information
ESR-A13D-HCN, HCN Detection
Table 13: Interference Chart for ESR-A13D-HCN, HCN Detection
Gas
Chemical
Formula
Concentration
Indication
Value
Acetone
C3H6O
5000 ppm
1.0 ppm
Acetylene
C2H2
5 ppm
11.2 ppm
Ammonia
NH3
38.6 ppm
0.2 ppm
Carbon Dioxide
CO2
20.0 vol%
0.2 ppm
Carbon Monoxide
CO
100 ppm
0.3 ppm
Chlorine
Cl2
0.2 ppm
0.2 ppm
Ethane
C2H6
1.6 vol%
0.0 ppm
Ethanol
C2H5OH
8333 ppm
-0.8 ppm*
Hydrogen
H2
500 ppm
1.1 ppm
Hydrogen Sulfide
H2S
25.0 ppm
0.2 ppm
Isobutane
i-C4H10
0.72 vol%
12.3 ppm
Isopropyl Alcohol
C3H8O
5000 ppm
1.8 ppm*
Methane
CH4
5.0 vol%
0.0 ppm
Methyl Ethyl Ketone
C4H8O
5000 ppm
0.6 ppm
Methyl Methacrylate
C5H8O2
4250 ppm
0.3 ppm
n-Hexane
n-C6H14
3000 ppm
0.0 ppm
Nitrogen Dioxide
NO2
6.1 ppm
-28.9 ppm*
Nitrogen Monoxide
NO
5.0 ppm
-12.7 ppm*
Ozone
O3
0.45 ppm
-0.2 ppm
Phosphine
PH3
0.48 ppm
4.0 ppm
Propane
C3H8
0.88 vol%
0.1 ppm
Propylene
C3H6
0.7 vol%
34.6 ppm
Sulfur Dioxide
SO2
30.0 ppm
0.2 ppm
*
The indicated value may fluctuate when exposed to this gas.
GX-3R Pro (TIIS Version) Operator’s Manual
Appendix D: Interference Information • 197
ESR-A13D-NO2, NO2 Detection
Table 14: Interference Chart for ESR-A13D-NO2, NO2 Detection
Gas
Chemical
Formula
Concentration
Indication
Value
Acetone
C3H6O
0.54 vol%
-0.24 ppm
Acetylene
C2 H 2
100 ppm
-0.19 ppm
Ammonia
NH3
38.6 ppm
-0.02 ppm
Benzene
C6 H 6
0.30 vol%
-0.73 ppm*
Carbon Dioxide
CO2
20.0 vol%
-0.02 ppm
Carbon Monoxide
CO
99.9 ppm
-0.54 ppm
Chlorine
Cl2
2.0 ppm
-0.20 ppm
Cyclopentane
C5H10
0.35 vol%
-0.03 ppm
Ethane
C2 H6
0.75 vol%
-0.02 ppm
Ethanol
C2H5OH
8333 ppm
-0.22 ppm*
Ethyl Acetate
C4H8O2
0.53 vol%
-0.11 ppm
Fluorine
F2
1.6 ppm
-0.04 ppm
Hydrogen
H2
500 ppm
-0.80 ppm
Hydrogen Bromide
HBr
9.0 ppm
-0.04 ppm
Hydrogen Chloride
HCl
3.2 ppm
-0.06 ppm
Hydrogen Sulfide
H2 S
25.0 ppm
-0.09 ppm
Isobutane
i-C4H10
0.45 vol%
-0.05 ppm
Isobuten
C4 H8
1000 ppm
-27.14 ppm
Isopropyl Alcohol
C3H8O
0.50 vol%
-0.63 ppm
Methane
CH4
1.26 vol%
-0.09 ppm
Methanol
CH3OH
1.38 vol%
-2.32 ppm*
Methyl Ethyl Ketone
C4H8O
0.45 vol%
-1.09 ppm
Methyl Isobutyl Ketone
C6H12O
0.30 vol%
-0.20 ppm
Methyl Methacrylate
C5H8O2
4250 ppm
-0.13 ppm
198 • Appendix D: Interference Information
GX-3R Pro (TIIS Version) Operator’s Manual
Table 14: Interference Chart for ESR-A13D-NO2, NO2 Detection
Gas
Chemical
Formula
Concentration
Indication
Value
n-Hexane
n-C6H14
0.30 vol%
-0.02 ppm
Nitrogen Monoxide
NO
99.2 ppm
-3.12 ppm
Nonane
n-C9H2O
0.18 vol%
-0.01 ppm
Ozone
O3
0.48 ppm
0.30 ppm
Phosphine
PH3
2.51 ppm
-0.02 ppm
Propane
C3 H8
0.49 vol%
-0.01 ppm
Propylene
C3 H 6
0.5 vol%
-48.27 ppm
Sulfur Dioxide
SO2
5 ppm
-4.99 ppm
Tetrahydrofuran
C4H8O
0.50 vol%
-0.90 ppm*
Toluene
C7 H8
1.0 vol%
-0.46 ppm*
Xylene
C8H10
1.0 vol%
-0.12 ppm*
*
The indicated value may fluctuate when exposed to this gas.
