71 0239RK
GX-2012
Operator’s Manual, CSA Version
Part Number: 71-0239RK
Revision: P
Released: 3/25/16
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.
Periodic calibration and maintenance of the gas
monitor is essential for proper operation and
correct readings. Please calibrate and maintain
this instrument regularly! Frequency of
calibration depends upon the type of use you
have and the sensor types. Typical calibration
frequencies for most applications are between 1
and 3 months, but can be required more often or
less often based on your usage.
GX-2012 Operator’s Manual, CSA Version
Warranty
RKI Instruments, Inc. warrants the GX-2012 sold by us to be free from
defects in materials, workmanship, and performance for a period of two years
from the date of shipment from RKI Instruments, Inc. This includes the
instrument and the original sensors. Replacement parts are warranted for 1
year from the date of their shipment from RKI Instruments, Inc. except for
replacement sensors which are warranted for 2 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.
Warranty
GX-2012 Operator’s Manual, CSA Version
Table of Contents
Chapter 1: Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
About the GX-2012 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
About This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1
1
3
4
Chapter 2: Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Instrument Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
LCD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Control Buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Printed Circuit Boards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Alarm LED Arrays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Infrared Communications Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Buzzer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Vibrator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Batteries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Flow Chamber . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Sensors and Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Inlet Filter Holder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Standard Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Tapered Rubber Nozzle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Belt Clip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Wrist Strap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Sample Hose & 10 Inch Probe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Optional Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Charging Stations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Optional Probes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Purge Tee Fitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
External Dilution Fitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
GX-2012 Operator’s Manual, CSA Version
Table of Contents
Chapter 3: Using the GX-2012 in Normal Mode . . . . . . . . . . . . . 19
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Start Up, Normal Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Turning On the GX-2012, Normal Mode Only . . . . . . . . . . . . . . . .
Turning On the GX-2012 in Normal With All Modes Active . . . . .
Performing a Fresh Air Adjustment, Normal Mode. . . . . . . . . . . . .
Turning Off the GX-2012, Normal Mode . . . . . . . . . . . . . . . . . . . . .
Measuring Mode, Normal Operation . . . . . . . . . . . . . . . . . . . . . . . . . .
Monitoring an Area. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Using Optional Probes and Fittings . . . . . . . . . . . . . . . . . . . . . . . . .
Combustible Gas Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Snap Log Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Measuring Mode, Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Alarm Indications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Resetting and Silencing Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Responding to Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inert Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Start Up and Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Display Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
HC Range Screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Peak Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
STEL Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TWA Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Alarm Points Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operation Time Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Date/Time Screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Remaining Log Time Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Clear Data Logger Screens . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pump Off Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
User ID Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Station ID Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Snap Logging Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Peak Bar Select Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Datalogging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SDM-2012 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Calibration Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Calibration/Bump Test Supplies and Equipment . . . . . . . . . . . . . . .
Table of Contents
19
19
19
25
27
28
28
28
29
31
33
36
36
38
39
42
42
42
43
43
44
45
45
45
47
47
51
49
50
51
52
53
55
56
56
57
57
GX-2012 Operator’s Manual, CSA Version
Preparing for Calibration or Bump Test . . . . . . . . . . . . . . . . . . . . . . 58
Calibrating the GX-2012. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Bump Testing the GX-2012. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Chapter 4: Using the GX-2012 in Bar Hole Mode . . . . . . . . . . . . 73
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Start Up, Bar Hole Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Turning On the GX-2012, Bar Hole Mode . . . . . . . . . . . . . . . . . . . .
Performing a Fresh Air Adjustment, Bar Hole Mode . . . . . . . . . . . .
Bar Hole Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Performing a Bar Hole Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Turning Off the GX-2012, Bar Hole Mode . . . . . . . . . . . . . . . . . . . .
73
73
73
79
80
80
83
Chapter 5: Using the GX-2012 in Leak Check Mode . . . . . . . . . 84
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Start Up, Leak Check Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Turning on the GX-2012, Leak Check Mode . . . . . . . . . . . . . . . . . . .
Performing a Fresh Air Adjustment, Leak Check Mode . . . . . . . . . .
Leak Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Setting the Display Range Value. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Locating a Leak . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Overscale Conditions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Turning the Alarm On and Off in Leak Check Mode . . . . . . . . . . . .
Peak Hold Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Snap Log Mode, Leak Check Mode Operation. . . . . . . . . . . . . . . . . .
Viewing Snap Log Data in Leak Check Mode Operation . . . . . . . . .
Turning Off the GX-2012, Leak Check Mode . . . . . . . . . . . . . . . . . .
84
84
84
90
90
91
91
92
93
93
94
96
99
Chapter 6: Maintenance Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tips for Using Maintenance Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Using Maintenance Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Updating the Date and Time Settings. . . . . . . . . . . . . . . . . . . . . . .
Performing a Fresh Air Adjustment . . . . . . . . . . . . . . . . . . . . . . . .
Calibrating Using Auto Calibration . . . . . . . . . . . . . . . . . . . . . . . .
Calibration Using Single Calibration . . . . . . . . . . . . . . . . . . . . . . .
Performing a Bump Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Turning the Lunch Break Setting On or Off . . . . . . . . . . . . . . . . . .
GX-2012 Operator’s Manual, CSA Version
100
101
101
103
103
105
108
111
116
Table of Contents
Updating the Alarm Latching Settings. . . . . . . . . . . . . . . . . . . . . .
Updating the Alarm Silence Settings . . . . . . . . . . . . . . . . . . . . . . .
Updating the Data Logging Interval. . . . . . . . . . . . . . . . . . . . . . . .
Updating the Alarm Point Settings . . . . . . . . . . . . . . . . . . . . . . . .
Turning the Clear Data Logger Screen On or Off. . . . . . . . . . . . . .
Turning the Bump Test Function On or Off . . . . . . . . . . . . . . . . . .
Turning the Pump Off Screen On or Off . . . . . . . . . . . . . . . . . . . .
Updating the Bump Test Parameters . . . . . . . . . . . . . . . . . . . . . . .
Updating the Confirmation Beep Setting . . . . . . . . . . . . . . . . . . . .
Updating the DataLog Overwrite Setting . . . . . . . . . . . . . . . . . . .
Updating the Calibration Interval. . . . . . . . . . . . . . . . . . . . . . . . . .
Updating the Calibration Reminder Setting . . . . . . . . . . . . . . . . . .
Updating the Calibration Expired Action Setting . . . . . . . . . . . . .
Updating the Calibration Check Setting . . . . . . . . . . . . . . . . . . . . .
Updating the Bump Test Interval . . . . . . . . . . . . . . . . . . . . . . . . . .
Updating the Bump Test Reminder Setting . . . . . . . . . . . . . . . . . .
Updating the Bump Test Expired Action Setting . . . . . . . . . . . . . .
Updating the Bump Test Check Setting . . . . . . . . . . . . . . . . . . . . .
Turning the ID Display Function On or Off . . . . . . . . . . . . . . . . .
Updating the LCD Backlight Time Setting . . . . . . . . . . . . . . . . . . .
Updating the Autozero Function . . . . . . . . . . . . . . . . . . . . . . . . . .
Updating the Demand Zero Function. . . . . . . . . . . . . . . . . . . . . . .
Updating the Leak Check/Bar Hole Mode Setting. . . . . . . . . . . . . .
Updating the Bar Hole Sampling Time . . . . . . . . . . . . . . . . . . . . . .
Turning Portuguese On or Off . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Updating the Leak Check Mode CO Channel Display Setting . . . .
Viewing the ROM/SUM Information. . . . . . . . . . . . . . . . . . . . . . .
Turning the Password Function On or Off. . . . . . . . . . . . . . . . . . .
Performing a Low Flow Setpoint Adjustment . . . . . . . . . . . . . . . .
Exiting Maintenance Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
117
118
119
120
124
125
126
127
129
129
130
130
131
131
132
133
133
134
135
135
136
136
137
138
138
139
140
141
142
142
Chapter 7: Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacing or Recharging the Batteries . . . . . . . . . . . . . . . . . . . . . . . . .
Replacing Alkaline Batteries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacing the Lithium Ion Battery Pack . . . . . . . . . . . . . . . . . . . . .
Recharging the Lithium Ion Battery Pack in the Instrument . . . . .
Table of Contents
143
143
146
146
147
149
GX-2012 Operator’s Manual, CSA Version
Recharging the Lithium Ion Battery Pack Out of the Instrument .
Replacing the LEL and CO Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacing a Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacing the Hydrophobic Disk Filter, Cotton Filter,
and Wire Mesh Disk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
151
154
156
157
159
Appendix A: Calibrating and Bump Testing
with a Sample Bag . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Calibration/Bump Test Supplies & Equipment . . . . . . . . . . . . . . . . .
Preparing for Calibration or Bump Testing. . . . . . . . . . . . . . . . . . . . .
Calibrating the GX-2012 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Calibrating with the Auto Calibration Method. . . . . . . . . . . . . . . .
Calibrating with the Single Calibration Method. . . . . . . . . . . . . . .
Bump Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
162
162
163
165
166
169
172
178
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. Not tested
in oxygen enriched atmospheres (above 21%).
GX-2012 Operator’s Manual, CSA Version
Table of Contents
Chapter 1: Introduction
Overview
This chapter briefly describes the GX-2012. This chapter also describes the
GX-2012 Operator’s Manual (this document). Table 1 at the end of this
chapter lists the specifications for the GX-2012.
About the GX-2012
Using an advanced detection system consisting of up to five gas sensors, the
GX-2012 sample draw gas monitor detects the presence of combustible gas,
oxygen (O2), carbon monoxide (CO), and hydrogen sulfide (H2S)
simultaneously. The GX-2012’s compact size and easy-to-use design makes
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-2012 offers a full range of features, including:
• Simultaneous four-gas monitoring of combustible gases, O2, CO, and H2S
(in Normal Mode)
• Choice of two operating modes: Normal Mode for typical confined space
or area monitoring and Bar Hole Mode for checking of bar holes when
searching for underground gas leaks
• Sample-drawing pump with up to 50-foot range
• Liquid crystal display (LCD) for complete and understandable
information at a glance
• Distinctive audible/vibrating alarms for dangerous gas conditions and
audible alarms for unit malfunction
• Microprocessor control for reliability, ease of use, and advanced
capabilities
• Alarm trend data (when used in Normal Mode)
• Data logging functions (when used in Normal Mode)
• STEL/TWA (when used in Normal Mode) and over range alarm display
• Peak hold and average readouts (when used in Normal Mode)
• Built-in time function
• RF shielded high impact plastic case
GX-2012 Operator’s Manual, CSA Version
Overview • 1
• CSA classification for Class I, Division I, Groups A, B, C, and D
hazardous atmospheres
WARNING: The GX-2012 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-2012, 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 GX2012 as described in this manual.
NOTE: ONLY THE COMBUSTIBLE GAS DETECTION PORTION OF
THIS INSTRUMENT HAS BEEN ASSESSED FOR
PERFORMANCE.
2 • About the GX-2012
GX-2012 Operator’s Manual, CSA Version
Specifications
Table 1: GX-2012 Specifications
Target Gas
%LEL
Combustible
Gas
(Methane
Calibration
Standard)*
% Volume
Combustible
Gas
(Methane
Calibration
Standard)
Oxygen (O2)
Hydrogen
Sulfide
(H2S)
Carbon
Monoxide
(CO)
Range
(Increment)
0-100% LEL
(1% LEL)
0 - 100% vol
(1% vol)
0-40.0% vol
(0.1 vol%)
0-100 ppm
(0.5 ppm)
0-500 ppm
(1 ppm)
Leak Check
Mode
Range
(Increment)
0-5,000 ppm
(100 ppm)
N/A
N/A
N/A
N/A
± 5% of
reading or
± 2 ppm H2S
(whichever
is greater)
± 5% of
reading or
± 5 ppm
CO
(whichever
is greater)
Alarm 1
5 ppm
Alarm 1
25 ppm
Alarm 2
30 ppm
Alarm 2
50 ppm
TWA
1 ppm
TWA
25 ppm
STEL
5 ppm
STEL
200 ppm
NOTE: Detection
range is 0-5,000
ppm, but displayed
range can be set to
0-500 ppm, 0-1000
ppm, 0-2000 ppm,
or 0-5000 ppm.
Sampling
Method
Sample Draw
Response
Time
T90 Within 30 Seconds
Accuracy
± 5% of reading
or ± 2% LEL
(whichever is
greater)
± 5% of
reading or
± 2% full
scale
(whichever
is greater)
Display
Gas Alarms
(Factory
Settings)
Digital LCD Display
Alarm 1
10% LEL
None
Alarm 2
50% LEL
Operating
Temperature
& Humidity
± 0.5% O2
Alarm 1
19.5 vol%
(Decreasing)
Alarm 2
23.5 vol%
(Increasing)
-20°C to 50°C/Below 85% RH (Without Condensation)
GX-2012 Operator’s Manual, CSA Version
Specifications • 3
Safety/
Regulatory
186718
CSA classified as Intrinsically Safe. Exia. Class I, Groups A, B, C, & D.
Temperature Code T3A.
Power
Supply
Continuous
Operating
Hours
@ 25 °C
• Three AA size alkaline batteries standard
• Lithium Ion Battery Pack (3.7 VDC Nominal) optional, Direct Charging
• Alkaline Batteries: 15 Hours (Non Alarm Operation, Fully Charged)
• Lithium Ion Battery Pack: 10 Hours (Non alarm Operation, Fully Charged)
Case
High-impact Plastic with protective rubber layer, RF Shielded, Dust and
Weather Proof
Standard
Accessories
• 10 foot hose
• 10 inch probe
• Flexible 4 inch tapered rubber nozzle
Optional
Accessories
•
•
•
•
•
Dimensions
and Weight
Rechargeable Lithium-Ion Battery Pack
115 VAC Charging Station
12 VDC Charging Station
Data Logger Management Program
IrDA/USB Cable for Downloading Data to a Computer With Data Logger
Management Program Software (not needed if computer has an infrared
port)
• SDM-2012 Automatic Calibration Station & Software
• Various Probes (see “Parts List” on page 178)
Approximately 171(H) x 65(W) x 39(D) mm (5.6”H x 2.5”W x 1.5”D)
Approximately 310 g (11 oz.)
*Some versions of the GX-2012 are available with the LEL sensor factory set for HC (general
hydrocarbons) and calibrated to isobutane. Consult RKI Instruments, Inc. for further
information.
About this Manual
The GX-2012 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.
4 • About this Manual
GX-2012 Operator’s Manual, CSA Version
Chapter 2: Description
Overview
This chapter describes the GX-2012 instrument and accessories.
Instrument Description
The instrument includes the case, sensors, LCD, control buttons, printed
circuit boards, alarm LED’s, infrared communication port, buzzer, vibrator,
batteries, pump, flow chamber, and inlet filter holder.
Wrist Strap Installation Feature
Tapered
Rubber
Nozzle
Inlet Filter
Holder
Inlet Fitting
Exhaust
Flow
Chamber
Buzzer
Opening
Alarm
LED
Arrays
LCD
Battery
Cover
(alkaline
version)
Control
Buttons
Charging
Contacts
AIR
DISPLAY
(ADJ)
POWER
ENTER
(SHIFT)
RESE T
SILENCE
IR Port
(behind
button label)
Figure 1: Components of the GX-2012, Front & Back
GX-2012 Operator’s Manual, CSA Version
Overview • 5
Alkaline Version
Rechargeable Version
Battery Pack
Battery Pack
Release Latch
Battery Cover
Release Knob
Figure 2: Components of the GX-2012, Bottom
Case
The Model GX-2012’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 weather resistant. A rubber layer
on the outside of the case protects it from scratches and impact damage.
A clear plastic window through which the LCD can be viewed is located on
the front of the case. Four brass charging contacts that are used when the GX2012 is placed in the charging station are on the back of the case. Both the
rechargeable and alkaline versions include a removable battery pack. The
battery pack release latch is on the bottom. The alkaline battery version also
includes a battery cover release knob. The battery pack and flow chamber are
located on the back of the GX-2012. The inlet filter holder is located on the
top of the GX-2012 case.
Sensors
The GX-2012 uses up to five sensors to monitor combustible gas, oxygen
(O2), carbon monoxide (CO), and hydrogen sulfide (H2S) simultaneously.
The sensors are located inside the GX-2012 and are held in their sockets by
the flow chamber. The sensors use different detection principles, as described
below.
6 • Instrument Description
GX-2012 Operator’s Manual, CSA Version
Combustible Gas Sensors
% LEL/ppm Sensor (NC-6264B)
The % LEL/ppm sensor detects combustible gas in the % LEL and ppm
range. It uses a catalytic element for detection. The reaction of gas with
oxygen on the catalyst causes a change in the resistance of the element which
affects the current flowing through it. The current is amplified by the GX2012’s circuitry, converted to a measurement of combustible gas
concentration, and displayed on the LCD.
%Volume Sensor (TE-7561)
The % volume sensor detects combustible gas in the % volume range. It uses
a thermal conductivity (TC) element for detection. The presence of
combustible gas cools the element causing a change in the resistance of the
element which affects the current flowing through it. The current is amplified
by the GX-2012’s circuitry, converted to a measurement of combustible gas
concentration, and displayed on the LCD.
Oxygen Sensor
The O2 sensor is a galvanic type of sensor. A membrane covers the cell and
allows gas to diffuse into the cell at a rate proportional to the partial pressure
of oxygen. The oxygen reacts in the cell and produces a voltage proportional
to the concentration of oxygen. The voltage is measured by the GX-2012’s
circuitry, converted to a measurement of gas concentration, and displayed on
the LCD.