GX-3R Pro (TIIS Version) Operator’s Manual
Appendix D: Interference Information • 199
ESR-A13D-PH3, PH3 Detection
Table 15: Interference Chart for ESR-A13D-PH3, PH3 Detection
Gas
Chemical
Formula
Concentration
Indication
Value
Acetone
C3H6O
0.54 vol%
0.01 ppm
Acetylene
C2H2
99.7 ppm
20.01 ppm
Ammonia
NH3
40.9 ppm
0.00 ppm
Arsine
AsH3
1.07 ppm
0.80 ppm
Bromomethane
CH3Br
150 ppm
0.01 ppm
Carbon Dioxide
CO2
20.0 vol%
0.00 ppm
Carbon Monoxide
CO
100 ppm
0.03 ppm
Diborane
B2H6
5.1 ppm
1.14 ppm
Disilane
Si2H6
7.2 ppm
6.54 ppm
Ethanol
C2H5OH
8333 ppm
0.00 ppm
Ethyl Acetate
C4H8O2
0.53 vol%
0.01 ppm
Hydrogen
H2
500 ppm
0.05 ppm
Hydrogen Chloride
HCl
8.0 ppm
0.00 ppm
Hydrogen Cyanide
HCN
5.0 ppm
0.39 ppm
Hydrogen Selenide
H2Se
10 ppm
4.45 ppm
Hydrogen Sulfide
H2S
25.0 ppm
10.60 ppm
Isopropyl Alcohol
C3H8O
0.50 vol%
0.02 ppm
Methane
CH4
2.56 vol%
0.00 ppm
Methanol
CH3OH
1.38 vol%
0.00 ppm
Nitrogen Dioxide
NO2
5.0 ppm
-1.28 ppm
Nitrogen Monoxide
NO
100 ppm
-0.44 ppm
Propylene
C3H6
0.5 vol%
1.99 ppm
Silane
SiH4
7.2 ppm
4.08 ppm
Sulphur Dioxide
SO2
8.0 ppm
0.00 ppm
Toluene
C7H8
1.0 vol%
-2.01 ppm
Xylene
C8H10
1.0 vol%
-1.04 ppm
200 • Appendix D: Interference Information
GX-3R Pro (TIIS Version) Operator’s Manual
ESR-A13D-SO2, SO2 Detection
Table 16: Interference Chart for ESR-A13D-SO2, SO2 Detection
Gas
Chemical
Formula
Concentration
Indication
Value
Acetone
C3H6O
0.54 vol%
0.24 ppm
Acetylene
C2H2
100 ppm
0.19 ppm
Ammonia
NH3
38.6 ppm
0.02 ppm
Benzene
C6H6
0.30 vol%
0.73 ppm*
Carbon Dioxide
CO2
20.0 vol%
0.02 ppm
Carbon Monoxide
CO
99.9ppm
0.54 ppm
Chlorine
Cl2
2.0 ppm
0.20 ppm
Cyclopentane
C5H10
0.35 vol%
0.03 ppm
Ethane
C2H6
0.75 vol%
0.02 ppm
Ethanol
C2H5OH
8333 ppm
0.22 ppm*
Ethyl Acetate
C4H8O2
0.53 vol%
0.11 ppm
Fluorine
F2
1.6 ppm
0.04 ppm
Hydrogen
H2
500 ppm
0.80 ppm
Hydrogen Bromide
HBr
9.0 ppm
0.04 ppm
Hydrogen Chloride
HCl
3.2 ppm
0.06 ppm
Hydrogen Sulfide
H2S
25.0 ppm
0.09 ppm
Isobutane
i-C4H10
0.45 vol%
0.05 ppm
Isobuten
C4H8
1000 ppm
27.19 ppm
Isopropyl Alcohol
C3H8O
0.50 vol%
0.63 ppm
Methane
CH4
1.26 vol%
0.09 ppm
Methanol
CH3OH
1.38 vol%
2.32 ppm*
Methyl Ethyl Ketone
C4H8O
0.45 vol%
1.09 ppm
Methyl Isobutyl Ketone
C6H12O
0.30 vol%
0.20 ppm
Methyl Methacrylate
C5H8O2
4250 ppm
0.13 ppm
GX-3R Pro (TIIS Version) Operator’s Manual
Appendix D: Interference Information • 201
Table 16: Interference Chart for ESR-A13D-SO2, SO2 Detection
Gas
Chemical
Formula
Concentration
Indication
Value
n-Hexane
n-C6H14
0.30 vol%
0.02 ppm
Nitrogen Dioxide
NO2
5.0 ppm
-5.01 ppm
Nitrogen Monoxide
NO
99.2 ppm
3.13 ppm
Nonane
n-C9H2O
0.18 vol%
0.01 ppm
Ozone
O3
0.48 ppm
-0.30 ppm
Phosphine
PH3
2.51 ppm
0.02 ppm
Propane
C3H8
0.49 vol%
0.01 ppm
Propylene
C3H6
0.5 vol%
48.27 ppm
Tetrahydrofuran
C4H8O
0.50 vol%
0.90 ppm*
Toluene
C7H8
1.0 vol%
0.46 ppm*
Xylene
C8H10
1.0 vol%
0.12 ppm*
*
The indicated value may fluctuate when exposed to this gas.
202 • Appendix D: Interference Information
GX-3R Pro (TIIS Version) Operator’s Manual
ESR-A13i-H2S, H2S Detection
Table 17: Interference Chart for ESR-A13i-H2S, H2S Detection
Gas
Chemical
Formula
Concentration
Indication
Value
Acetone
C3H6O
0.54 vol%
0.0 ppm
Acetylene
C2H2
100 ppm
0.0 ppm
Ammonia
NH3
38.6 ppm
0.0 ppm
Benzene
C6H6
0.30 vol%
0.0 ppm
Carbon Dioxide
CO2
20.0 vol%
0.0 ppm
Carbon Monoxide
CO
100.0 ppm
0.2 ppm
Chlorine
CL2
2.0 ppm
0.0 ppm
Cyclopentane
C5H10
0.35 vol%
0.0 ppm
Ethane
C2H6
0.75 vol%
0.0 ppm*
Ethanol
C2H5OH
0.83 vol%
-0.5 ppm*
Ethyl Acetate
C4H8O2
0.53 vol%
-0.1 ppm*
Fluorine
F2
1.6 ppm
0.0 ppm
Hydrogen
H2
500 ppm
0.2 ppm
Hydrogen Bromide
HBr
9.0 ppm
0.0 ppm
Hydrogen Chloride
HCl
3.2 ppm
0.0 ppm
Isobutane
i-C4H10
0.45 vol%
0.0 ppm
Isobuten
C4H8
1000 ppm
0.1 ppm
Isopropyl Alcohol
C3H8O
2.0 vol%
-0.5 ppm
Methane
CH4
1.26 vol%
0.0 ppm
Methanol
CH3OH
1.38 vol%
-0.6 ppm*
Methyl Ethyl Ketone
C4H8O
0.45 vol%
0.0 ppm
Methyl Isobutyl Ketone
C6H12O
0.30 vol%
0.0 ppm
Methyl Methacrylate
C5H8O2
0.43 vol%
0.1 ppm*
n-Hexane
n-C6H14
0.30 vol%
0.0 ppm
GX-3R Pro (TIIS Version) Operator’s Manual
Appendix D: Interference Information • 203
Table 17: Interference Chart for ESR-A13i-H2S, H2S Detection
Gas
Chemical
Formula
Concentration
Indication
Value
Nitrogen Dioxide
NO2
5.0 ppm
-0.4 ppm
Nitrogen Monoxide
NO
99.2 ppm
2.6 ppm
Nonane
n-C9H2O
0.18 vol%
0.0 ppm
Ozone
O3
0.48 ppm
0.0 ppm
Phosphine
PH3
2.51 ppm
1.0 ppm
Propane
C3H8
0.49 vol%
0.0 ppm
Propylene
C3H6
0.5 vol%
-0.2 ppm
Sulfur Dioxide
SO2
25.0 ppm
0.0 ppm
Tetrahydrofuran
C4H8O
0.50 vol%
-0.4 ppm
Toluene
C7H8
1.0 vol%
0.0 ppm
Xylene
C8H10
0.25 vol%
0.0 pm
*
The indicated value may fluctuate when exposed to this gas.