CO and H2S Sensors
The CO and H2S 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 current is amplified by the GX2012’s circuitry, converted to a measurement of gas concentration, and
displayed on the LCD.
GX-2012 Operator’s Manual, CSA Version
Instrument Description • 7
Dummy Sensors
Any unit that has less than 5 sensors will have a dummy sensor installed in
one or more sensor positions. Dummy sensors are factory installed. The flat
top of the dummy sensor should face up and the bottom hollow side should
face down. The unit shown below is a standard 4-sensor unit for LEL/O2/
H2S/CO and has a dummy sensor installed in the %volume combustible
sensor position.
Dummy Sensor
Top Flat
Side
Bottom
Hollow Side
Figure 3: Dummy Sensor
LCD
A digital LCD (liquid crystal display) is visible through a clear plastic
window on the front of the case. The LCD display simultaneously shows the
gas reading for all installed sensors. The display also shows information for
each of the GX-2012’s program modes.
8 • Instrument Description
GX-2012 Operator’s Manual, CSA Version
Control Buttons
Five control buttons are located below the LCD. They are arranged around a
central button, the POWER ENTER button. The DISPLAY (ADJ) button is
on the left, the RESET SILENCE button on the right, the AIRS button on
the top, and the (SHIFT)T is on the bottom.
Table 2: GX-2012 Control Button Functions
Button
Function(s)
POWER ENTER
• turns the GX-2012 on and off.
• used during setup and calibration.
RESET SILENCE
silences and resets audible alarm if the GX-2012 is programmed
for latching alarms and the alarm silence option is on 1
DISPLAY (ADJ)
AIRS
(SHIFT)T
• activates Display Mode
• enters instructions into the GX-2012’s microprocessor
• activates the demand-zero function (automatically adjusts the
GX-2012 in fresh-air conditions)
• scrolls through the display and settings modes
• scrolls through the display and settings modes
• enters instructions into the GX-2012’s microprocessor
1 The GX-2012’s alarms are user-adjustable. See “Chapter 6: Maintenance Mode” on page 100.
Printed Circuit Boards
The GX-2012 printed circuit boards analyze, record, control, store, and
display the information collected. The circuit boards are located inside the
case. They are not user serviceable.
Alarm LED Arrays
Three red alarm LED (light emitting diode) arrays are visible through frosted
plastic lenses in the case. One is on the top front, one on the left side, and one
on the right side. The alarm LED arrays alert you to gas, low battery, and
failure alarms.
Infrared Communications Port
An infrared (IR) communications port is located just below the RESET
SILENCE button. The signal goes through the control button material. The
data transmitted through the port is in standard IrDA protocol. A computer’s
infrared port or an IrDA/USB cable connected to a computer’s USB port can
be used to download data saved by the GX-2012 to a computer using the GX2012 Data Logger Management Program. See the GX-2012 Data Logger
Management Program operator’s manual for data logging and downloading
instructions.
GX-2012 Operator’s Manual, CSA Version
Instrument Description • 9
Buzzer
One solid-state electronic buzzer is located inside the case. Holes on the top
front of the case allow the sound to exit the case. The buzzer sounds for gas
alarms, malfunctions, low battery voltage, and as an indicator during use of
the GX-2012’s many display and adjustment options.
Vibrator
A vibrating motor inside the GX-2012 case vibrates for gas alarms, unit
malfunctions, and as an indicator during normal use of the various modes of
the GX-2012.
Batteries
Three AA-size alkaline batteries (standard) or an optional rechargeable
lithium ion battery pack (3.7 VDC) power the GX-2012. Instrument run time
is dependent upon battery type. At 25°C the alkaline batteries last up to 15
hours and the lithium ion battery pack lasts up to 10 hours. The battery icon
in the upper right of the LCD shows remaining battery life.
When the GX-2012 detects a low battery voltage, a low battery warning is
activated. When battery voltage is too low for normal operation, the GX2012 sounds a dead battery alarm.
The alkaline batteries can be replaced by removing the battery cover on the
back of the case. The lithium ion pack can be replaced by removing the entire
battery pack. Push the battery pack latch on the bottom of the unit toward the
front of the unit to release the pack.
The lithium ion battery pack can be recharged by placing the GX-2012 in its
optional battery charging station or by placing the battery pack in the
charging station.
NOTE: Use of batteries or battery chargers not specified by RKI
Instruments, Inc. will void the CSA classification and may void the
warranty. See “Replacing or Recharging the Batteries” on page 146.
WARNING: To prevent ignition of a hazardous atmosphere, batteries
must only be changed or charged in an area known to be
nonhazardous.
AVERTISSEMENT:Pour éviter l’inflammation d’une atmosphère
dangereuse, les batteries doivent uniquement être modifiés
ou facturés dans une zone connue comme non dangereuse.
10 • Instrument Description
GX-2012 Operator’s Manual, CSA Version
Pump
A diaphragm pump inside the GX-2012 draws the sample to the sensors. It
can draw sample from as far as 50 feet from the GX-2012. The pump is not
user serviceable.
CAUTION: Sample hose lengths of more than 50 feet are not recommended
for the GX-2012 because of flow rate reduction.
Flow Chamber
The flow chamber is on the back of the GX-2012 and is held in place by three
phillips screws. The flow chamber seals to the rubber sensor gasket which
seals to the sensor faces inside the GX-2012 and routes flow from the pump
to the sensors and to the exhaust port (also a part of the flow chamber).
Sensors and Filters
The sensors are located underneath the flow chamber and are only accessible
if you remove the flow chamber and the sensor gasket.
An H2S removal filter disk is placed into a recess in the sensor gasket over
the %LEL sensor. It prevents H2S in the ambient air from reaching the unit’s
combustible gas sensor. Removing H2S that is present in the monitored air
prolongs the life of 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 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.
A charcoal filter is placed into a recess in the sensor gasket over the CO
sensor. The charcoal filter is black, has a woven texture, and is impregnated
with an H2S absorbing material. The CO sensor will respond if exposed to
H2S and certain hydrocarbon gases. The charcoal filter disk scrubs these
gases 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.
Inlet Filter Holder
The filter holder is a clear plastic dome shaped piece on the top of the case. A
male quick connect fitting is located on the inlet filter holder. This is the GX-
GX-2012 Operator’s Manual, CSA Version
Instrument Description • 11
2012’s inlet fitting. A cotton dust filter is inside the filter holder. The filter
holder may be removed by turning it counterclockwise and pulling it away
from the case. Two flat membrane disk hydrophobic filters, a wire mesh disk,
and a rubber filter retaining gasket are held in place by the filter holder and
are located in the bottom of the case chamber where the filter holder is
installed.
Standard Accessories
The standard accessories include the tapered rubber nozzle, belt clip, sample
hose, and 10 inch probe. An optional bar hole probe is also available and is
described at the end of this section.
Tapered Rubber Nozzle
A cone shaped 4 inch long rubber nozzle is included with the GX-2012 as
standard. It can be installed on the inlet fitting by pushing the larger end over
it. The smaller end can be inserted through a hole in a wall or some other
access to an enclosed area to sample the environment.
Belt Clip
A belt clip can be mounted to the back of the case using 3 phillips head
screws. The belt clip allows the GX-2012 to be securely attached to a belt.
Wrist Strap
A wrist strap is included with the GX-2012 and can be attached to the right or
left wrist strap installation feature.
Sample Hose & 10 Inch Probe
A 10 foot sample hose and a 10 inch probe are included as standard with the
GX-2012. When desired, the rubber nozzle may be removed and the sample
hose and 10 inch probe may be connected to the inlet fitting. Sample hose
lengths are available from 10 feet to 50 feet (see “Parts List” on page 159).
The quick connect end of the sample hose connects to the inlet fitting of the
GX-2012 and the probe screws onto the end of the hose with the threaded
fitting.
CAUTION: Sample hose lengths of more than 50 feet are not recommended
for the GX-2012 because of flow rate reduction.
12 • Standard Accessories
GX-2012 Operator’s Manual, CSA Version
Sample Hose
Probe
Figure 4: Sample Hose and Probe
Optional Accessories
Several optional accessories are available for the GX-2012. They include a
rechargeable lithium ion battery pack, charging stations, various special
probes, a purge tee fitting, and a dilution fitting. The most commonly used
optional accessories are described below. Detailed instructions regarding the
use of these and other available accessories are included in other parts of this
manual. Data logging accessories are briefly described in “Data Logging” on
page 56.
Rechargeable Lithium Ion Battery Pack
A rechargeable lithium ion battery pack is available for the GX-2012. A fully
charged battery pack will power the GX-2012 for 10 hours. The batteries will
last for a minimum of 500 charge cycles. See the “Parts List” on page 159 for
ordering information.
Charging Stations
The GX-2012 lithium ion battery pack is charged with the GX-2012 charging
station. Two battery charging stations are available for the GX-2012, the
standard AC charging station, and a DC charging station with a vehicle plug
adapter.
GX-2012 Operator’s Manual, CSA Version
Optional Accessories • 13
AC Powered Charging Station
The standard AC powered charging station consists of an instrument
charging base and an AC adapter. The AC adapter plugs into a 115 VAC wall
outlet and connects to the charging station with a jack on the end of a five
foot DC output cable. The AC adapter will also work for 100 VAC or 220
VAC if an appropriate plug adapter is provided. The AC charging station is
shown below in Figure 5.
AC Adapter
Adapter Jack
Adapter Jack
Charging
Contacts
To AC
Outlet
Charge LED
Rear View
Top View
Figure 5: GX-2012 AC Powered Charging Station
14 • Optional Accessories
GX-2012 Operator’s Manual, CSA Version
DC Powered Charging Station
An optional DC powered charging station is available with a vehicle plug 12
VDC adapter. It uses the same charging base as the AC charging station but
comes with a velcro strap to secure the GX-2012 in the charging base.
Adapter Jack
Adapter Jack
Charging
Contacts
Vehicle Plug
To Vehicle
12 VDC
Power Socket
Charge LED
Rear View
Top View
Figure 6: GX-2012 DC Powered Charging Station
GX-2012 Operator’s Manual, CSA Version
Optional Accessories • 15
Optional Probes
Various optional probes designed for specific applications are available for
the GX-2012. They include the following:
• 30 inch aluminum probe
Figure 7: 30 Inch Aluminum Probe
This probe is designed for applications where it is necessary to put the
probe tip in areas that are out of reach with the standard probe. A small
breather hole near the end of the probe tube prevents interruption of
sampling and a low flow alarm if the probe tip is blocked.
• 30 inch stainless steel probe
Figure 8: 30 Inch Stainless Steel Probe
This probe is physically the same as the 30 inch aluminum probe and is
intended for applications where a high level of corrosion resistance is
required in the long probe tube.
• Barhole probe
End Plugged
Figure 9: Barhole Probe
An optional bar hole probe is available for the GX-2012. It is designed to
be used when the GX-2012 is operated in Bar Hole Mode to check bar
holes when tracking down underground gas pipe leaks (see “Chapter 4:
Using the GX-2012 in Bar Hole Mode” on page 73). The bar hole probe
has the same handle as the standard probe, but has a 30 inch fiberglass
tube instead of the standard tube. Four holes are drilled through the 30
inch tube’s wall near the end and the end is plugged so that debris from
the barhole cannot be drawn into the tube. The sample is drawn through
the drilled holes in the tube wall.
16 • Optional Accessories
GX-2012 Operator’s Manual, CSA Version
• 32 inch telescoping probe with dust filter
Figure 10: 32 Inch Telescoping Probe with Dust Filter
This probe is designed for use where it is necessary to put the probe tip in
areas not accessible with the 10 inch probe with dust filter and
applications where the probe tube must be collapsible for storage.
• 7 foot telescoping probe with dust filter
Figure 11: 7 Foot Telescoping Probe with Dust Filter
This probe is designed for use where it is necessary to put the probe tip in
areas not accessible with the 32 inch telescoping probe with dust filter and
applications where the probe tube must be collapsible for storage.
• 8 meter hose with floating head
This probe is designed to be used in a tank or a well that may have water
or some other liquid at the bottom. As you lower the probe down, if it hits
water, it will float and continue to monitor the area.
See the “Parts List” on page 159 for probe ordering information.
GX-2012 Operator’s Manual, CSA Version
Optional Accessories • 17
Purge Tee Fitting
The 17-4430RK-01 purge fitting is used to detect gas levels in a pressurized
gas stream from a pipeline or vessel being purged. The sample port of the
purge fitting is inserted into the flowing gas, and the vent port will allow any
excess gas to release to the atmosphere to avoid damage to pump or sensors.
Pressurized
Stream
Excess
Pressurized
Sample
Sample Port
Vent Port
GX-2012 Inlet
Figure 12: Purge Tee Fitting
External Dilution Fitting
An external dilution fitting is available for the GX-2012. It is a 1:1 dilution
fitting and is designed to mate with the inlet fitting and accept a sample hose
or probe. The fittings are made with brass and nickel plated brass and are
appropriate for use with the four standard gases. The dilution fitting is
normally used when it is necessary to introduce air into a sample that has no
oxygen or a very low level of oxygen, such as a nitrogen purged sample. It
can also be used when one of the target gas levels in the sample area will
likely be present in a concentration above the detection range for that gas.
Since the fittings partially consist of unplated brass, they are not appropriate
for detection of elevated levels of H2S.
Figure 13: Dilution Fitting
18 • Optional Accessories
GX-2012 Operator’s Manual, CSA Version
Chapter 3: Using the GX-2012 in Normal Mode
Overview
This chapter explains how to operate the GX-2012 in Normal Mode. Normal
Mode is used to perform confined space entry monitoring or general area
monitoring. While in Normal Mode, Display Mode and Calibration Mode are
accessible.
If a standard version of the GX-2012 is ordered, it is shipped with Bar Hole
Mode disabled so that the instrument only runs in Normal Mode when turned
on.
Start Up, Normal Mode
This section explains how to start up the GX-2012 in Normal Mode, get it
ready for operation, and turn it off.
NOTE: The screens illustrated in this section are for a 4-gas unit that has the
% LEL range for the combustible gas channel. The screens
displayed by your GX-2012 may be slightly different.
Turning On the GX-2012, Normal Mode Only
The following description of the GX-2012 start up sequence assumes that the
following items in Maintenance Mode are turned on: LNCH BRK, ID DISP,
CL RMNDR, and BP RMNDR. If any of these items is turned off, then the
corresponding screen will not appear. This description also assumes that Bar
Hole Mode is not active.
1. Connect the tapered rubber nozzle or the sample hose to the GX-2012’s
quick connect inlet fitting.
2. If a sample hose is used, screw the probe onto the sample hose’s threaded
fitting.
3. Press and briefly hold down the POWER ENTER button. Release the
button when you hear a beep.
GX-2012 Operator’s Manual, CSA Version
Overview • 19
4. If LNCH BRK is turned on, the Resume Datalog Screen displays.
rESU
4
RESUME
•
Press and release the POWER ENTER button to continue
accumulating time-weighted average (TWA), PEAK readings, and
time in operation from the last time the GX-2012 was used. The
short-term exposure limit [STEL] reading is reset each time the GX2012 is turned on.
•
Press and release the DISPLAY(ADJ) button to reset the
accumulation of these measurements.
If you do not press the POWER ENTER or DISPLAY(ADJ) button
within 5 seconds, the GX-2012 automatically resumes accumulating the
TWA, PEAK readings, and time in operation.
5. If CL RMNDR is turned on (factory setting), the screen that appears next
depends on how CL EXPRD is set in the Maintenance Mode Menu
(page 131).
•
If the unit is due for calibration and CL EXPRD is set to CONFIRM
(factory setting), then the following screen displays.
CAL
C--LIMIT
The alarm LED’s and buzzer will pulse several times. After this,
press the RESET SILENCE button until you hear a beep to continue.
20 • Start Up, Normal Mode
GX-2012 Operator’s Manual, CSA Version
•
If the unit is due for calibration and CL EXPRD is set to NOT USE,
then the following screen displays.
FAIL
C--LIMIT
The GX-2012 cannot be used until a calibration has been performed
either by selecting AUTO CAL or ONE CAL in the Maintenance
Mode menu. See “Calibrating Using Auto Calibration” on page 105
or “Calibrating Using Single Calibration” on page 108 for calibration
instructions.
•
If calibration is not due or CL EXPRD is set to NO EFFECT, then
the following screen appears for a few seconds indicating when the
next calibration is due.
2011
9
30
69d
NEXT CAL
6. If BP RMNDR is turned on (factory setting is OFF), the screen that
appears next depends on how BP EXPRD is set in the Maintenance
Mode Menu (page 131).
•
If the unit is due for a bump test and BP EXPRD is set to CONFIRM
(factory setting), then the following screen displays.
tESt
B--LIMIT
The alarm LED’s and buzzer will pulse several times. After this,
press the RESET SILENCE button until you hear a beep to continue.
GX-2012 Operator’s Manual, CSA Version
Start Up, Normal Mode • 21
•
If the unit is due for a bump test and BP EXPRD is set to NOT USE,
then the following screen displays.
FAIL
B--LIMIT
The GX-2012 cannot be used until a bump test has been performed
by selecting BUMP in the Maintenance Mode menu. See
“Performing a Bump Test” on page 111 for bump testing instructions.
•
If a bump test is not due or BP EXPRD is set to NO EFFECT, then
the following screen appears for a few seconds indicating when the
next bump test is due.
2011
9
30
10d
NEXTBUMP
NOTE: If both CL RMNDR and BP RMNDR are turned off, a WARM UP
screen will display before the warm up sequence continues.