204 • Appendix D: Interference Information
GX-3R Pro (TIIS Version) Operator’s Manual
ESR-A13P-CO, CO Detection
Table 18: Interference Chart for ESR-A13P-CO, CO Detection
Gas
Chemical
Formula
Concentration
Indication
Value
Acetone
(CH3)2CO
5380 ppm
0 ppm
Acetylene
C2 H 2
99.6 ppm
50 ppm
Ammonia
NH3
255 ppm
1 ppm
Arsine
AsH3
1.1 ppm
4 ppm
Benzene
C6 H6
0.3 vol%
-1 ppm
Carbon Dioxide
CO2
100 vol%
8 ppm
Chlorine
Cl2
0.8 ppm
0 ppm
Cyclopentane
C5H10
0.35 vol%
0 ppm
Diborane
B2 H6
5.25 ppm
2 ppm
Ethane
C2 H6
0.75 vol%
-1 ppm
Ethanol
CH3CH2OH
0.825 vol%
2 ppm*
Ethyl Acetate
CH3COOH2CH3
0.525 vol%
-1 ppm
Fluorine
F2
1.6 ppm
-1 ppm
Gelmane
GeH4
10.2 ppm
3 ppm
Hydrogen
H2
100 ppm
11 ppm
Hydrogen Chloride
HCl
11.7 ppm
-1 ppm
Hydrogen Cyanide
HCN
1.8 ppm
-1 ppm
Hydrogen Selenide
H2Se
1 ppm
1 ppm
Hydrogen Sulfide
H2 S
30 ppm
0 ppm
Isobutane
C4H10
0.45 vol%
-1 ppm
Isobuten
(CH3)2C=CH2
1000 ppm
2 ppm
Isopropyl Alcohol
(CH3)2CHOH
0.5 vol%
-1 ppm
Methane
CH4
1.25 vol%
0 ppm
Methanol
CH3OH
1000 ppm
3 ppm
Methyl Ethyl Ketone
C 4 H8 O
0.45 vol%
-1 ppm
GX-3R Pro (TIIS Version) Operator’s Manual
Appendix D: Interference Information • 205
Table 18: Interference Chart for ESR-A13P-CO, CO Detection
Gas
Chemical
Formula
Concentration
Indication
Value
Methyl Isobutyl Ketone
C6H12O
3000 ppm
-1 ppm
Methyl Methacrylate
C5H8O2
0.425 vol%
0 ppm
n-Heptane
CH3(CH2)5CH3
0.275 vol%
-1 ppm
n-Hexane
CH3(CH2)4CH3
0.3 vol%
0 ppm
Nitrogen Dioxide
NO2
50.5 ppm
1 ppm
Nitrogen Monoxide
NO
99.2 ppm
53 ppm
Nonane
CH3(CH2)7CH3
0.175 vol%
0 ppm
Ozone
O3
1.8 ppm
0 ppm
Phosphine
PH3
2.5 ppm
3 ppm
Propane
C3 H8
0.5 vol%
0 ppm
Propylene
C3 H6
5000 ppm
16 ppm
Silane
SiH4
29.9 ppm
27 ppm
Sulfur Dioxide
SO2
30 ppm
0 ppm
Tetrahydrofuran
C4 H 8 O
0.5 vol%
0 ppm
Toluene
C6H5CH3
3000 ppm
0 ppm
Xylene
C6H4(CH3)2
2500 ppm
0 ppm
*
The indicated value may fluctuate when exposed to this gas.