22 • Start Up, Normal Mode
GX-2012 Operator’s Manual, CSA Version
7. If ID DISP is turned on (see page 135), the User ID Screen displays for a
few seconds and then the Station ID Screen displays for a few seconds.
U Id
-------S Id
-------8. The Date/Time Screen appears for a few seconds.
2011
8
31
22:39
DATE
This screen displays the current year, month, day, and time.
GX-2012 Operator’s Manual, CSA Version
Start Up, Normal Mode • 23
9. The Battery Level and Alarm Pattern Screen appears next.
bAtt
3.7
AL-H V
AL -- H indicates latching (hold) alarms and AL -- A indicates selfresetting (automatic) alarms. The number shown indicates the voltage of
the batteries. A fully charged lithium ion battery pack will display 3.7 V.
If the unit is powered by alkaline (dry cell) batteries, a “D” will appear in
front of the “V” in the lower right corner.
bAtt
3.7
AL-H D: V
10. The display then indicates the following items for about a second each:
•
Full scale values for all channels
•
Warning setpoint (low gas alarm) for all channels
•
Alarm setpoint (high gas alarm) for all channels
•
STEL alarm setpoint for the CO and H2S channels
•
TWA alarm setpoint for the CO and H2S channels
NOTE: If the combustible channel is factory set as %volume only, all gas
alarms are turned off. You must press and release the RESET
SILENCE button at the warning, alarm, STEL, and TWA screens to
acknowledge that there are no gas alarms. The warm up will not
proceed until you do so.
If the combustible channel is set up as %volume only using the HC
Range Screen in Display Mode, it will automatically revert to
Autoranging when it is turned off and on again and the no alarm
acknowledgement screen will not appear.
24 • Start Up, Normal Mode
GX-2012 Operator’s Manual, CSA Version
11. If the GX-2012 experiences a sensor failure during start up, a screen
indicating which sensor failed displays. In the example below, the CO
sensor has failed.
FAIL
CO
ppm
SENSOR
If you wish to continue, press and release the RESET SILENCE button to
acknowledge the failure. The gas reading for the failed sensor will be
replaced by “---”. Replace the failed sensor as soon as possible.
12. The GX-2012 is now operating in Normal Mode and monitoring for gas
in Measuring Mode. The Normal Operation Screen appears.
CH4
O2
CO
H2S
0
20.9
0
0.0
22:37
%LEL
%
ppm
ppm
The concentrations of the target gases are displayed along with the time and
battery charge level. The heart symbol displayed just to the left of the battery
charge level flashes while the instrument is functioning properly. If it
disappears or is steadily on, the unit is experiencing a microprocessor error.
The fan symbol just to the left of the heart symbol spins while the pump is
operating.
Turning On the GX-2012 in Normal Mode
With All Modes Active
If the L./B. MODE item in Maintenance Mode is set to LC, bH, or LC bH
(see “Updating the Leak Check/Bar Hole Mode Setting” on page 137), then
the user must select Normal Mode during the start up sequence to operate in
Normal Mode. The standard factory setting for L./B. MODE is OFF. See
“Chapter 4: Using the GX-2012 in Bar Hole Mode” on page 73 for a
description of Bar Hole Mode or “Chapter 5: Using the GX-2012 in Leak
Check Mode” on page 84 for a description of Leak Check Mode.
The following description of the GX-2012 start up sequence assumes that the
following menu items in Maintenance Mode are turned on: LNCH BRK, ID
GX-2012 Operator’s Manual, CSA Version
Start Up, Normal Mode • 25
DISP, CL RMNDR, and BP RMNDR. If any of these items is turned off,
then the corresponding screen will not appear. It also assumes that the L./B.
MODE menu item in Maintenance Mode is set to LC bH. If L./B. MODE is
set to LC, the Bar Hole Mode Select Screen will not appear. If L./B. MODE
is set to bH, the Leak Check Mode Select Screen will not appear.
1. Connect the tapered rubber nozzle or the sample hose to the
GX-2012’s quick connect inlet fitting.
2. If a sample hose is used, screw the probe onto the sample hose’s threaded
fitting.
3. Press and briefly hold down the POWER ENTER button. The Normal
Mode Select Screen displays.
0
O2
20.9
CO
0
H2 S
0.0
NORMAL ?
CH4
vol%
%LEL
%
ppm
ppm
4. You can use the AIRS button to scroll to the Bar Hole Mode Select
Screen.
BAR HOLE MODE
CH4
O2
0
20.9
vol%
%LEL
%
30
B.H. MODE?
sec
5. Press the AIRS button again to display the Leak Check Mode Select
Screen.
LEAK CK MODE
LEAK CK MODE
CH4
0
CH4
ppm
0
0
5000
L.C. MODE?
CO
5000
L.C. MODE?
ppm
CO DISP OFF
26 • Start Up, Normal Mode
ppm
ppm
ppm
CO DISP On
GX-2012 Operator’s Manual, CSA Version
NOTE: If the CO DISP parameter in Maintenance Mode is set to On, the
CO channel will appear in Leak Check Mode. If the CO DISP
parameter is set to OFF (factory setting), the CO channel will not
appear in Leak Check Mode. See “Chapter 5: Using the GX-2012 in
Leak Check Mode” on page 84 for more information.
You can scroll up or down through these screens using the AIRS or
(SHIFT)T buttons.
6. With the Normal Mode Select Screen displayed, press and release the
POWER ENTER button and continue with the startup sequence as
described in the previous section, “Turning On the GX-2012, Normal
Mode Only”, from step 4 on page 20 on.
NOTE: If no button is pressed for 20 seconds, the unit will proceed into
whichever mode is displayed.
7. To exit Normal Mode and return to the Mode Select Screen, press and
hold the (SHIFT)T button for 5 seconds while in the Normal Operation
Screen.
Performing a Fresh Air Adjustment, Normal Mode
Before using the GX-2012, it is recommended to set the fresh air readings for
the target gases by performing a fresh air adjustment. This will set the
combustible gas, CO, and H2S channels to zero and the OXY channel to
20.9%.
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-2012,
Normal Mode Only” or “Turning On the GX-2012 in Normal Mode With
All Modes Active”.
3. Press and hold the AIRS button. The display prompts you to hold the
AIRS button.
AIr
CAL
HOLD AIR
4. Continue to hold the AIRS button until the display prompts you to
release the AIRS button. The GX-2012 will count down from 8 on an
autoranging combustible gas channel as it sets the fresh air reading for all
GX-2012 Operator’s Manual, CSA Version
Start Up, Normal Mode • 27
channels. Once the countdown has finished, start up is complete and the
unit is ready for monitoring.
Turning Off the GX-2012, Normal Mode
1. Press and hold the POWER ENTER button.
2. The buzzer will pulse for about three seconds and TURN OFF will be
displayed along the bottom of the screen.
3. Release the button when TURN OFF disappears.
Measuring Mode, Normal
Operation
The GX-2012 has three operating modes within Normal Mode: Measuring
Mode, Display Mode, and Calibration Mode. This section describes using the
GX-2012 in Measuring Mode during normal operation.
In Measuring Mode the GX-2012 continuously monitors the sampled
atmosphere and displays the gas concentrations present for its target gases. In
a low-light environment, press and release any button to turn on the display
backlight. See “Updating the LCD Back Light Time Setting” on page 135 to
program backlight duration. If the BEEP. SET menu item in Maintenance
Mode is turned on, the GX-2012 beeps once every 5 minutes to confirm that
it’s operating. See “Updating the Confirmation Beep Setting” on page 129 for
instructions to update the setting.
Monitoring an Area
1. Start up the GX-2012 as described above in “Start Up, Normal Mode” on
page 19 or “Turning On the GX-2012 in Normal Mode With All Modes
Active”. It is now in Measuring Mode.
2. Take the GX-2012 to the monitoring area.
If the tapered rubber nozzle is used, put the nozzle tip in the area to be
monitored.
If the hose and probe is used, put the probe tip in the area to be
monitored.
3. Wait 10 - 15 seconds and observe the display for gas readings. If a
reading is observed, allow the reading to stabilize to determine the gas
concentrations present.
28 • Measuring Mode, Normal Operation
GX-2012 Operator’s Manual, CSA Version
NOTE: Response time increases with the length of the sample hose. Long
sample hoses will require more time to show a response at the GX2012. The maximum sample hose length recommended for the GX2012 is 50 feet. Consult RKI Instruments, Inc. for longer sample
hose lengths.
4. If a gas alarm occurs, take appropriate action. See “Responding to
Alarms” on page 39.
Using Optional Probes and Fittings
This section describes how to use the 8 meter hose with floating head and the
purge tee fitting.
Using the 8 Meter Hose with Floating Head
This probe is designed to be used in a tank or a well that may have water or
some other liquid at the bottom. To use the 8 meter hose with floating probe:
1. Start up the GX-2012 as described in “Start Up, Normal Mode” on
page 19.
2. Connect the 8 meter hose with floating probe to the GX-2012’s quick
connect inlet fitting.
3. Slowly lower the probe into the area you wish to monitor. If the probe
hits water, it will float and continue to monitor the area.
Figure 14: 8 Meter Hose with Floating Head
Using the Purge Tee Fitting
The purge fitting is used to detect gas levels in a pressurized gas stream from
a pipeline or vessel being purged.
1. Start up the GX-2012 as described in “Start Up, Normal Mode” on
GX-2012 Operator’s Manual, CSA Version
Measuring Mode, Normal Operation • 29
page 19.
2. Connect the purge tee fitting to the GX-2012’s quick connect inlet fitting.
3. Insert the sample port into the flowing gas. The vent port will allow any
excess gas to release to the atmosphere to avoid damage to pump or
sensors.
Pressurized
Stream
Excess
Pressurized
Sample
Sample Port
Vent Port
GX-2012 Inlet
Figure 15: Purge Tee Fitting
Using the Dilution Fitting
The external dilution fitting is a 1:1 dilution fitting. It is normally used when
it is necessary to introduce air into a sample that has no oxygen or a very low
level of oxygen, such as a nitrogen purged sample. It can also be used when
one of the target gas levels in the sample area will likely be present in a
concentration above the detection range for that gas. Since the fittings
partially consist of unplated brass, they are not appropriate for detection of
elevated levels of H2S.
1. Start up the GX-2012 as described in “Start Up, Normal Mode” on
page 19.
2. Install the dilution fitting to the GX-2012’s quick connect inlet fitting.
3. Connect the tapered rubber nozzle or the sample hose to the GX-2012’s
quick connect inlet fitting.
4. If a sample hose is used, screw the probe onto the sample hose’s threaded
fitting.
5. Monitor the sampling area.
30 • Measuring Mode, Normal Operation
GX-2012 Operator’s Manual, CSA Version
NOTE: The GX-2012 can be calibrated either with or without the dilution
fitting in place. If calibrated without the dilution fitting in place,
then display readings must be doubled to determine the actual gas
concentration. If calibrated with the dilution fitting in place, then a
sample bag must be used during calibration, and the display
readings will be the actual gas concentrations.
CAUTION: If the dilution fitting is in place for calibration, do not use a
demand flow regulator. Use a sample bag. The use of a demand
flow regulator with a dilution fitting when calibrating will
result in an inaccurate calibration.
Figure 16: Dilution Fitting
Combustible Gas Detection
The GX-2012 can support two combustible gas sensors, a TC (thermal
conductivity) sensor for detection in the % volume range, and a catalytic
sensor for detection in the % LEL range. Either or both sensors may be
installed in your unit.
If both the % volume and % LEL sensors are installed, the combustible gas
channel is setup at the factory as % LEL/% volume autoranging. In this case,
the combustible gas channel will display the combustible gas concentration
in % LEL up to 100% LEL. If the combustible gas concentration rises above
100% LEL, then the unit automatically begins displaying the concentration in
% volume.
CAUTION: If both combustible sensors are installed in your instrument,
make sure you follow the recommendations in the next section,
“Applications with High Levels of Combustible Gas” on
page 32, to protect the % LEL sensor. Failure to do so will result
in damage to the % LEL sensor.
WARNING: If the combustible channel is set for % volume only, then
there are no gas alarms for any detection channel. See “HC
Range Screen” on page 43.
There are three important issues to keep in mind when monitoring for
combustible gas.
GX-2012 Operator’s Manual, CSA Version
Measuring Mode, Normal Operation • 31
Applications with High Levels of Combustible Gas
The GX-2012 provides the % LEL sensor with some protection by turning
off the % LEL sensor power temporarily when it determines that a % LEL
over scale (more than 100% LEL) concentration of combustible gas is
present. When this happens, “OVER” is displayed below the gas list and the
display units to the right of the combustible gas channel change to % volume.
However, this protection is not adequate to completely prevent damage to the
sensor when it is exposed to moderate or high levels of % volume gas.
Combustible gas is present at moderate or high % volume levels in many
applications such as purging applications. If your GX-2012 is equipped with
both the % LEL and %volume sensors, you must set up the instrument so that
the combustible channel operates in the %volume only range when you use
the instrument for this type of application to protect the % LEL sensor from
damage. You can set the combustible channel to operate in the % volume
range only in the HC Range Screen of Display Mode. See “HC Range
Screen” on page 43 for instructions to set the combustible channel to operate
in the % volume range only.
CAUTION: Failure to set the combustible channel to % volume only
operation when using the GX-2012 for applications with
moderate to high % volume levels of combustible gas will result
in damage to the % LEL sensor.
The instrument may be set up for combustible channel autoranging operation
when it is used for confined space applications where % volume combustible
gas concentrations are not likely to be found.
Silicone & Other Potentially Damaging Compounds
Silicone vapors and chlorine and fluorine compounds, such as chlorinated
hydrocarbons, can damage the %LEL sensor. These compounds should be
avoided. If exposure to these compounds is suspected, verify the %LEL
response on a known gas sample.
%LEL Sensor Relative Responses
Although the standard factory setup and calibration for the combustible gas
channel is to methane (CH4), the combustible sensors will respond to other
combustible gases as well.
The table below lists the conversion factors for several hydrocarbon gases for
the % LEL combustible sensor if it is calibrated to methane. Conversion
factors are not available for the % volume TC sensor. 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
32 • Measuring Mode, Normal Operation
GX-2012 Operator’s Manual, CSA Version
you are detecting pentane and the display reads 10% LEL on the combustible
gas channel, you actually have 10% LEL x 1.56 = 15.6% LEL pentane
present.
Table 3: LEL Hydrocarbon Conversions
Gas
LEL Conversion
Factor (Methane
Calibration)
Gas
LEL Conversion
Factor (Methane
Calibration)
Acetone
1.79
Iso Butane
1.47
Acetylene
1.92
MEK
2.27
Benzene
2.00
Methane
1.00
Ethane
1.09
Methanol
1.92
Ethanol
2.50
Pentane
1.56
Ethylene
1.06
Propane
1.35
Heptane
2.50
Propylene
1.32
Hexane
2.08
Toluene
3.13
Hydrogen
1.25
Xylene
4.27
IPA
2.78
Snap Log Mode
The snap logging function in Snap Log Mode allows the user to record data at
a specific time and have it saved to the data logger. The data is assigned a
snap log ID and is saved with the station ID that was in use when the data
was taken.
To enter Snap Log Mode and record snap log data:
1. Press and hold the (SHIFT)T button, then press and hold the AIRS
button and hold both until you hear a beep. The unit will cycle through
the following screens.
GX-2012 Operator’s Manual, CSA Version
Measuring Mode, Normal Operation • 33
no
016
REC. DATA
S Id
001
2011
9
27
22:37
YES/ENT.
34
O2
19.2
CO
10
H2S
7.8
NO /DISP
CH4
%LEL
%
ppm
ppm
The first screen displays what snap log ID will be given to this particular
set of data. This ID number increases sequentially with each set of snap
log data taken. The second screen displays what Station ID will be
associated with this snap log. The third screen displays the year, month,
34 • Measuring Mode, Normal Operation
GX-2012 Operator’s Manual, CSA Version
day, and time of the snap log, and that you should press the POWER
ENTER button to save a set of snap log data. The fourth screen displays
the current gas readings, and that you should press the DISPLAY (ADJ)
button to exit Snap Log Mode without saving a set of snap log data.
2. You can change the Station ID to be used with the snap log by pressing
the (SHIFT)T button and then pressing the DISPLAY (ADJ) button. The
Station ID Select Screen will appear and the current Station ID will be
flashing.
S Id
SEL
001
3. Use the (SHIFT)T and AIRS buttons to scroll to the desired station ID,
then press and release the POWER ENTER button to return to the Snap
Logging Screen sequence.
To return to the Snap Logging Screen sequence without changing the
station ID, press and release RESET SILENCE.
4. To take a snap log of the current gas readings, press and release the
POWER ENTER button. The unit will display SAVED along the bottom
of the screen before returning to the Snap Logging Screen sequence.
SAVED
To exit Snap Log Mode without taking a snap log or when you are
finished recording snap logs, press and release the DISPLAY (ADJ)
button. The unit will immediately return to the Normal Operation Screen.
5. The data recorded in Snap Log Mode can be viewed in Display Mode.
See “Snap Logging Screen” on page 53 for more information.
GX-2012 Operator’s Manual, CSA Version
Measuring Mode, Normal Operation • 35
Measuring Mode, Alarms
This section covers alarm indications in Measuring Mode. It also tells you
how to reset the GX-2012 after an alarm has occurred and how to respond to
an alarm condition.
NOTE: False alarms may be caused by radio frequency (RF) or
electromagnetic (EMI) interference. Keep the GX-2012 away from
RF and EMI sources such as radio transmitters or large motors.
Alarm Indications
CAUTION: If the combustible channel is set for %volume only, then there
are no gas alarms for any detection channel. See “HC Range
Screen” on page 43.
The GX-2012 will sound an alarm, the unit will vibrate, and the LED arrays
will flash when one of the target gas concentrations rises above the Warning
level, or in the case of oxygen, falls below the Low Alarm setting for that gas.
The GX-2012 also sounds an alarm, vibrates, and flashes the LED arrays
when the Alarm level is reached for combustible gas, CO, and H2S, when the
concentration of oxygen rises above the High Alarm level, and when the
STEL and TWA alarm points are reached for CO and H2S.
When a failure condition occurs, such as a sensor failure, low flow, or dead
battery condition, the unit will also sound an alarm, flash the LED arrays, and
vibrate.
The table below summarizes the types of alarms produced by the
GX-2012.
Table 4: Alarm Types and Indications
Alarm Type
Visual Indications
Other Indications
Low Alarm
• WARNING appears
below the gas list.
• Reading for the gas in
alarm flashes
• Alarm LED arrays
flash
• Backlight turns on
• Buzzer sounds
alternating between a
low and high pitch
• Vibrator pulses
Concentration of gas
rises above the Warning
level, or falls below the
Low Alarm level for O2.
36 • Measuring Mode, Alarms
GX-2012 Operator’s Manual, CSA Version
Table 4: Alarm Types and Indications
Alarm Type
Visual Indications
Other Indications
High Alarm
• ALARM appears
below the gas list.
• Reading for the gas in
alarm flashes
• Alarm LEDs flash
faster than warning
indication
• Backlight turns on
• Buzzer sounds
alternating between
low and high pitch
faster than warning
indication
• Vibrator pulses faster
than warning
indication
• TWA or STEL appears
below the gas list.
• Alarm LEDs flash
• Back light turns on
• Buzzer sounds
alternating between a
low and high pitch at
the same rate as
warning indication
• Vibrator pulses at
same rate as warning
indication
• Gas reading replaced
by brackets flashing at
same rate as alarm
indication
• Buzzer sounds
alternating between a
low and high pitch at
same rate as alarm
indication
• Vibrator pulses at
same rate as alarm
indication
Concentration of gas
rises above the Alarm
level, or rises above the
High Alarm level for O2.
TWA or STEL
Concentration of CO or
H2S rises above the
TWA or STEL alarm
point setting.
Over Range*
• Alarm LEDs flash at
same rate as alarm
indication
• Back light turns on.
• OVER appears below
the gas list.
Low Flow*
Low Battery
Warning*
Dead Battery Alarm*
• The display indicates
FAIL LOW FLOW
• The Alarm LED’s flash
• Buzzer sounds a
double pulsing tone
(two pulses in quick
succession)
• Battery icon blinks
• None
• Gas readings
replaced by FAIL
• Fan symbol
disappears
• BATTERY displayed
along bottom of
screen
• Alarm LED arrays
flash
Buzzer sounds a double
pulsing tone (two pulses
in quick succession)
GX-2012 Operator’s Manual, CSA Version
Measuring Mode, Alarms • 37
Table 4: Alarm Types and Indications
Alarm Type
Visual Indications
Other Indications
Sensor Failure*
• FAIL appears at the
bottom of the display
and the failed
sensor(s) are
indicated
• Alarm LED arrays
flash
Buzzer sounds a double
pulsing tone (two pulses
in quick succession)
Clock Failure*
• FAIL CLOCK appears
on the display
• Alarm LED arrays
flash
Buzzer sounds a double
pulsing tone (two pulses
in quick succession)
System Failure*
• FAIL SYSTEM
appears on the
display
• Alarm LED arrays
flash
• Buzzer sounds a
double pulsing tone
(two pulses in quick
succession)
• A failure code appears
Microprocessor
Failure*
• Heart indicator is
steadily on or not on
at all
• None
• NOTE: The unit will
not operate if this
alarm occurs.
*This alarm can also occur in Bar Hole Mode
Resetting and Silencing Alarms
You can set the GX-2012’s gas alarms as latching or self-resetting alarms (see
“Updating the Alarm Latching Setting” on page 117) and the buzzer
operation as silenceable or not silenceable (see “Updating the Alarm Silence
Setting” on page 118).
• Self-resetting alarms (LATCHING set to OFF)
Self-resetting alarms automatically shut off and reset when the gas
reading falls below (or rises above for an oxygen low alarm) the alarm
setting. You cannot silence or reset self-resetting alarms.
• Latching alarms (LATCHING set to ON)
You can set latching alarms with or without Alarm Silence (see “Updating
the Alarm Silence Setting” on page 118).
With ALRM SLNC On and LATCHING On:
When the GX-2012 goes into a gas alarm, press the RESET SILENCE button
to silence the buzzer. If the gas concentration was still above the alarm level
when the button was pressed, the LEDs continue to flash, and the GX-2012
38 • Measuring Mode, Alarms
GX-2012 Operator’s Manual, CSA Version
continues to display the current alarm level.
The gas reading must fall below (or rise above for an oxygen low alarm) the
low alarm setting before you can reset the alarm. Press the RESET SILENCE
button to reset the alarm. The LEDs turn off and the GX-2012 alarm
indications on the display turn off.
With ALRM SLNC OFF and LATCHING ON:
The gas reading must fall below (or rise above for an oxygen low alarm) the
low alarm setting before you can reset the alarm. Press the RESET SILENCE
button to reset the alarm. The LEDs and buzzer turn off and the GX-2012
alarm indications on the display turn off.
NOTE: With ALRM SLNC set to OFF in Maintenance Mode, you cannot
silence the buzzer while the gas reading is above (below for an
oxygen Low Alarm) the low alarm setting.
Responding to Alarms
This section describes response to gas, over range, battery, and sensor failure
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. If necessary, reset the alarm using the RESET SILENCE button once the
alarm condition has been cleared.
Responding to Over Range Alarms
WARNING: An over range alarm may indicate an extreme combustible
gas, toxic gas, or oxygen concentration. Confirm a normal
condition with a different GX-2012 or with another gas
detecting device.
CAUTION: High off-scale readings may indicate an explosive
concentration.
PRUDENCE:Des lectures élevées hors échelle peuvent indiquer une
concentration explosive.
1. Determine which gas alarm has been activated.
2. Follow your established procedure for an increasing gas condition.
3. Reset the alarm using the RESET SILENCE button once the alarm
GX-2012 Operator’s Manual, CSA Version
Measuring Mode, Alarms • 39
condition has cleared.
4. Calibrate the GX-2012 as described in the calibration section of this
manual.
5. If the over range condition continues, 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.
Responding to Battery Alarms
WARNING: The GX-2012 is not operational as a gas monitoring device
during a dead battery alarm. Take the GX-2012 to a nonhazardous area and replace or recharge the batteries as
described in “Replacing or Recharging the Batteries” on
page 146.
The GX-2012 is fully functional during a low battery warning. However,
only a limited amount of operating time remains, approximately 1 - 2 hours.
The amount of time depends on how often the LCD backlight is used and
how often the unit is responding to alarm conditions. Recharge the battery
pack or replace the alkaline batteries as soon as possible as described in
“Replacing or Recharging the Batteries” on page 146.
NOTE: Alarms and the back light feature consume battery power and
reduce the amount of operating time remaining.
Responding to Sensor Failure Alarms
1. Determine which sensor has triggered the sensor failure alarm.
2. Try calibrating the sensor first, as described in “Calibration Mode” on
page 57 before replacing it.
3. If the sensor failure continues, replace the sensor as described in
“Replacing a Sensor” on page 156.
4. If the sensor failure condition continues after you have replaced the
sensor, contact RKI Instruments, Inc. for further instructions.
Responding to Clock Failure Alarm
This alarm occurs if the internal unit date has been changed to something
unreasonable like 15/34 (month/day).
1. Press and release the RESET SILENCE button to continue into normal
operation.
40 • Measuring Mode, Alarms
GX-2012 Operator’s Manual, CSA Version
CAUTION: There will be no datalogging function if you operate the
instrument after a clock failure.
2. Attempt to change the date using the DATE menu time in Maintenance
Mode. See “Updating the Date and Time Settings” on page 103.
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, the system failure screen will display an error
code as shown below:
FAIL
031
SYSTEM
2. The error code meanings are shown below:
Table 5: Error Code Explanation
Error Code
Explanation
000
MPU failure
010
RAM failure
021
EEPROM failure
031
FLASH memory failure
3. If the error code is anything but 031 as shown above, the instrument
cannot be used. Contact RKI Instruments, Inc. as soon as possible.
If the error code is 031, you may press and release the RESET SILENCE
button to continue to normal operation 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 Microprocessor Failure
If your unit experiences a microprocessor failure, the heart symbol at the top
of the screen will be steadily on or steadily off. The unit cannot be used in
GX-2012 Operator’s Manual, CSA Version
Measuring Mode, Alarms • 41
this case. Contact RKI Instruments, Inc. as soon as possible.
Inert Mode
Inert Mode is used to measure the combustible gas and/or oxygen level in a
purged environment. In order for the instrument to operate in Inert Mode, the
oxygen alarm must be set to H-HH operation in which both alarms are
increasing. The oxygen Warning and Alarm points are factory set at 5.0% and
10.0%.
It is recommended that the %volume sensor be installed in a unit that is used
to monitor combustible gas during Inert Mode operation since it does not
require oxygen to work properly. The catalytic LEL sensor does not operate
at oxygen concentrations below 10% volume. If it is necessary to use the
catalytic LEL sensor during Inert Mode operation, a dilution fitting must be
installed. Installing a dilution fitting will affect the oxygen reading since
you’re introducing oxygen into the sample.
Alarms
The oxygen channel alarm points in Inert Mode are different from those in
Normal Mode. All other alarm point settings remain unchanged.
Since the application for Inert Mode is to detect a rising oxygen level in
purged environments, both oxygen alarms are set to rising. The factory set
alarm point is 5.0% volume for the Warning and 10.0% volume for the
Alarm. These alarm points are user adjustable in Maintenance Mode. See
“Updating the Alarm Point Settings” on page 120 for instructions to set the
alarm points.
Start Up and Operation
1. With the oxygen alarm pattern set to H-HH, start up the GX-2012 as
described in “Turning On the GX-2012, Normal Mode Only” on page 19.
2. Once the warm up sequence is complete, the Normal Operation Screen
will display and INERT will appear along the bottom of the display.
CH4
O2
CO
0
20.9
0
%LEL
%
ppm
INERT
3. Since the oxygen concentration in fresh air is above both oxygen alarm
points, the GX-2012 will go into alarm if turned on in a fresh air
42 • Inert Mode
GX-2012 Operator’s Manual, CSA Version
environment.
Display Mode
This section describes using the GX-2012 in Display Mode. With the GX2012 in Display Mode, you can:
• set the combustible gas channel range
• display peak readings
• display STEL and TWA readings (H2S and CO only)
• display full scale, warning, alarm, STEL, and TWA (H2S and CO only)
values
• display time in operation
• display the date and time
• display remaining log time
• clear the data logger
• turn the pump on or off
• select a user ID
• select a station ID
• display snap logging data
• turn peak bar function on or off
To enter Display Mode, press and release the DISPLAY (ADJ) button while
in Measuring Mode. To scroll from one screen to the next press and release
the DISPLAY (ADJ) button.
NOTE: Each screen displays for 20 seconds. If you do not press the
DISPLAY (ADJ) button to scroll to the next screen or press the
POWER ENTER button to enter an item within 20 seconds, the GX2012 automatically returns to Measuring Mode.
HC Range Screen
This screen displays only if your GX-2012 is equipped with both the catalytic
% LEL combustible sensor and the TC % volume combustible sensor. It
allows you to select the display units for the combustible channel as
% LEL/% volume autoranging or % volume. If autoranging is selected, the
combustible gas reading will be displayed in % LEL up to 100% LEL, which
is equivalent to 5% volume for methane (CH4). Above 100% LEL, it will be
displayed in %volume. If % volume is selected, the combustible gas reading
GX-2012 Operator’s Manual, CSA Version
Display Mode • 43
will be displayed in % volume only.
CAUTION: If the combustible channel is set for % volume only, then there
are no gas alarms for any detection channel and NO ALARM
will appear in the upper left corner of the screen when you
return to normal operation.
HC
SEL
22:39
HC RANGE
To update the HC range setting:
1. After entering Display Mode and arriving at the HC Range Screen, press
and release the POWER ENTER button. The current setting will appear
at the bottom of the LCD.
2. Use the AIRS or (SHIFT)T button to change the setting.
3. Press the POWER ENTER button to save the change.
4. Press the DISPLAY (ADJ) button to advance to the next screen.
Peak Screen
The Peak Screen displays the highest (lowest for O2) concentrations detected
since the GX-2012 was turned on. Peak readings are stored in the GX-2012’s
memory until a higher level is detected, the peak reading is reset, or the GX2012 is turned off.
The lunch break feature enables the GX-2012 to remember peak readings
when it is turned off so it can continue them when it is turned on again. See
“Turning On the GX-2012, Normal Mode Only” on page 19. To reset the
peak readings during operation, press and hold the RESET SILENCE button
for a few seconds while in the peak screen.
CH4
O2
CO
H2 S
PEAK
0
20.9
0
0.0
%LEL
%
ppm
ppm
PEAK
44 • Display Mode
GX-2012 Operator’s Manual, CSA Version
STEL Screen
The STEL Screen displays the short-term exposure limit (STEL) readings for
CO and H2S only. The STEL reading is the average reading during the last 15
minutes.
CO
H2 S
0
0.0
ppm
ppm
STEL
TWA Screen
The TWA Screen displays the time-weighted average (TWA) readings for CO
and H2S only.
The TWA reading is the average reading during 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 time is assigned a 0
value for readings.
CO
H2 S
0
0.0
ppm
ppm
TWA
Alarm Points Screen
The Alarm Points Screen allows you to view each channel’s alarm settings
for full scale, warning, alarm, STEL (for CO and H2S only), and TWA (for
CO and H2S only). The bottom line of the screen will alternate between
ALARM--P, NO /DISP, and YES/ENT.
dISP
ALARM--P
GX-2012 Operator’s Manual, CSA Version
Display Mode • 45
Press the POWER ENTER button to proceed to view the full scale settings.
Use the AIRS or (SHIFT)T buttons to scroll through screens showing the
different settings.
CH4
O2
CO
H2 S
100
40.0
500
100.0
vol%
%LEL
%
ppm
ppm
F. S.
10
O2
19.5
CO
25
H2 S
5.0
WARNING
CH4
50
O2
23.5
CO
50
H2 S
30.0
ALARM
CH4
CO
H2 S
200
15.0
%LEL
%
ppm
ppm
%LEL
%
ppm
ppm
ppm
ppm
STEL
46 • Display Mode
GX-2012 Operator’s Manual, CSA Version
CO
H2 S
25
10.0
ppm
ppm
TWA
Pressing and releasing POWER ENTER while in a settings screen will cause
the instrument to simulate that condition. The buzzer, LEDs, and vibration
will activate. Press and release POWER ENTER again to stop the simulated
alarm.
Operation Time Screen
The operation time screen displays the time in minutes since the
GX-2012 was last turned on. The operation time may be continued from the
last time the GX-2012 was in operation by using the lunch break option. See
“Turning On the GX-2012, Normal Mode Only” on page 19.
0:11
OP. TIME
Date/Time Screen
The date/time screen displays the current date and time with the order being
year, month, day, time.
2011
8
31
22:39
DATE
GX-2012 Operator’s Manual, CSA Version
Display Mode • 47
Remaining Log Time Screen
The remaining log time screen displays the time remaining until the data
logger memory is full. The remaining log time depends on how often the GX2012 stores data to the data log, how many channels are active, and how often
the GX-2012 is turned on and off.
LOG
276
H
REMAIN
The table below illustrates how much data logging time is available for the
various interval times. It assumes that the unit is set up with all 5 sensors and
there are no alarm occurrences.
Table 6: Data Logging Capacity, 5 Sensor GX-2012
48 • Display Mode
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
300 hours
10 minutes
600 hours
GX-2012 Operator’s Manual, CSA Version
Clear Data Logger Screens
CAUTION: Once you clear the data logger, you cannot retrieve any data
previously stored in the data logger.
NOTE: This item appears in Display Mode only if the DLOG DSP menu
item in Maintenance Mode is turned ON. The factory setting for
DLOG DSP is ON.
The clear data logger screens allow you to clear the data logger storage. You
can set the GX-2012 to overwrite the oldest data when the data log is full. See
“Updating the Datalog Overwrite Setting” on page 129. The bottom line of
the screen alternates between LG CLEAR, NO /DISP, and YES/ENT.
CLr
LOG
LG CLEAR
To clear the data log:
1. With the above screen displayed, press and release the POWER ENTER
button. The instrument will ask you to confirm that you want to clear the
data log and CLr LOG will be flashing. The bottom line of the screen
alternates between CONFIRM?, YES/ENT., AND NO /DISP.
CLr
LOG
CONFIRM?
2. To cancel the clear data log and return to the Clear Data Logger Screen in
Display Mode, press and release DISPLAY (ADJ).
To continue with the clear data log, press and release POWER ENTER.
GX-2012 Operator’s Manual, CSA Version
Display Mode • 49
3. The GX-2012 displays 4 dashes and as the GX-2012 clears the data, the
dashes disappear. When the last dash is gone, the GX-2012 has been
cleared and the remaining log time value is reset.
---LG CLEAR
Pump OFF Screen
WARNING: The GX-2012 is not a gas monitoring device while the pump
is off.