206 • Appendix D: Interference Information
GX-3R Pro (TIIS Version) Operator’s Manual
ESR-A1CP-COH, H2-Compensated CO Detection
Table 19: Interference Chart for ESR-A1CP-COH, H2-Compensated CO Detection
Gas
Chemical
Formula
Concentration
Indication
Value
Acetone
C3 H 6 O
0.54 vol%
1 ppm
Acetylene
C2 H 2
100 ppm
109 ppm
Ammonia
NH3
38.6 ppm
0 ppm
Benzene
C6 H6
0.30 vol%
0 ppm
Carbon Dioxide
CO2
20.0 vol%
0 ppm
Chlorine
Cl2
2.0 ppm
-1 ppm
Cyclopentane
C5H10
0.35 vol%
1 ppm
Ethane
C2 H6
0.75 vol%
0 ppm
Ethanol
C2H5OH
0.83 vol%
4 ppm*
Ethyl Acetate
C4 H8 O2
0.53 vol%
1 ppm
Fluorine
F2
1.6 ppm
-1 ppm
Hydrogen
H2
500 ppm
7 ppm
Hydrogen Bromide
HBr
9.0 ppm
0 ppm
Hydrogen Chloride
HCl
15.8 ppm
0 ppm
Hydrogen Sulfide
H2 S
24.2 ppm
0 ppm
Isobutane
i-C4H10
0.45 vol%
0 ppm
Isobuten
C4 H 8 O
1000 ppm
3 ppm
Isopropyl Alcohol
C3 H 8 O
0.50 vol%
0 ppm
Nitrogen Monoxide
NO
99.2 ppm
53 ppm
Nitrogen Dioxide
NO2
50.5 ppm
0 ppm
Methane
CH4
1.26 vol%
1 ppm
Methanol
CH3OH
1.38 vol%
131 ppm*
Methyl Ethyl Ketone
C 4 H8 O
0.45 vol%
0 ppm
Methyl Isobutyl Ketone
C6H12O
0.30 vol%
0 ppm
GX-3R Pro (TIIS Version) Operator’s Manual
Appendix D: Interference Information • 207
Table 19: Interference Chart for ESR-A1CP-COH, H2-Compensated CO Detection
Gas
Chemical
Formula
Concentration
Indication
Value
Methyl Methacrylate
C5 H 8 O 2
0.43 vol%
1 ppm
n-Hexane
n-C6H14
0.30 vol%
1 ppm
Nonane
n-C9H2O
0.18 vol%
0 ppm
Ozone
O3
0.48 ppm
0 ppm
Phosphine
PH3
2.51 ppm
3 ppm
Propane
C3 H8
0.49 vol%
0 ppm
Propylene
C3 H6
0.50 vol%
78 ppm*
Sulfur Dioxide
SO2
25.0 ppm
1 ppm
Tetrahydrofuran
C4 H 8 O
0.50 vol%
1 ppm
Toluene
C7 H8
0.30 vol%
1 ppm
Xylene
C8H10
0.25 vol%
0 ppm
*
The indicated value may fluctuate when exposed to this gas.
208 • Appendix D: Interference Information
GX-3R Pro (TIIS Version) Operator’s Manual
ESR-A1DP-COHS, CO Detection
Table 20: Interference Chart for ESR-A1DP-COHS, CO Detection
Gas
Chemical
Formula
Concentration
Indication
Value
Acetone
(CH3)2CO
0.538 vol%
-1 ppm
Acetylene
C2 H 2
99.6 ppm
84 ppm
Ammonia
NH3
255 ppm
2 ppm
Arsine
AsH3
1.1 ppm
4 ppm
Benzene
C6 H6
0.3 vol%
-1 ppm
Carbon Dioxide
CO2
100 vol%
8 ppm
Chlorine
Cl2
0.8 ppm
-1 ppm
Cyclopentane
C5H10
0.35 vol%
0 ppm
Diborane
B2 H6
5.25 ppm
2 ppm
Ethane
C2 H6
0.75 vol%
0 ppm
Ethanol
CH3CH2OH
0.825 vol%
25 ppm*
Ethyl Acetate
CH3COOH2CH3
0.525 vol%
9 ppm*
Fluorine
F2
1.6 ppm
0 ppm
Gelmane
GeH4
10.2 ppm
7 ppm
Hydrogen
H2
100 ppm
17 ppm
Hydrogen Chloride
HCl
11.7 ppm
-1 ppm
Hydrogen Cyanide
HCN
1.8 ppm
-1 ppm
Hydrogen Selenide
H2Se
1 ppm
2 ppm
Hydrogen Sulfide
H2 S
30 ppm
2 ppm
Isobutane
C4H10
0.45 vol%
0 ppm
Isobuten
(CH3)2C=CH2
1000 ppm
9 ppm
Isopropyl Alcohol
(CH3)2CHOH
0.5 vol%
15 ppm*
Methane
CH4
1.25 vol%
-1 ppm
Methanol
CH3OH
1000 ppm
10 ppm*
Methyl Ethyl Ketone
C 4 H8 O
0.45 vol%
-1 ppm
GX-3R Pro (TIIS Version) Operator’s Manual
Appendix D: Interference Information • 209
Table 20: Interference Chart for ESR-A1DP-COHS, CO Detection
Gas
Chemical
Formula
Concentration
Indication
Value
Methyl Isobutyl Ketone
C6H12O
0.3 vol%
0 ppm
Methyl Methacrylate
C5 H 8 O 2
0.425 vol%
2 ppm
n-Heptane
CH3(CH2)5CH3
0.275 vol%
-1 ppm
n-Hexane
CH3(CH2)4CH3
0.3 vol%
0 ppm
Nitrogen Dioxide
NO2
50.5 ppm
1 ppm
Nitrogen Monoxide
NO
99.2 ppm
38 ppm
Nonane
CH3(CH2)7CH3
0.175 vol%
0 ppm
Ozone
O3
1.8 ppm
0 ppm
Phosphine
PH3
2.5 ppm
3 ppm
Propane
C3 H8
0.5 vol%
0 ppm
Propylene
C3 H6
0.5 vol%
42 ppm*
Silane
SiH4
29.9 ppm
46 ppm
Sulfur Dioxide
SO2
30 ppm
3 ppm
Tetrahydrofuran
C4 H 8 O
0.5 vol%
21 ppm
Toluene
C6H5CH3
0.3 vol%
0 ppm
Xylene
C6H4(CH3)2
0.25 vol%
0 ppm
*
The indicated value may fluctuate when exposed to this gas.
210 • Appendix D: Interference Information
GX-3R Pro (TIIS Version) Operator’s Manual
ESR-A1DP-COHS, H2S Detection
Table 21: Interference Chart for ESR-A1DP-COHS, H2S Detection
Gas
Chemical
Formula
Concentration
Indication
Value
Acetone
CH3COCH3
0.538 vol%
-0.1 ppm
Acetylene
C2H2
99.6 ppm
-0.1 ppm
Ammonia
NH3
250 ppm
-0.1 ppm
Arsine
AsH3
1.1 ppm
0.5 ppm
Benzene
C6H6
0.3 vol%
-0.1 ppm
Carbon Dioxide
CO2
100 vol%
-0.1 ppm
Carbon Monoxide
CO
1000 ppm
2.6 ppm
Chlorine
Cl2
0.8 ppm
-0.1 ppm
Cyclopentane
C5H10
0.35 vol%
-0.1 ppm
Diborane
B2H6
5.25 ppm
0.2 ppm
Ethane
C2H6
0.75 vol%
0.0 ppm
Ethanol
CH3CH2OH
0.825 vol%
0.5 ppm
Ethyl Acetate
CH3COOH2CH3
0.525 vol%
-0.1 ppm
Fluorine
F2
1.6 ppm
-0.1 ppm
Gelmane
GeH4
10.2 ppm
0.3 ppm
Hydrogen
H2
2000 ppm
1.3 ppm
Hydrogen Chloride
HCl
11.7 ppm
-0.2 ppm
Hydrogen Cyanide
HCN
1.8 ppm
0.0 ppm
Hydrogen Selenide
H2Se
1 ppm
0.3 ppm
Isobutane
C4H10
0.45 vol%
-0.1 ppm
Isobuten
CH2CH(CH3)2
1000 ppm
0.1 ppm
Isopropyl Alcohol
CH3C(OH)CH3
0.5 vol%
0.0 ppm
Methane
CH4
1.25 vol%
-0.1 ppm
Methanol
CH3OH
1.375 vol%
0.5 ppm
GX-3R Pro (TIIS Version) Operator’s Manual
Appendix D: Interference Information • 211
Table 21: Interference Chart for ESR-A1DP-COHS, H2S Detection
Gas
Chemical
Formula
Concentration
Indication
Value
Methyl Ethyl Ketone
C4H8O
0.45 vol%
0.3 ppm
Methyl Isobutyl Ketone
C6H12O
0.3 vol%
-0.1 ppm
Methyl Methacrylate
C5H8O2
0.425 vol%
-0.1 ppm
n-Heptane
CH3(CH2)5CH3
0.275 vol%
-0.1 ppm
n-Hexane
CH3(CH2)4CH3
0.3 vol%
-0.1 ppm
Nitrogen Dioxide
NO2
50.5 ppm
-4.6 ppm
Nitrogen Monoxide
NO
99.2 ppm
6.0 ppm
Nonane
CH3(CH2)7CH3
0.175 vol%
0.2 ppm
Ozone
O3
1.8 ppm
-0.1 ppm
Phosphine
PH3
2.5 ppm
1.5 ppm
Propane
C3H8
0.5 vol%
-0.1 ppm
Propylene
C3H6
0.5 vol%
-0.1 ppm
Silane
SiH4
29.9 ppm
0.6 ppm
Sulfur Dioxide
SO2
30 ppm
-0.1 ppm
Tetrahydrofuran
C4H8O
0.5 vol%
0.1 ppm
Toluene
C6H5CH3
0.3 vol%