NOTE: This item appears in Display Mode only if the POFF DSP menu
item in Maintenance Mode is turned ON. The factory setting for
POFF DSP is OFF.
The GX-2012 pump can be turned on and off in this screen. The bottom line
of this screen alternates between PUMP OFF, NO /DISP, and YES/ENT.
This feature can be used to conserve battery life if there is a significant period
of time until the next gas monitoring task, but you do not want to wait for the
warmup sequence to complete if you turn the instrument off and on again.
On
PUMP OFF
In this screen, press POWER ENTER to turn the pump off. The fan in the
upper right corner of the screen will disappear. Once the pump is off, you
cannot exit this screen and return to normal operation or continue in Display
Mode until you turn the pump back on. To turn the pump back on and
continue in Display Mode or return to Normal Operation, press the POWER
ENTER button again.
50 • Display Mode
GX-2012 Operator’s Manual, CSA Version
User ID Screen
This screen always appears in Display Mode, regardless of the ID DISP
setting in the Maintenance Mode menu. Each user ID can contain up to 16
characters but only the first 8 of those characters are visible in the instrument.
Be sure that all user IDs are distinguishable from each other by viewing only
the first 8 characters. For more information, see the GX-2012 Data Logger
Management Program manual. The bottom line of the screen alternates
between YES/ENT., the current user ID, and NO /DISP. Uppercase letters,
numbers, asterisks (*), dashes (-), and a blank space are available characters.
The GX-2012 can store 128 user IDs.
Use this screen to identify or change the user. The user ID provides a way to
identify the user during a data logging session. The user ID is saved to the
data logger for that session when you turn off the
GX-2012 or change users during operation. This allows you to change the
user ID during operation and have each user ID that was used during an
operating session saved for the corresponding data.
U Id
SEL
YES/ENT.
NOTE: As shipped from the factory, the user ID on this screen is shown as - -- -- -- -- -- until you enter this screen and select a user ID.
To change a user:
1. After entering Display Mode and proceeding to the User ID screen, press
and release the POWER ENTER button. The bottom line of this screen
alternates between YES/ENT., the current user ID, and NO /DISP.
U Id
SEL
USER--001
GX-2012 Operator’s Manual, CSA Version
Display Mode • 51
2. Use the AIRS and (SHIFT)T buttons to scroll through the 128 possible
user IDs.
3. Press the POWER ENTER button to select a user ID.
Station ID Screen
This screen always appears in Display Mode, regardless of the ID DISP
setting in the Maintenance Mode menu. Each station ID can contain up to 16
characters but only the first 8 of those characters are visible in the instrument.
Be sure that all station IDs are distinguishable from each other by viewing
only the first 8 characters. For more information, see the GX-2012 Data
Logger Management Program manual. The bottom line of the screen
alternates between YES/ENT., the current station ID, and NO /DISP.
Uppercase letters, numbers, asterisks (*), dashes (-), and a blank space are
available characters. The GX-2012 can store 128 station IDs.
Use this screen to identify or change the station. The station ID provides a
way to identify the station during a data logging session. The station ID is
saved to the data logger for that session when you turn off the GX-2012 or
change stations during operation. This allows you to change the station ID
during operation and have each station ID that was used during an operating
session saved for the corresponding data.
S Id
SEL
YES/ENT.
NOTE: As shipped from the factory, the station ID on this screen is shown
as -- -- -- -- -- -- until you enter this screen and select a station ID.
52 • Display Mode
GX-2012 Operator’s Manual, CSA Version
To change a station:
1. After entering Display Mode and proceeding to the Station ID screen,
press and hold the POWER ENTER button. The bottom line of this
screen alternates between YES/ENT., the current station ID, and NO /
DISP.
S Id
SEL
001
2. Use the AIRS and (SHIFT)T buttons to scroll through the 128 possible
station IDs.
3. Press the POWER ENTER button to select a station ID.
Snap Logging Screen
The Snap Logging Screen allows you to view data from previous snap
loggings. For information on how to use the snap logging feature, see “Snap
Log Mode” on page 33.
1. To view snap logging data, use the AIRS and (SHIFT)T buttons to
scroll to the Snap Logging Screen. The bottom line of this screen
alternates between REC. DATA, NO /DISP, and YES/ENT.
d ISP
REC. DATA
2. Press and release the POWER ENTER button. If no snap logs have been
performed, the following screen will appear.
NO DATA
GX-2012 Operator’s Manual, CSA Version
Display Mode • 53
3. If snap logs have been performed, the following screen will appear.
2011
8
31
22:39
M023
This screen indicates the year, month, day, and time that the most recent
snap log was taken. The number along the bottom of the screen indicates
the snap log ID number. The first snap log that is taken is given an ID of
M001. The next snap log ID is M002. The ID number increases
sequentially with each set of snap log data. Use the AIRS and
(SHIFT)T buttons to scroll through different snap log IDs and view what
time they were taken.
4. To view the data in a snap log ID, press and release the POWER ENTER
button.
CH4
O2
CO
H2 S
50
23.5
50
30.0
%LEL
%
ppm
ppm
001
The gas readings that were taken during the snap log are displayed and
the Station ID that was in use during the snap log is displayed along the
bottom of the screen. You can use the AIRS and (SHIFT)T buttons to
scroll through the different snap logs. The gas readings and station ID
will change but the snap log ID is not visible from this screen. To scroll
through the data by viewing the snap log ID number, press and
release POWER ENTER.
54 • Display Mode
GX-2012 Operator’s Manual, CSA Version
Peak Bar Select Screen
The Peak Bar Select Screen allows you to turn the peak bar on or off. If the
function is turned on, the peak bar appears along the left side of the screen
during Normal Operation and on the Peak Screen in Display Mode. It shows
the peak readings for each channel in bar graph format. The bottom line of
this screen alternates between the current setting, NO /DISP, and YES/ENT.
bAr
SEL
BAR OFF
To adjust the peak bar selection:
1. Use the DISPLAY (ADJ) button to scroll to the Peak Bar Select Screen.
The screen indicates the current setting.
bAr
SEL
BAR ON
2. Press and release the POWER ENTER button.
On
PEAK BAR
3. Use the AIRS and (SHIFT)T buttons to make your selection and press
and release the POWER ENTER button.
GX-2012 Operator’s Manual, CSA Version
Display Mode • 55
Data Logging
NOTE: The GX-2012 logs data in both Normal Mode and Bar Hole Mode.
The GX-2012 features the ability to log data to its internal memory and
download it to a computer via the infrared communications port located just
below the RESET SILENCE button. It logs gas readings during normal
operation, alarm data, and calibration data.
NOTE: The data logging function is separate from the snap logging
function. For a description of the snap logging function, see “Snap
Log Mode” on page 33.
To utilize the GX-2012’s downloading capability, you will need the GX-2012
downloading software and a computer with an infrared port or a USB port
that runs one of the following operating systems: Windows XP, Windows
Vista, or Windows 7. If your computer has an infrared port, then no
additional accessories are needed to download data from the GX-2012. 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-2012
using a USB port. The downloading software is available from RKI
Instruments, Inc. The adapter cable is also available from RKI or may be
purchased at a computer or electronics supply store.
For a complete description of the downloading software and procedures for
downloading data to a computer, see the GX-2012 Data Logger Management
Program Operator’s Manual.
SDM-2012
The GX-2012 can be used with the SDM-2012 if desired. The
SDM-2012 can charge the instrument if the lithium ion battery pack is being
used. It can also bump test, calibrate, and retrieve saved data. The SDM-2012
can be operated as a single, stand-alone unit or can be used with up to 9 other
SDM-2012s and operated using a computer. For more information about the
operation of the SDM-2012, see the SDM-2012 operator’s manual.
56 • Data Logging
GX-2012 Operator’s Manual, CSA Version
Calibration Mode
Calibration Mode allows you to calibrate the GX-2012’s sensor response and
to bump test the GX-2012.
CAUTION: BEFORE EACH DAY’S USAGE, SENSITIVITY IN THE
% LEL RANGE MUST BE TESTED ON A KNOWN
CONCENTRATION OF THE COMBUSTIBLE TARGET GAS,
METHANE, EQUIVALENT TO 25 - 50% OF FULL SCALE
CONCENTRATION (The % LEL full scale is
100% LEL). ACCURACY MUST BE WITHIN -0 to + 20% OF
ACTUAL. ACCURACY MAY BE CORRECTED BY
FOLLOWING THE CALIBRATION INSTRUCTIONS FOR THE
COMBUSTIBLE CHANNEL BELOW.
If the combustible channel passes the above response test and does not
require calibration, the unit should still be calibrated periodically. The
optimum frequency of calibration depends heavily on how the GX-2012 is
used. For example, instruments used daily may need to be calibrated weekly
or monthly, while instruments that are used only a few times a year may need
to be calibrated before each use. Typical calibration frequencies range from
monthly to quarterly. Make sure to perform the combustible channel response
test as described above and make sure to develop a calibration schedule
tailored to your application that takes this test and required calibration
resulting from this test into account.
You can program the GX-2012 to notify you when it is due for calibration.
See “Updating the Calibration Reminder Setting” on page 130.
Calibration/Bump Test Supplies and Equipment
To calibrate or bump test the GX-2012, you will need:
• Known calibrating samples of the gases being detected. The combustible
and toxic gas samples should have concentrations in approximately the
middle of the range of detection. An oxygen-free source, such as 100%
nitrogen is recommended for setting the oxygen zero when using single
calibration.
• A demand-flow regulator to provide adequate sample gas flow
• Non-absorbent tubing
GX-2012 Operator’s Manual, CSA Version
Calibration Mode • 57
CAUTION: If you are using a calibration kit that includes a gas bag and a
fixed flow regulator or dispensing valve, do not apply gas
directly to the GX-2012 with the regulator or valve or damage to
the pump will result. See “Appendix A: Calibrating and Bump
Testing with a Sample Bag” on page 162 for instructions to
properly use a gas bag kit.
To calibrate or bump test the %LEL, Oxygen, CO, and H2S sensors at the
same time, automatically, with no need for a zero-oxygen source, you can use
the auto calibration feature with a 4-gas cylinder. If the H2S channel is not
active, then a 3-gas cylinder may be used for auto-calibration. This section
includes instructions for auto calibration and bump testing with a demandflow regulator, a 4-gas cylinder, and a %volume methane cylinder. This
section also includes instructions for calibrating one channel at a time using
single calibration.
NOTE: If the combustible gas channel(s) are calibrated to a gas other
than methane, use an appropriate multigas cylinder or use
single calibration to calibrate the combustible channel(s).
Preparing for Calibration or Bump Testing
Whether you will calibrate the GX-2012 using auto calibration, single
calibration, or perform a bump test, you will need to set the fresh air readings
first.
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 in “Turning On the GX-2012, Normal Mode
Only” on page 19 or in “Turning On the GX-2012 in Normal Mode With
All Modes Active” on page 25. Use the sample hose and probe.
3. With the unit on, perform a fresh air adjustment by pressing and holding
the AIRS button. The display prompts you to hold the AIRS button.
4. Continue to hold the AIRS button until the display prompts you to
release it. The GX-2012 will set the fresh air reading for all channels as it
counts down from 8. If the combustible channel is set as %LEL only or
vol% only, there is no countdown period. The fresh air reading is set
immediately.
5. Install the demand flow regulator onto the calibration cylinder.
6. Connect the sample tubing to the demand flow regulator.
58 • Calibration Mode
GX-2012 Operator’s Manual, CSA Version
Calibrating the GX-2012
From Measuring Mode, enter Calibration Mode by pressing and holding the
(SHIFT)T button, then pressing the DISPLAY(ADJ) button and releasing
both. If the unit prompts you for the password, enter it by using the AIRS
and (SHIFT)T buttons to select each password number and then pressing
and releasing POWER ENTER to confirm it and move on to the next number.
To go back a number, press and release the RESET SILENCE button. The
factory set password is the same as the factory set password for Maintenance
Mode: 2102. You can change the password by entering the PASSWORD
menu item in Maintenance Mode. See “Turning the Password Function On or
Off” on page 141. If you enter an incorrect password, an error screen will
display.
Err
PASSWORD
To return to normal operation, press and release the RESET SILENCE
button. You may then try to reenter Calibration Mode.
MAINTENANCE will appear along the top of the screen once you have
entered Calibration Mode. The first item in the calibration menu, AIR CAL,
displays.
NOTE: The following screens illustrate a four-gas GX-2012 with both a
%LEL and a %volume combustible gas sensor as examples only.
Your GX-2012 may display slightly different screens.
MAINTENANCE
AIR CAL
The GX-2012’s calibration menu includes two methods of calibration:
auto calibration and single calibration.
• Auto Calibration: This method allows you to calibrate the combustible
gas (%LEL sensor only), OXY, H2S, and CO sensors simultaneously. It is
GX-2012 Operator’s Manual, CSA Version
Calibration Mode • 59
designed for use with the RKI 4-gas calibration cylinder and is the
quickest and easiest method to calibrate the
GX-2012. If installed, you may also calibrate the %volume sensor
separately from the standard four.
• Single Calibration: This method allows you to calibrate one sensor at a
time. Use this method if you are only calibrating one or two sensors, if
you are calibrating only the %volume combustible sensor, or if you are
not using the RKI 4-gas calibration cylinder.
Calibrating with the Auto Calibration Method
This section describes calibration using the auto calibration method.
To calibrate using the single calibration method, see “Calibrating with the
Single Calibration Method” on page 63. These instructions assume you are
using a 4-gas cylinder and a %volume methane cylinder.
NOTE: If the combustible gas channel(s) are calibrated to a gas other
than methane, use an appropriate multigas cylinder or use
single calibration to calibrate the combustible channel(s).
1. You may only calibrate either the standard 4 sensors or the % volume
combustible sensor at a time. Once you are finished, you are returned to
the initial AUTO CAL screen and must begin the auto calibration process
again.
2. Use the AIRS and (SHIFT)T buttons to display the AUTO CAL menu
item, press and release the POWER ENTER button to display the
calibration values screen. If you want to exit back to the main menu
without completing a calibration, press and release the DISPLAY (ADJ)
button.
60 • Calibration Mode
GX-2012 Operator’s Manual, CSA Version
3. Use the AIRS or (SHIFT)T button to alternate between the 4-gas and
the % volume combustible gas calibration values screens.
MAINTENANCE
50
O2
12.0
CO
50
H2 S
25.0
AUTO CAL
CH4
%LEL
%
ppm
ppm
MAINTENANCE
CH4
100
vol%
AUTO CAL
4. The gas concentrations displayed in the calibration values screens must
match the gas concentrations listed on the calibration cylinders. If all
concentrations match, go to step 12. If one or more concentrations do not
match, continue with step 5.
5. To adjust the values on the screens, hold down the (SHIFT)T button,
then press the DISPLAY(ADJ) button and release both. The %LEL
sensor is shown here.
MAINTENANCE
CH4
---
%LEL
AUTO CAL
6. Use the AIRS and (SHIFT)T buttons to scroll through the sensors and
select the sensor whose calibration gas value you want to adjust.
7. Press and release the POWER ENTER button. The sensor’s calibration
gas value will flash.
8. If necessary, use the AIRS and (SHIFT)T buttons to set the correct
calibration gas value.
9. Press and release POWER ENTER button to save the change.
10. Repeat steps 6 through 9 to set the correct values for any additional
GX-2012 Operator’s Manual, CSA Version
Calibration Mode • 61
sensors.
11. After the last calibration gas value is set, use the AIRS button to scroll to
ESCAPE and press POWER ENTER to return to the calibration gas
values screens.
NOTE: The RKI Four Gas Cylinder typically contains 12% O2 by volume.
Be sure to set the “OXY” reading to agree with the concentration
listed on the cylinder’s label, not zero.
12. Use the AIRS or (SHIFT)T button to select which sensor(s) you want to
calibrate, the standard 4 sensors or the %volume combustible gas sensor.
The following instructions illustrate calibrating the standard 4 sensors
first, then the %volume combustible gas sensor.
13. With the 4-gas calibration values screen displayed, press the
POWER ENTER button. AUTO CAL begins to flash and the current gas
readings are displayed. If you want to exit back to the main menu without
completing a calibration, press and release the DISPLAY (ADJ) button.
MAINTENANCE
0
O2
20.9
CO
0
H2 S
0.0
AUTO CAL
CH4
%LEL
%
ppm
ppm
14. Connect the tubing from the demand flow regulator to the rigid tube on
the probe. Allow the gas to flow for one minute.
15. Press and release the POWER ENTER button to set the calibration to the
programmed values.
If all channels passed calibration, PASS displays along the bottom of the
screen, then the calibration menu displays.
62 • Calibration Mode
GX-2012 Operator’s Manual, CSA Version
If any of the sensors cannot calibrate to the proper value, FAIL displays
along the bottom of the screen and the GX-2012 lists the sensor(s) that
failed to calibrate. In the example below, the OXY and H2S channels
failed calibration. The other sensors calibrated normally.
MAINTENANCE
O2
%
H2 S
ppm
FAIL
The buzzer and alarm lights activate. Press and release the RESET
SILENCE button after the buzzer and lights stop to reset the alarm and
return to the calibration menu. Attempt to calibrate again. If the failure
continues, investigate the cause. See “Troubleshooting” on page 143.
16. Disconnect the tubing from the probe.
17. Unscrew the demand flow regulator from the calibration cylinder.
18. If you have a 5 sensor unit and wish to calibrate the %volume
combustible gas sensor, go back to step 1 and repeat the process selecting
the %volume calibration gas value screen in step 12 and using a
%volume methane cylinder.
If you are finished calibrating, use the (SHIFT)T button to navigate to
the NORMAL menu item, then press and release the POWER ENTER
button to return to Measuring Mode.
Calibrating with the Single Calibration Method
This section describes calibration using the Single Calibration method.
To calibrate using the Auto Calibration method, see “Calibrating with the
Auto Calibration Method” on page 60.
The procedure below describes a span adjustment of one channel
using a calibration kit that includes a 4-gas calibration cylinder, a 0.5
LPM (liters per minute) regulator, and non-absorbent sample tubing.
The standard 4-gas cylinder consists of 50% LEL methane, 12%
oxygen, 50 ppm CO, 25 ppm H2S, and a balance of nitrogen. In the
example below, the CH4 channel’s span is adjusted. See “Parts List”
on page 159 for available calibration kits and calibration kit spare
parts.
Calibration cylinders that contain only one target gas may also be
used for single calibration. For channels other than oxygen, RKI
GX-2012 Operator’s Manual, CSA Version
Calibration Mode • 63
Instruments, Inc. recommends that you use a cylinder that contains a
concentration of 10-50% of the full scale value of the target gas. For
example, if you are calibrating the combustible gas channel, your
calibration cylinder should have a combustible gas concentration
between 10% LEL and 50% LEL. For the oxygen channel, RKI
Instruments, Inc. recommends using 100% nitrogen to perform the
adjustment but any concentration between 0% oxygen (100%
nitrogen) and 17% oxygen can be used to make the adjustment.
NOTE: If your combustible gas channel is calibrated to a gas other
than methane, use an appropriate gas cylinder to perform the
calibration.
CAUTION: The single calibration method does not have a “FAIL”
notification. If a sensor cannot be set to agree with the
calibration source, see “Troubleshooting” on page 143.
1. While in the calibration menu, use the AIRS or (SHIFT)T button to
navigate to the ONE CAL menu option.
MAINTENANCE
ONE CAL
2. Press and release the POWER ENTER button to display the single
calibration menu. The %LEL sensor will be displayed first.
MAINTENANCE
CH4
---
%LEL
ONE CAL
64 • Calibration Mode
GX-2012 Operator’s Manual, CSA Version
3. Use the AIRS or (SHIFT)T button to display the sensor you want to
calibrate (in this example the combustible gas % LEL sensor). If you
have a 5 sensor unit, the %vol sensor will be one of the choices. It is
shown below.
MAINTENANCE
CH4
---
vol%
ONE CAL
4. Press and release the POWER ENTER button. The single calibration
screen displays for the sensor you selected. The gas reading flashes.
MAINTENANCE
0
CH4
%LEL
ONE CAL
5. Connect the tubing from the demand flow regulator to the rigid tube on
the probe. Allow the calibration gas to flow for one minute.
6. If necessary, use the AIRS and (SHIFT)T buttons to adjust the reading
to match the concentration listed on the calibration cylinder.
If the reading already matches the concentration listed on the calibration
cylinder, press and release the AIRS button then press and release the
(SHIFT)T button so that the instrument sees a change and resets the
calibration date.
7. Press and release the POWER ENTER button to save the span value. The
LCD will indicate that the calibration has ended, then the single
calibration menu displays.
MAINTENANCE
CH4
---
%LEL
ONE CAL
GX-2012 Operator’s Manual, CSA Version
Calibration Mode • 65
8. Disconnect the tubing from the probe.
9. Repeat steps 3 through 8 for any other sensors you want to calibrate.
Make sure you use an appropriate calibration cylinder for each sensor.
CAUTION: When calibrating the oxygen channel, verify the concentration
of oxygen listed on the cylinder’s label. For oxygen-free samples
(100% nitrogen for example), set the oxygen zero setting to
0.0%.
10. After the last channel is calibrated, disconnect the calibration tubing from
the probe, then unscrew the demand flow regulator from the calibration
cylinder.
11. Use the AIRS and (SHIFT)T buttons to scroll to ESCAPE in the ONE
CAL menu.
12. Press and release the POWER ENTER button to exit ONE CAL.
13. With the ONE CAL menu option displayed, press the (SHIFT)T button
until the NORMAL menu option is displayed.
14. Press and release the POWER ENTER button to return to Measuring
Mode.
Bump Testing the GX-2012
NOTE: The BUMP DSP menu item in Maintenance Mode is factory set to
OFF. The BUMP menu item will not appear unless BUMP DSP is
set to ON. See “Turning the Bump Test Function On or Off” on
page 125 for instructions.
NOTE: The GX-2012 uses parameters defined in the BUMP--SET menu
item of Maintenance Mode while performing a bump test. To view
or update these parameters, see “Updating the Bump Test
Parameters” on page 127.
NOTE: If the combustible gas channel(s) are calibrated to a gas other
than methane, use an appropriate multigas cylinder.
66 • Calibration Mode
GX-2012 Operator’s Manual, CSA Version
From Measuring Mode, enter Calibration Mode by pressing and holding the
(SHIFT)T button, then pressing the DISPLAY(ADJ) button and releasing
both. If the unit prompts you for the password, enter it by using the AIRS
and (SHIFT)T buttons to select each password number and then pressing
and releasing POWER ENTER to confirm it and move on to the next number.
To go back a number, press and release the RESET SILENCE button. The
factory set password is the same as the factory set password for Maintenance
Mode: 2102. You can change the password by entering the PASSWORD
menu item in Maintenance Mode. See “Turning the Password Function On or
Off” on page 141. If you enter an incorrect password, an error screen will
display.
Err
PASSWORD
To return to normal operation, press and release the RESET SILENCE
button. You may then try to reenter Calibration Mode.
MAINTENANCE will appear along the top of the screen once you have
entered Calibration Mode. The first item in the calibration menu, AIR CAL,
displays.
1. Install the demand flow regulator onto the calibration cylinder.
2. Connect the sample tubing to the demand flow regulator.
3. Install the hose and probe to the GX-2012.
4. Use the AIRS or (SHIFT)T buttons to display the BUMP menu item.
MAINTENANCE
BUMP
GX-2012 Operator’s Manual, CSA Version
Calibration Mode • 67
5. Press and release the POWER ENTER button to display the bump test
gas values.
MAINTENANCE
50
O2
12.0
CO
50
H2 S
25.0
BUMP 30
CH4
%LEL
%
ppm
ppm
6. Use the AIRS or (SHIFT)T buttons to see the %volume combustible
gas bump test value.
MAINTENANCE
CH4
BUMP
100
vol%
30
7. A bump test may be performed on the standard 4 sensors or on the
%volume combustible sensor. Use the AIRS or (SHIFT)T buttons to
display the screen for the sensor(s) you wish to bump test.
8. Before proceeding, confirm that the bump test gas value(s) are the same
as the concentration(s) in the calibration cylinder. If they are not, adjust
the bump test gas value(s) by entering the AUTO CAL menu item,
changing the values there, and reentering the BUMP menu.
9. Connect the tubing from the demand flow regulator to the rigid tube on
the probe then quickly press and release the POWER ENTER button. The
unit will begin counting down from 30.
68 • Calibration Mode
GX-2012 Operator’s Manual, CSA Version
10. When AUTO CAL in the BUMP--SET menu item in Maintenance Mode
is set to OFF:
•
The instrument will indicate which channels passed or failed the
bump test with a P (pass) or an F (fail) to the right of the gas.
MAINTENANCE
CH4
O2
CO
H2 S
F
P
F
P
%LEL
%
ppm
ppm
BUMP
•
To view the bump test gas readings press the AIRS or (SHIFT)T
button. You can scroll between the bump test results and the bump
test gas readings with the AIRS or (SHIFT)T button.
MAINTENANCE
CH4
O2
CO
H2 S
5
12.0
10
25.0
%LEL
%
ppm
ppm
BUMP
•
To return to the BUMP screen in Calibration Mode, press POWER
ENTER.
MAINTENANCE
BUMP
If one or more sensors fail the bump test, see “Troubleshooting” on
page 143 to investigate the cause of the failure and replace the failed
sensor or sensors if necessary.
•
Disconnect the tubing from the probe.
GX-2012 Operator’s Manual, CSA Version
Calibration Mode • 69
11. When AUTO CAL in the BUMP--SET menu item in Maintenance Mode
is set to ON:
If all channels pass the bump test,
•
The following screen appears:
MAINTENANCE
CH4
O2
CO
H2 S
P
P
P
P
%LEL
%
ppm
ppm
BUMP
•
To view the bump test gas readings press the AIRS or (SHIFT)T
button. You can scroll between the bump test results and the bump
test gas readings with the AIRS or (SHIFT)T buttons.
MAINTENANCE
CH4
O2
CO
H2 S
45
12.0
47
23.0
%LEL
%
ppm
ppm
BUMP
•
To return to the BUMP screen in Calibration Mode, press POWER
ENTER.
MAINTENANCE
BUMP
•
Disconnect the tubing from the probe.
If any channel fails the bump test,
•
The instrument will beep and a calibration is immediately and
automatically started. Continue to apply the calibration gas. CAL on
the bottom left of the screen will alternate with APPLY.
The calibration time will begin to countdown in seconds in the lower
right of the screen. The calibration time counted down during a
70 • Calibration Mode
GX-2012 Operator’s Manual, CSA Version
calibration initiated because of a failed bump test is the difference
between the bump test gas time and the calibration time defined in the
BUMP--SET menu item in Maintenance Mode.
MAINTENANCE
CH4
O2
CO
H2 S
CAL
•
1
20.9
37
10.0
60
%LEL
%
ppm
ppm
At the end of the calibration, the instrument displays the results from
both the bump test and the calibration. Use the AIRS or (SHIFT)T
button to scroll between the calibration/bump test results, the bump
test gas readings, and the calibration gas readings.
MAINTENANCE
FP
O2
PP
CO
FF
H2 S
PP
BUMP/CAL
CH4
%LEL
%
ppm
ppm
MAINTENANCE
1
O2
12.0
CO
5
H2 S
23.0
BUMP/
CH4
%LEL
%
ppm
ppm
MAINTENANCE
CH4
O2
CO
H2 S
GX-2012 Operator’s Manual, CSA Version
49
12.0
5
25.0
/CAL
%LEL
%
ppm
ppm
Calibration Mode • 71
•
To return to the BUMP screen in Calibration Mode, press POWER
ENTER at any time. If any channel failed the calibration, the buzzer
will sound a double pulsing tone until you press and release the
POWER ENTER button.
MAINTENANCE
BUMP
•
Disconnect the tubing from the probe.
12. Unscrew the demand flow regulator from the calibration cylinder.
13. With the BUMP menu option displayed, press the (SHIFT)T button until
the NORMAL menu option is displayed.
14. Press and release the POWER ENTER button to return to Measuring
Mode.
72 • Calibration Mode
GX-2012 Operator’s Manual, CSA Version
Chapter 4: Using the GX-2012 in Bar Hole Mode
Overview
This chapter explains how to operate the GX-2012 in Bar Hole Mode. Bar
Hole Mode is used to perform consistent checks of bar holes when tracking
down underground gas leaks. When the GX-2012 is in Bar Hole Mode, only
the combustible and oxygen channels are displayed.
If a GX-2012 is intended for bar hole testing, it is shipped with Bar Hole
Mode enabled so that the operator must choose which operational mode to
use when the unit is turned on.
NOTE: Units intended for bar hole testing are typically calibrated to
methane. In addition, the unit must have a %volume combustible
sensor installed.
Start Up, Bar Hole Mode
This section explains how to start up the GX-2012 in Bar Hole Mode and get
it ready for operation.
Turning On the GX-2012, Bar Hole Mode
WARNING: If a CO or H2S sensor is installed, these sensors will not be
active while the GX-2012 is in Bar Hole Mode.
WARNING: Gas alarms are not active when the GX-2012 is in Bar Hole
Mode.
The following description of the GX-2012 start up sequence assumes that the
following menu items in Maintenance Mode are turned on: LNCH BRK, ID
DISP, CL RMNDR, and BP RMNDR. If either of these items is turned off,
then the corresponding screen will not appear.
NOTE: In order for BAR HOLE MODE to appear as a selection in the
Mode Select Screen in Step 3 below, the L./B. MODE menu item in
Maintenance Mode must be set to bH or LC bH.
1. Connect the sample hose to the GX-2012’s quick connect inlet fitting.
2. Screw the bar hole probe onto the sample hose’s threaded fitting.
GX-2012 Operator’s Manual, CSA Version
Overview • 73
3. Press and briefly hold down the POWER ENTER button. The Normal
Mode Select Screen displays.
0
O2
20.9
CO
0
H2 S
0.0
NORMAL ?
CH4
vol%
%LEL
%
ppm
ppm
4. Use the AIRS or (SHIFT)T buttons to scroll to the Bar Hole Mode
Select Screen.
BAR HOLE MODE
CH4
O2
0
20.9
vol%
%LEL
ppm
vol%
%
30
B.H. MODE?
sec
5. With the Bar Hole Mode Select Screen displayed, press and release the
POWER ENTER button to begin the Bar Hole Mode startup sequence.
NOTE: If no button is pressed for 20 seconds, the unit will proceed into
whichever mode is displayed.
6. If CL RMNDR is turned on (factory setting), the screen that appears next
depends on how CL EXPRD is set in the Maintenance Mode Menu
(page 130).
•
If the unit is due for calibration and CL EXPRD is set to CONFIRM
(factory setting), then the following screen displays.
CAL
C--LIMIT
The alarm LED’s and buzzer will pulse several times. After this,
press and release the RESET SILENCE button to continue.
74 • Start Up, Bar Hole Mode
GX-2012 Operator’s Manual, CSA Version
•
If the unit is due for calibration and CL EXPRD is set to NOT USE,
then the following screen displays.
FAIL
C--LIMIT
The GX-2012 cannot be used until a calibration has been performed
either by selecting AUTO CAL or ONE CAL in the Maintenance
Mode menu. See “Calibrating Using Auto Calibration” on page 105
or “Calibrating Using Single Calibration” on page 108 for calibration
instructions.
•
If calibration is not due or CL EXPRD is set to NO EFFECT, then
the following screen appears for a few seconds indicating when the
next calibration is due.
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NEXT CAL
7. If BP RMNDR is turned on (factory setting is OFF), the screen that
appears next depends on how BP EXPRD is set in the Maintenance
Mode Menu (page 131).
•
If the unit is due for a bump test and BP EXPRD is set to CONFIRM
(factory setting), then the following screen displays.
tESt
B--LIMIT
The alarm LED’s and buzzer will pulse several times. After this,
press the RESET SILENCE button until you hear a beep to continue.
GX-2012 Operator’s Manual, CSA Version
Start Up, Bar Hole Mode • 75
•
If the unit is due for a bump test and BP EXPRD is set to NOT USE,
then the following screen displays.
FAIL
B--LIMIT
The GX-2012 cannot be used until a bump test has been performed
by selecting BUMP in the Maintenance Mode menu. See
“Performing a Bump Test” on page 111 for bump testing instructions.
•
If a bump test is not due or BP EXPRD is set to NO EFFECT, then
the following screen appears for a few seconds indicating when the
next bump test is due.
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NEXTBUMP
NOTE: If both CL RMNDR and BP RMNDR are turned off, a WARM UP
screen will display before the warm up sequence continues.
76 • Start Up, Bar Hole Mode
GX-2012 Operator’s Manual, CSA Version
8. If ID DISP is turned on (see page 135), the User ID Screen displays for a
few seconds and then the Station ID Screen displays for a few seconds.
U Id
-------S Id
-------9. The Date/Time Screen appears for a few seconds.
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DATE
This screen displays the current year, month, date, and time.
10. The Battery Level and Alarm Pattern Screen appears next.
bAtt
3.7
AL-H V
GX-2012 Operator’s Manual, CSA Version
Start Up, Bar Hole Mode • 77
AL -- H indicates latching (hold) alarms and AL -- A indicates selfresetting (automatic) alarms. The number shown indicates the voltage of
the batteries. A fully charged lithium ion battery pack will display 3.7 V.
If the unit is powered by alkaline (dry cell) batteries, a “D” will appear in
front of the “V” in the lower right corner.
bAtt
3.7
AL-H D: V
11. The display then indicates the following items for about a second each:
•
Full scale values for all channels
•
Warning setpoint (low gas alarm) for all channels
•
Alarm setpoint (high gas alarm) for all channels
•
STEL alarm setpoint for the CO and H2S channels
•
TWA alarm setpoint for the CO and H2S channels
12. If the GX-2012 experiences a sensor failure during start up, a screen
indicating which sensor failed displays. In the example below, the
combustible gas %volume sensor has failed.
CH4
FAIL
vol%
SENSOR
If one of the combustible sensors, LEL or % volume, fails, it is not
possible to enter Bar Hole Mode. Press and release the RESET SILENCE
button to acknowledge the failure and return to the Mode Select Screen.
Replace the failed sensor as soon as possible.
If the oxygen sensor fails, press and release the RESET SILENCE button
to acknowledge the failure and continue to Bar Hole Mode. The gas
reading for the oxygen sensor will be replaced by “XXX”. Replace the
failed sensor as soon as possible.
78 • Start Up, Bar Hole Mode
GX-2012 Operator’s Manual, CSA Version
If the CO or H2S sensor is installed and fails, press and release the
RESET SILENCE button to acknowledge the failure and continue to Bar
Hole Mode.
13. The GX-2012 is now operating in Bar Hole Mode. The pump is off and
the following screen appears.
BAR HOLE MODE
CH4
O2
0
20.9
%LEL
%
001
The methane and oxygen channels are displayed along with the battery
charge level.