-0.1 ppm
Xylene
C6H5(CH3)2
0.25 vol%
-0.1 ppm
212 • Appendix D: Interference Information
GX-3R Pro (TIIS Version) Operator’s Manual
ESR-B134-NH3, NH3 Detection
Table 22: Interference Chart for ESR-B134-NH3, NH3 Detection
Gas
Chemical
Formula
Concentration
Indication
Value
Carbon Dioxide
CO2
1 vol%
0.3 ppm
Carbon Monoxide
CO
50 ppm
0.7 ppm
Chlorine
Cl2
0.8 ppm
1.1 ppm
Ethanol
C2H5OH
0.83 vol%
5.4 ppm
Hydrogen
H2
500 ppm
0.7 ppm
Hydrogen Chloride
HCl
8 ppm
0.5 ppm
Hydrogen Cyanide
HCN
8.0 ppm
2.5 ppm
Hydrogen Sulfide
H2S
30 ppm
0.6 ppm
Isobutane
C4H10
0.89 vol%
0.9 ppm
Methane
CH4
2.21 vol%
1.0 ppm
Nitric Oxide
NO
101 ppm
0.8 ppm
Nitrogen Dioxide
NO2
99 ppm
-23.9 ppm
Oxygen
O2
100 vol%
0.4 ppm
Ozone
O3
0.3 ppm
8.5 ppm
Phosphine
PH3
0.5 ppm
1.0 ppm
Sulfur Dioxide
SO2
30 ppm
1.0 ppm
GX-3R Pro (TIIS Version) Operator’s Manual
Appendix D: Interference Information • 213
Warranty
RKI Instruments, Inc. warrants the GX-3R Pro sold by us to be free from defects in materials,
workmanship, and performance for a period of three years from the date of shipment from RKI
Instruments, Inc. Original NH3 sensors are warranted for 1 year, and all other original sensors are
warranted for 3 years. Replacement parts (except sensors) are warranted for 1 year from the date
of their shipment from RKI Instruments, Inc. Replacement NH3 sensors are warranted for 1 year,
and all other replacement sensors are warranted for 3 years. Any parts found defective within
their warranty period will be repaired or replaced, at our option, free of charge. This warranty
does not apply to those items which by their nature are subject to deterioration or consumption in
normal service, and which must be cleaned, repaired, or replaced on a routine basis. Examples of
such items are:
• Absorbent cartridges
• Filter elements, disks, or sheets
• Pump diaphragms and valves
Warranty is voided by abuse including mechanical damage, alteration, rough handling, or repair
procedures not in accordance with the instruction manual. This warranty indicates the full extent
of our liability, and we are not responsible for removal or replacement costs, local repair costs,
transportation costs, or contingent expenses incurred without our prior approval.
THIS WARRANTY IS EXPRESSLY IN LIEU OF ANY AND ALL OTHER WARRANTIES AND
REPRESENTATIONS, EXPRESSED OR IMPLIED, AND ALL OTHER OBLIGATIONS OR
LIABILITIES ON THE PART OF RKI INSTRUMENTS, INC. INCLUDING BUT NOT LIMITED TO
THE WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. IN NO
EVENT SHALL RKI INSTRUMENTS, INC. BE LIABLE FOR INDIRECT, INCIDENTAL, OR
CONSEQUENTIAL LOSS OR DAMAGE OF ANY KIND CONNECTED WITH THE USE OF ITS
PRODUCTS OR FAILURE OF ITS PRODUCTS TO FUNCTION OR OPERATE PROPERLY.
This warranty covers instruments and parts sold to users only by authorized distributors, dealers,
and representatives as appointed by RKI Instruments, Inc.
We do not assume indemnification for any accident or damage caused by the operation of this gas
monitor and our warranty is limited to replacement of parts or our complete goods.
214 • Warranty
GX-3R Pro (TIIS Version) Operator’s Manual
*;53UR
Explosion proof structure
(GX-3R Pro/BUL-3R/BUD-3R)
Explosion proof class
(GX-3R Pro/BUL-3R/BUD-3R)
Certificate number
Intrinsically safe explosion-proof construction
Rating
GX-3R Pro
Buzzer circuit:㻌 Allowable voltage 4.2 V, allowable current 0.556 A,
allowable power 0.379 W
Main circuit:
Allowable voltage 5.4 V, allowable current 1.206 A,
allowable power 0.825 W
Motor circuit: Allowable voltage 4.2 V, allowable current 0.152 A,
allowable power 0.124 W
ECRI circuit: Allowable voltage 5.4 V, allowable current 1.222 A,
allowable power 0.866 W
BUL-3R
Buzzer circuit: Allowable voltage 4.2 V, allowable current 0.259 A,
allowable power 0.272 W
Main circuit:
Allowable voltage 4.2 V, allowable current 0.786 A,
allowable power 0.825 W
Motor circuit: Allowable voltage 4.2 V, allowable current 0.118 A,
allowable power 0.124 W
ECRI circuit: Allowable voltage 4.2 V, allowable current 0.825 A,
allowable power 0.866 W
Battery charging contact allowable voltage: 6.3 V DC (with SELV
power supply only)
BUD-3R
Buzzer circuit: Maximum voltage 3.3 V, maximum current 0.556 A,
maximum power 0.379 W
Main circuit:
Maximum voltage 5.4 V, maximum current 1.206 A,
maximum power 0.822 W
Motor circuit:
Maximum voltage 3.3 V, maximum current 0.152 A,
maximum power 0.104 W
ECRI circuit:
Maximum voltage 5.4 V, maximum current 1.222 A,
maximum power 0.833 W
3.0 V DC, 250 mA (Toshiba LR03 battery × 2)
-40°C to +60°C
Power supply
Ambient temperature range*
(GX-3R Pro/BUL-3R/BUD-3R)
Ambient temperature range
(for charging)
(GX-3R Pro/BUL-3R)
Lists of standards
(GX-3R Pro/BUL-3R/BUD-3R)
Ex ia IIC T4 Ga
GX-3R Pro : DEK18.0016
BUL-3R
: DEK18.0017
BUD-3R
: DEK18.0018
0°C to +40°C
JNIOSH-TR-46-1䠖2015
JNIOSH-TR-46-6䠖2015
* Ambient temperature refers to the temperature range in which the explosion-proof performance
can be maintained. It does not refer to the temperature range in which product performance is
guaranteed. For the range of operating temperatures, see “Table 4: GX-3R Pro Specifications”
starting on page 12.
GX-3R Pro (TIIS Version) Operator’s Manual
Warranty • 215
‒
x
x
x
x
x
x
DANGER
Replace the lithium ion battery unit promptly (Within 10 minutes) only in a safe place.
Charge the battery using the provided charger in a safe place.
Charge the battery at ambient temperatures between 0 °C and 40 °C.
The dry battery unit must be replaced promptly (Within 10 minutes) only in a safe place.
The batteries must be replaced only in a safe place.
Be sure to use only the specified batteries.
WARNING
x Do not modify or alter the circuitry or configuration.
x When measuring oxygen concentrations, do not measure anything but mixtures of air
and combustible or toxic gases.
x When using the product in hazardous areas, take the following precautions to safeguard
against static electricity hazards:
ᬅ Wear anti-static clothing and conductive shoes (anti-static work shoes).
ղ When using the product indoors, stand on a conductive work floor
(with a leakage resistance of 10 Mȍ or less).
216 • Warranty
GX-3R Pro (TIIS Version) Operator’s Manual