Performing a Fresh Air Adjustment, Bar Hole Mode
Before using the GX-2012, it is recommended to set the fresh air readings for
the target gases by performing a fresh air adjustment. This will set the
combustible gas channel to zero and the OXY channel to 20.9%.
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-2012, Bar
Hole Mode”.
3. Press and hold the AIRS button. The pump will start and the display will
prompt you to hold the AIRS button.
4. Continue to hold the AIRS button until the display prompts you to
release the AIRS button. The GX-2012 will set the fresh air reading for
the CH4 and oxygen channels as it counts down from 8. Once the
countdown has finished, start up is complete and the unit is ready for bar
hole testing.
GX-2012 Operator’s Manual, CSA Version
Start Up, Bar Hole Mode • 79
Bar Hole Testing
In Bar Hole Mode, the you can initiate sampling for a fixed time period to
monitor for methane and oxygen in a bar hole. The factory set time is 30
seconds. To change the bar hole sampling time, see “Updating the Bar Hole
Sampling Time” on page 138. At the end of the sample period, the pump will
shut off and the peak methane and minimum oxygen levels monitored during
the sample period will be displayed. Bar Hole Mode also allows you to
initiate an air purge cycle to purge gas from the GX-2012 after a sample is
taken.
In a low-light environment, press and release the (SHIFT)T button to turn on
the display backlight. Although the backlight will turn on when any button is
pressed, other buttons may initiate an undesired operation sequence. See
“Updating the LCD Back Light Time Setting” on page 135 to program
backlight duration. If BEEP. SET is turned on in the Maintenance Mode
menu, the GX-2012 beeps once every 5 minutes to confirm that it’s
operating.
While in Bar Hole Mode, you may select or change the current station ID by
pressing the (SHIFT)T button and DISPLAY (ADJ) button and releasing
when you hear a beep.
Performing a Bar Hole Test
1. Start up the GX-2012 as described in “Start Up, Bar Hole Mode” on
page 73.
2. If you wish to change the station ID, press the (SHIFT)T and DISPLAY
(ADJ) buttons and release when you hear a beep. The current station ID
will be displayed and it will be flashing. If you wish to exit the Station ID
Select Screen without making any changes, press and release the RESET
SILENCE button.
S Id
SEL
001
80 • Bar Hole Testing
GX-2012 Operator’s Manual, CSA Version
Use the AIRS and (SHIFT)T buttons to scroll to the desired station ID
and press and release POWER ENTER. The unit will return to the Bar
Hole Measuring Screen.
BAR HOLE MODE
CH4
O2
0
0.0
%LEL
%
001
3. Take the GX-2012 to the bar hole that will be tested.
4. Insert the probe into the bar hole and press and release the POWER
ENTER button. The pump will turn on and the sample period will begin
with the sample period counting down in seconds in the lower right
corner of the display. The CH4 channel will be displayed in %VOL. The
methane channel’s reading will also be displayed in graph format on the
left side of the screen. If you wish to cancel the measurement, press and
release the RESET SILENCE button.
BAR HOLE MODE
CH4
O2
25
20.9
30
MEASURE
vol%
%
sec
5. After 15 seconds of sampling, if the combustible gas reading is less than
5 %VOL, the combustible gas channel will automatically begin
displaying in %LEL.
GX-2012 Operator’s Manual, CSA Version
Bar Hole Testing • 81
6. At the end of the sample period, the pump will shut off and the buzzer
will sound, then the peak methane reading and the minimum oxygen
reading for the sample period will be displayed. The peak methane
reading will also be visually displayed on the graph along the left side of
the screen.
BAR HOLE MODE
25
19.0
CH4
O2
%LEL
%
PEAK
PEAK
7. If a high concentration of methane is encountered, a fresh air purge can
be performed to purge the hose, probe and GX-2012 of gas before the
next bar hole test. To perform a purge, do the following:
•
Remove the probe from the barhole so the instrument will draw fresh
air.
•
Press and release the DISPLAY (ADJ) button. The display will now
indicate PURGE along the bottom of the screen and the purge time
will begin counting down from 30 seconds in the lower right corner
of the display. If you wish to cancel the purge, press and release the
RESET SILENCE button.
BAR HOLE MODE
CH4
O2
0
20.9
30
vol%
%
sec
PURGE
•
When the purge is complete, the screen will return to the initial Bar
Hole Mode screen.
BAR HOLE MODE
CH4
O2
0
20.9
%LEL
%
001
82 • Bar Hole Testing
GX-2012 Operator’s Manual, CSA Version
8. If other bar holes will be tested, proceed to the next bar hole and repeat
steps 4 - 7.
9. To cancel a bar hole measurement or fresh air purge that is in progress,
press and release the RESET SILENCE button.
10. To exit Bar Hole Mode and return to the Mode Select Screen at any time,
press and hold the (SHIFT)T button for 5 seconds.
Turning Off the GX-2012, Bar Hole Mode
1. Press and hold the POWER ENTER button.
2. The unit will initiate a bar hole measurement. Keep holding the POWER
ENTER button. The buzzer will pulse for about three seconds and TURN
OFF will appear at the bottom of the screen.
3. Release the button when TURN OFF disappears.
GX-2012 Operator’s Manual, CSA Version
Bar Hole Testing • 83
Chapter 5: Using the GX-2012 in Leak Check Mode
Overview
This chapter explains how to operate the GX-2012 in Leak Check Mode.
Leak Check Mode is used to pinpoint small leaks of combustible gas from
valves, flanges, connections, and other potential leak points. When the GX2012 is in Leak Check Mode, only the combustible channel is displayed.
If a GX-2012 is intended for leak check testing, it is shipped with Leak
Check Mode enabled so that the operator must choose which operational
mode to use when the unit is turned on (see “Turning On the GX-2012 in
Normal Mode With All Modes Active” on page 25).
Start Up, Leak Check Mode
This section explains how to start up the GX-2012 in Leak Check Mode and
get it ready for operation.
NOTE: The battery drain is higher in Leak Check Mode than in Normal
Mode or Bar Hole Mode. Extended operation in this mode will
result in shorter battery life than specified in “Specifications” on
page 3.
Turning On the GX-2012, Leak Check Mode
WARNING: If an oxygen or H2S sensor is installed, these sensors will not
be active while the GX-2012 is in Leak Check Mode.
The following description of the GX-2012 start up sequence assumes that the
following menu items in Maintenance Mode are turned on: LNCH BRK, ID
DISP, CL RMNDR, and BP RMNDR. If either of these items is turned off,
then the corresponding screen will not appear.
NOTE: In order for LEAK CHECK MODE to appear as a selection in the
Mode Select Screen in Step 3 below, the L./B. MODE item in
Maintenance Mode must be set to LC or LC bH. The factory setting
is OFF.
1. Connect the tapered rubber nozzle to the inlet fitting.
2. If a sample hose is used, connect the sample hose to the GX-2012’s quick
connect inlet fitting.
84 • Overview
GX-2012 Operator’s Manual, CSA Version
NOTE: If a probe is used when using the GX-2012 in Leak Check Mode,
use the standard probe, not the bar hole probe.
3. Press and briefly hold down the POWER ENTER button. The Normal
Mode Select Screen displays.
0
O2
20.9
CO
0
H2 S
0.0
NORMAL ?
CH4
vol%
%LEL
%
ppm
ppm
4. Use the AIRS or (SHIFT)T button to scroll to the Leak Check Mode
Select Screen.
LEAK CK MODE
LEAK CK MODE
CH4
0
CH4
ppm
0
0
5000
L.C. MODE?
CO
5000
L.C. MODE?
ppm
CO DISP OFF
ppm
ppm
ppm
CO DISP On
NOTE: If the CO DISP parameter in Maintenance Mode is set to On, the
CO channel will appear in Leak Check Mode. If the CO DISP
parameter is set to OFF (factory setting), the CO channel will not
appear in Leak Check Mode. All screens in this section do not show
the CO channel. If CO DISP is turned on for your instrument, your
screens may appear different.
5. With the Leak Check Mode Select Screen displayed, press and release the
POWER ENTER button to begin the Leak Check Mode startup sequence.
NOTE: If no button is pressed for 20 seconds, the unit will proceed into
whichever mode is displayed.
GX-2012 Operator’s Manual, CSA Version
Start Up, Leak Check Mode • 85
6. If CL RMNDR is turned on (factory setting), the screen that appears next
depends on how CL EXPRD is set in the Maintenance Mode Menu
(page 131).
•
If the unit is due for calibration and CL EXPRD is set to CONFIRM
(factory setting), then the following screen displays.
CAL
C--LIMIT
The alarm LED’s and buzzer will pulse several times. After this,
press and release the RESET SILENCE button to continue.
•
If the unit is due for calibration and CL EXPRD is set to NOT USE,
then the following screen displays.
FAIL
C--LIMIT
The GX-2012 cannot be used until a calibration has been performed
either by selecting AUTO CAL, or ONE CAL in the Maintenance
Mode menu. See “Calibrating Using Auto Calibration” on page 105
or “Calibrating Using Single Calibration” on page 108 for calibration
instructions.
•
If calibration is not due or CL EXPRD is set to NO EFFECT, then
the following screen appears for a few seconds indicating when the
next calibration is due.
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86 • Start Up, Leak Check Mode
GX-2012 Operator’s Manual, CSA Version
7. If BP RMNDR is turned on (factory setting is OFF), the screen that
appears next depends on how BP EXPRD is set in the Maintenance
Mode Menu (page 133).
•
If the unit is due for a bump test and BP EXPRD is set to CONFIRM
(factory setting), then the following screen displays.
tESt
B--LIMIT
The alarm LED’s and buzzer will pulse several times. After this,
press the RESET SILENCE button until you hear a beep to continue.
•
If the unit is due for a bump test and BP EXPRD is set to NOT USE,
then the following screen displays.
FAIL
B--LIMIT
The GX-2012 cannot be used until a bump test has been performed
by selecting BUMP in the Maintenance Mode menu. See
“Performing a Bump Test” on page 111 for bump testing instructions.
•
If a bump test is not due or BP EXPRD is set to NO EFFECT, then
the following screen appears for a few seconds indicating when the
next bump test is due.
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NEXTBUMP
GX-2012 Operator’s Manual, CSA Version
Start Up, Leak Check Mode • 87
NOTE: If both CL RMNDR and BP RMNDR are turned off, a WARM UP
screen will display before the warm up sequence continues.
8. If ID DISP is turned on, the User ID Screen displays for a few seconds
and then the Station ID Screen displays for a few seconds.
U Id
-------S Id
-------9. The Date/Time Screen appears for a few seconds.
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DATE
This screen displays the current year, month, date, and time.
10. The Battery Level and Alarm Pattern Screen appears next.
bAtt
3.7
AL-H
V
AL -- H indicates latching (hold) alarms and AL -- A indicates selfresetting (automatic) alarms. The number shown indicates the voltage of
88 • Start Up, Leak Check Mode
GX-2012 Operator’s Manual, CSA Version
the batteries. If the unit is powered by alkaline (dry cell) batteries, a “D”
will appear before the “V” in the lower right corner.
bAtt
3.7
AL-H D: V
11. The display then indicates the full scale values for all channels.
12. If the GX-2012 experiences a sensor failure during start up, a screen
indicating which sensor failed displays. In the example below, the
catalytic LEL sensor has failed.
CH4
FAIL
%LEL
SENSOR
If the catalytic LEL sensor fails, it is not possible to enter Leak Check
Mode. Press and release the RESET SILENCE button twice to
acknowledge the failure and return to the Mode Select Screen. Replace
the failed sensor as soon as possible.
If the oxygen, CO, or H2S sensor is installed and fails, press and release
the RESET SILENCE button to acknowledge the failure and continue to
Leak Check Mode.
If a vol% sensor is installed and fails, no indication will be given and the
unit will enter Leak Check Mode.
13. The GX-2012 is now operating in Leak Check Mode.
LEAK CK MODE
CH4
0
ppm
5000
ppm
F.S.
GX-2012 Operator’s Manual, CSA Version
Start Up, Leak Check Mode • 89
The combustible gas reading is displayed along with the battery charge
level.
Performing a Fresh Air Adjustment, Leak Check Mode
Before using the GX-2012 for leak checking, it is recommended to set the
fresh air reading by performing a fresh air adjustment. This will set the
combustible gas channel to zero. RKI Instruments recommends allowing the
GX-2012 to run for as long as possible after turning on the instrument before
performing a fresh air adjustment.
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-2012, Leak
Check Mode” on page 84.
3. Press and hold the AIRS button. The display will prompt you to hold the
AIRS button.
AIr
CAL
HOLD AIR
4. Continue to hold the AIRS button until the display prompts you to
release the AIRS button. The GX-2012 will set the fresh air reading for
the combustible channel. Once the fresh air adjustment has finished, start
up is complete and the unit is ready for leak testing.
5. If you would like to calibrate the GX-2012 while in Leak Check Mode,
follow the same instructions described in “Calibration Mode” on page 57.
Leak Testing
In Leak Check Mode, the GX-2012 only displays combustible gas readings.
The increment of the reading is always 100 ppm but the display range can be
adjusted by using the DISPLAY (ADJ) button. The display range choices are
500 ppm, 1000 ppm, 2000 ppm, and 5000 ppm. The readings are displayed in
both numerical and bar graph form. As the gas concentration increases from
0 ppm, the alarm LEDs begin to blink in unison with the buzzer’s pulsing.
The blinking/pulsing rate increases as the gas reading increases. If desired the
buzzer can be turned off in Leak Check Mode.
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GX-2012 Operator’s Manual, CSA Version
In a low-light environment, press and release any of the buttons to turn on the
display backlight. If BEEP. SET is turned on in Maintenance Mode, the GX2012 beeps once every 5 minutes to confirm that it’s operating.
Setting the Display Range Value
The GX-2012 Leak Check Mode has 4 display range ppm values to choose
from: 500 ppm, 1000 ppm, 2000 ppm, and 5000 ppm.
NOTE: The GX-2012 is always detecting combustible gas up to 5000 ppm.
The display range value is only adjusting what part of the detection
range is displayed on the LCD.
To change the display range value:
1. While in Leak Check Mode, press and release the DISPLAY (ADJ)
button. The display range value displayed along the bottom of the screen
will change.
LEAK CK MODE
CH4
0
500
ppm
ppm
F.S.
Continue to press and release the DISPLAY (ADJ) button until the
desired display range value is displayed.
2. The unit is now operating with the selected display range.
Locating a Leak
1. Start up the GX-2012 as described above in “Turning On the GX-2012,
Leak Check Mode” on page 84.
2. Move the probe tip or tapered nozzle tip back and forth along the area
where a leak is suspected.
3. Observe the display reading. If the gas level increases, the numerical
reading will increase, the bar graph level will increase, and the beeping
and buzzer pulsing frequency will increase.
4. Your gas reading may exceed your display range or 100% LEL. For a
description of both scenarios, see the following section.
5. Use the increasing and decreasing of the reading to locate the leak point.
6. To exit Leak Check Mode and return to the Leak Check Mode Select
Screen at any time, press and hold the (SHIFT)T button for 5 seconds.
GX-2012 Operator’s Manual, CSA Version
Leak Testing • 91
Overscale Conditions
There are three overscale conditions that the GX-2012 may experience while
operating in Leak Check Mode.
• Exceeding display range
If you are using a display range of 500, 1000, or 2000 ppm and the gas
level goes above the display range, the full scale value of the display
range will be displayed but it will not be an overscale condition unless the
gas level is above 5000 ppm.
• Exceeding 5000 ppm
If the combustible gas level exceeds 5000 ppm, the GX-2012 will display
an overscale condition but will continue displaying the gas reading in
%LEL.
LEAK CK MODE
CH4
32
5000
OVER
%LEL
ppm
• Exceeding 100% LEL
If the combustible gas level exceeds 100% LEL, the GX-2012 will display
an overscale alarm.
LEAK CK MODE
CH4
%LEL
5000
OVER
ppm
NOTE: If a vol% sensor is installed, “OVER” will still appear at the bottom
of the screen but the instrument will display the gas reading in
%volume.
The GX-2012 will continue to be in overscale alarm until the gas reading
decreases. The instrument will then show readings in the LEL range until
the readings decrease back to the ppm range.
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GX-2012 Operator’s Manual, CSA Version
Turning the Alarm On and Off in Leak Check Mode
The alarm buzzer can be turned off and on when the GX-2012 is in Leak
Check Mode. This setting only applies to Leak Check Mode and does not
affect buzzer operation in Normal or Bar Hole Mode. When the buzzer is set
to Off, NO ALARM appears in the upper left hand corner of the display. If
the buzzer is turned off, then it will remain off in Leak Check Mode even if
you enter Normal Mode or Bar Hole Mode and return to Leak Check Mode
or turn the unit off and on unless the buzzer is manually turned on.
To turn the buzzer off or on while in Leak Check Mode:
1. Press and hold the DISPLAY(ADJ) button for 5 seconds.
NOTE: Pressing and holding the DISPLAY (ADJ) button will change the
full scale setting for Leak Check Mode. Once you have made your
buzzer selection, use the DISPLAY (ADJ) button to display the
desired full scale.
2. Release the button when NO ALARM in the upper left corner appears or
disappears.
Peak Hold Mode
Peak Hold Mode allows the user to view the peak methane reading for the
operating session while viewing the current methane reading.
To enter Peak Hold Mode:
1. Turn the GX-2012 on as described in “Turning On the GX-2012, Leak
Check Mode” on page 84. Select the desired display range. In the
example below, 500 ppm has been selected.
2. Press and hold the RESET SILENCE button until the Peak Hold Mode
screen displays.
LEAK CK MODE
CH4
PEAK
400
PH
500
500
ppm
ppm
ppm
F.S.
The current methane reading is displayed on the first line. The “PH”
shown on the second line indicates that the GX-2012 is in Peak Hold
Mode. The peak methane reading is displayed on the third line. The full
scale value is displayed on the fourth line.
GX-2012 Operator’s Manual, CSA Version
Leak Testing • 93
3. The peak reading displayed while in Leak Check Mode will appear in the
Peak Hold Mode screen.
4. If the highest reading recorded is higher than the full scale value, the full
scale value will be displayed. If the full scale value is changed to
something higher, the real value for the peak will be displayed.
5. To reset the peak, press and hold the RESET SILENCE button until you
hear a beep, then release it.
6. To exit Peak Hold Mode and return to Leak Check Mode, press and hold
the RESET SILENCE button until you hear the GX-2012’s second beep
and the Leak Check Mode Screen displays.
Snap Log Mode, Leak Check Mode Operation
The snap logging function in Snap Log Mode allows the user to record data at
a specific time and have it saved to the data logger. The data is assigned a
snap log ID and is saved with the station ID that was selected when the data
was taken.
To enter Snap Log Mode and record snap log data:
1. Turn the GX-2012 on as described in “Turning On the GX-2012, Leak
Check Mode” on page 84. Select the desired display range. In the
example below, 500 ppm has been selected. Press and hold the
(SHIFT)T button, then press and hold the AIRS button and hold both
until you hear a beep. The Station ID Select Screen will display and the
current station ID will be flashing.
NOTE: If the gas levels reach a warning or alarm condition while in this
screen, the GX-2012 will go into alarm.
S Id
SEL
001
94 • Leak Testing
GX-2012 Operator’s Manual, CSA Version
2. Use the (SHIFT)T and AIRS buttons to scroll to the desired station ID,
then press and release the POWER ENTER button to continue to the
Base Reading Screen. To return to the Station ID Select Screen without
taking a base reading, press and release the RESET SILENCE button.
LEAK CK MODE
CH4
0
500
ppm
ppm
BASE
3. In order to get a base, or background, reading, take the instrument a few
feet away from where you intend to test. To save the base reading, press
and release the POWER ENTER button.
NOTE: If the gas concentration exceeds the display range value without
exceeding 5000 ppm, the full scale display range value will be
displayed but the actual gas reading at that time will be recorded
when you press and release POWER ENTER. For example, if the
display range is 500 ppm but the gas level is 2300 ppm, the display
will read 500 ppm but the instrument will save a reading of 2300
ppm.
If the gas concentration exceeds 5000 ppm in the Base
Reading Screen, the instrument will go into an overscale
alarm. The full scale display range value will be displayed but
OVER will be recorded when you press POWER ENTER. The
full scale display range value will continue to be displayed in
the Peak Reading Screen and OVER will again be recorded
when you press POWER ENTER.
4. The unit will display SAVED along the bottom of the screen before
continuing to the Peak Reading Screen.
LEAK CK MODE
CH4
PEAK
0
ppm
500
ppm
PEAK
GX-2012 Operator’s Manual, CSA Version
Leak Testing • 95
5. Take the instrument to the monitoring area. The instrument will retain
and display the highest gas concentration encountered. To save the peak
reading, press and release the POWER ENTER button. The reading on
the screen (the highest concentration encountered) will be saved.
NOTE: If the gas concentration exceeds the display range without
exceeding 5000 ppm, the full scale display range value will be
displayed but the actual gas reading at that time will be recorded
when you press and release POWER ENTER. For example, if the
display range is 500 ppm but the gas level is 2300 ppm, the display
will read 500 ppm but the instrument will save a reading of 2300
ppm.
If the gas concentration exceeds 5000 ppm in the Peak
Reading Screen, the instrument will go into an overscale
alarm. The full scale display range value will be displayed
and OVER will be recorded when you press POWER ENTER.
The unit will display SAVED along the bottom of the screen before
returning to the Station ID Select Screen.
To return to the Station ID Select Screen without taking a peak reading,
press and release the RESET SILENCE button.
6. Repeat steps 2 through 5 to take additional snap log data.
7. To exit Snap Log Mode at any time without taking a snap log or when
you are finished recording snap logs, press and release the DISPLAY
(ADJ) button. The unit will immediately return to the Normal Operation
Screen.
8. The data recorded in Snap Log Mode can be viewed in Display Mode.
See “Snap Logging Screen” on page 53 for more information.
Viewing Snap Log Data in Leak Check Mode Operation
Snap log data can be viewed while in Leak Check Mode. If snap log data was
taken while in Normal Operation, that data will also appear.
1. Turn the GX-2012 on as described in “Turning On the GX-2012, Leak
Check Mode” on page 84.
2. Press and hold the RESET SILENCE button and then press and hold the
DISPLAY (ADJ) button and release both.
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GX-2012 Operator’s Manual, CSA Version
3. If no snap logs have been performed, the following screen will appear.
NO DATA
Press and release the DISPLAY (ADJ) button to return to Leak Check
Mode.
4. If snap logs have been performed in either Normal Operation or Leak
Check Mode Operation, one of the following screens will appear. LEAK
CK MODE will appear in the upper left corner of Leak Check Mode
Operation data to indicate that the snap log was taken during Leak Check
Mode Operation.
LEAK CK MODE
2011
8
31
22:39
M023
Normal Operation
Snap Log
2012
2
15
14:17
M009
Leak Check Mode Operation
Snap Log
This screen indicates the year, month, day, and time that the most recent
snap log was taken. The number along the bottom of the screen indicates
the snap log ID number. The first snap log that is taken is given an ID of
M001. The next snap log ID is M002. The ID number increases
sequentially with each set of snap log data. Use the AIRS and
(SHIFT)T buttons to scroll through different snap log IDs and view what
time and day they were taken. Snap log data that was taken in Leak
Check Mode operation will have two snap log ID numbers. One number
is for the base reading and the other is for the peak reading.
GX-2012 Operator’s Manual, CSA Version
Leak Testing • 97
5. To view the data in a snap log ID, press and release the POWER ENTER
button. You can also go back and forth between the ID and data screens
by pressing and releasing the POWER ENTER button.
2011
8
31
22:39
M011
Normal
Operation
Data
AIRS
(SHIFT)T
AIRS
ENTER
CO
50
23.5
50
%LEL
%
ppm
BLDNG 1
LEAK CK MODE
2012
2
15
14:18
M010
AIRS
Leak Check
Mode Operation
Base Data
O2
LEAK CK MODE
Leak Check
Mode Operation
Peak Data
(SHIFT)T
CH4
POWER
CH4
POWER
4500
ppm
ENTER
5000
VALVE 3
ppm
PEAK
LEAK CK MODE
LEAK CK MODE
2012
2
15
14:17
M009
CH4
POWER
0
ppm
ENTER
5000
VALVE 3
ppm
(SHIFT)T
Normal
Operation
Data
2011
8
31
22:39
M007
POWER
ENTER
CH4
O2
CO
35
22.0
45
%LEL
%
ppm
RIG
The gas readings that were taken during the snap log are displayed and
the Station ID that was in use during the snap log is displayed along the
bottom of the screen. Snap log data that was taken in Leak Check Mode
operation will have 2 sequential screens that are part of one data set. One
screen is for the base reading and the other screen is for the peak reading.
The peak reading value will have PEAK displayed below the peak bar. If
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GX-2012 Operator’s Manual, CSA Version
a base data point appears without a peak data point after it, it is because a
peak data point was not taken. You can use the AIRS and (SHIFT)T
buttons to scroll through the different snap logs. The gas readings and
station ID will change but the snap log ID is not visible from this screen.
6. To exit snap log data viewing and return to Leak Check Mode Operation,
press and release the DISPLAY (ADJ) button.
Turning Off the GX-2012, Leak Check Mode
1. Press and hold the POWER ENTER button.
2. The buzzer will pulse for about three seconds and TURN OFF will
appear at the bottom of the screen.
3. Release the button when TURN OFF disappears.
GX-2012 Operator’s Manual, CSA Version
Leak Testing • 99
Chapter 6: Maintenance Mode
Overview
This chapter describes the GX-2012 in Maintenance Mode. In Maintenance
Mode, you can:
• update the date and time
• perform a fresh air adjust
• perform an auto calibration
• perform a single calibration
• perform a bump test
• turn the lunch break setting on or off
• update the alarm latching setting
• turn alarm silencing on or off
• update the interval trend time setting
• update warning, alarm, STEL, and TWA settings
• turn the clear data logger screen on or off
• turn the bump test function on or off
• turn the pump off screen on or off
• update bump test parameters
• update the confirmation beep setting
• update the data logger overwrite setting
• update the calibration interval setting
• turn the calibration reminder function on or off
• update the calibration expired action setting
• update the calibration check setting
• update the bump test interval setting
• turn the bump test reminder function on or off
• update the bump test expired action setting
• update the bump test check setting
• turn the ID display function on or off
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GX-2012 Operator’s Manual, CSA Version
• update the backlight settings
• turn the autozero function on or off
• turn the demand zero function on or off
• update the Leak Check/Bar Hole Mode setting
• update the bar hole sampling time
• turn Portuguese on or off
• update the Leak Check Mode CO channel display setting
• view the instrument’s firmware version and checksum information
• turn the password function on or off and set the password
The GX-2012 is factory-set to suit most applications. Update settings in
Maintenance Mode only if required for your specific application.
Tips for Using Maintenance Mode
• Use (SHIFT)T to scroll down through the main menu and submenus, and
to lower values or change the setting in a specific option.
• Use AIRS to scroll up through the main menu and submenus, and to raise
values or change the setting in a specific option.
• Use the POWER ENTER button to enter a selected menu item, and to
enter and save settings that have been updated.
• An adjustable parameter that is flashing can be adjusted with the AIRS
and (SHIFT)T buttons.
• Press the DISPLAY (ADJ) button while entering or updating parameters
to exit the screen without saving any changes.
Using Maintenance Mode
WARNING: The GX-2012 is not in operation as a gas detector while in
Maintenance Mode. Although it will respond to gas in parts
of AUTO CAL and ONE CAL, there are no alarm
indications.
1. Take the GX-2012 to a non-hazardous location, and turn it off if it is on.
GX-2012 Operator’s Manual, CSA Version
Tips for Using Maintenance Mode • 101
2. Press and hold the AIRS and (SHIFT)T buttons, then press and hold the
POWER ENTER button. When you hear a beep, release the buttons.
MAINTENANCE
0000
PASSWORD
The unit will prompt you for a password.
3. Enter the password by using the AIRS and (SHIFT)T buttons to select
each password number and then pressing and releasing POWER ENTER
to enter it and move on to the next one. To go back a number, press and
release the RESET SILENCE button.
NOTE: A password is always needed to enter Maintenance Mode even if the
PASSWORD menu item in Maintenance Mode has been turned off
(factory setting). The factory set password is 2102. You may change
this password by entering the PASSWORD menu item in
Maintenance Mode.
4. If you enter an incorrect password, an error screen will appear.
Err
PASSWORD
You must turn the unit off and reenter Maintenance Mode using the
correct password.
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GX-2012 Operator’s Manual, CSA Version
5. Once you enter Maintenance Mode, MAINTENANCE will appear along
the top of the screen. The Date Screen displays.
MAINTENANCE
DATE
6. Use the AIRS or (SHIFT)T button to move through the menu item
screens.
Updating the Date and Time Settings
1. Use the AIRS or (SHIFT)T buttons to display the DATE menu item.
MAINTENANCE
DATE
Press and release the POWER ENTER button. The date and time will be
displayed with the year flashing.
MAINTENANCE
2011
4
23
22:37
DATE
2. Use the AIRS or (SHIFT)T button to display the desired year.
3. Press and release the POWER ENTER button to save the setting. The
month setting flashes.
4. Repeat steps 2 and 3 to enter the month, day, hours, and minutes settings.
The Date menu item displays after you enter the minutes setting.
Performing a Fresh Air Adjustment
1. Confirm you are in a fresh air environment that is free of toxic and
combustible gases and of normal oxygen concentration, 20.9%.
GX-2012 Operator’s Manual, CSA Version
Using Maintenance Mode • 103
2. Use the AIRS or (SHIFT)T buttons to navigate to the AIR CAL menu
option.
MAINTENANCE
AIR CAL
3. Press and release the POWER ENTER button to enter AIR CAL. The
current gas readings are displayed.
MAINTENANCE
0
O2
20.9
CO
0
H2 S
0.0
PUSH AIR
CH4
%LEL
%
ppm
ppm
4. Hold down the AIRS button. The unit will prompt you to continue
holding the AIRS button.
MAINTENANCE
AIr
CAL
HOLD AIR
5. When the unit tells you to release the AIRS button, release it. The unit
will count down from 8 as it performs the fresh air adjust.
MAINTENANCE
AdJ
8
sec
RELEASE
Once it has finished, it will return to the AIR CAL menu screen.
104 • Using Maintenance Mode
GX-2012 Operator’s Manual, CSA Version
Calibrating Using Auto Calibration
If CL EXPRD is set to NOT USE and calibration becomes due, then the unit
must be calibrated using this menu item and/or the next menu item, ONE
CAL, because it will not be possible to enter normal operation. See
“Calibration/Bump Test Supplies and Equipment” on page 57 for the items
you will need to perform a calibration. These instructions assume you are
using a 4-gas cylinder and a %volume methane cylinder.
NOTE: If the combustible gas channel(s) are calibrated to a gas other
than methane, use an appropriate multigas cylinder or use
single calibration to calibrate the combustible channel(s).
1. Perform a fresh air adjust. See previous section for instructions.
2. Install the demand flow regulator onto the calibration cylinder.
3. Connect the sample tubing to the demand flow regulator.
4. Install the hose and probe to the GX-2012.
5. You may only calibrate either the standard 4 sensors or the % volume
combustible gas sensor at a time. Once you are finished, you are returned
to the initial AUTO CAL screen and must begin the auto calibration
process again.
6. Use the AIRS or (SHIFT)T buttons to display the AUTO CAL menu
item. Press and release the POWER ENTER button to display the
calibration values screen. If you want to exit back to the main menu
without completing a calibration, press and release the DISPLAY (ADJ)
button.
GX-2012 Operator’s Manual, CSA Version
Using Maintenance Mode • 105
7. Use the AIRS or (SHIFT)T button to alternate between the 4-gas and
the %volume combustible gas calibration values screen.
MAINTENANCE
50
O2
12.0
CO
50
H2 S
25.0
AUTO CAL
CH4
%LEL
%
ppm
ppm
MAINTENANCE
CH4
100
vol%
AUTO CAL
8. The gas concentrations displayed in the calibration values screens must
match the gas concentrations listed on the calibration cylinders. If all
concentrations match, go to step 16. If one or more concentrations do not
match, continue with step 9.
9. To adjust the values on the screens, hold down the (SHIFT)T button,
then press the DISPLAY(ADJ) button and release both. The %LEL
sensor is shown.
MAINTENANCE
CH4
---
%LEL
AUTO CAL
10. Use the AIRS and (SHIFT)T buttons to scroll through the sensors and
select the sensor whose calibration gas value you want to adjust.
11. Press and release the POWER ENTER button. The sensor’s calibration
gas value will flash.
12. If necessary, use the AIRS and (SHIFT)T buttons to set the correct
calibration gas value.
13. Press and release the POWER ENTER button to save the change.
14. Repeat steps 10 through 13 to set the correct values for any additional
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GX-2012 Operator’s Manual, CSA Version
sensors.
15. After the last calibration gas value is set, use the AIRS button to scroll to
ESCAPE and press POWER ENTER to return to the calibration gas
values screen.
NOTE: The RKI Four Gas Cylinder typically contains 12% O2 by volume.
Be sure to set the “OXY” reading to agree with the concentration
listed on the cylinder’s label, not zero.
16. Use the AIRS and (SHIFT)T buttons to select which sensor(s) you want
to calibrate, the standard 4 sensors or the %volume combustible gas
sensor.
The following instructions illustrate calibrating the standard 4 sensor
first, then the %volume combustible gas sensor.
17. With the calibration values screen displayed, press the POWER ENTER
button. AUTO CAL begins to flash and the current gas readings are
displayed.
MAINTENANCE
0
O2
20.9
CO
0
H2 S
0.0
AUTO CAL
CH4
%LEL
%
ppm
ppm
18. Connect the tubing from the demand flow regulator to the rigid tube on
the probe. Allow the gas to flow for one minute.
GX-2012 Operator’s Manual, CSA Version
Using Maintenance Mode • 107
19. Press and release the POWER ENTER button to set the calibration to the
programmed values.
If all channels passed calibration, PASS displays along the bottom of the
screen, then the calibration menu displays.
If any of the sensors cannot calibrate to the proper value, FAIL displays
along the bottom of the screen and the GX-2012 lists the sensor(s) that
failed to calibrate. In the example below, the OXY and H2S channels
failed calibration. The other sensors calibrated normally.
MAINTENANCE
O2
%
H2 S
ppm
FAIL
The buzzer and alarm lights activate. Press and release the RESET
SILENCE button after the buzzer and lights stop to reset the alarm and
return to the calibration menu. Attempt to calibrate again. If the failure
continues, investigate the cause. See “Troubleshooting” on page 143.
20. Disconnect the tubing from the probe.
21. Unscrew the demand flow regulator from the calibration cylinder.
22. If you have a 5 sensor unit and wish to calibrate the %volume
combustible gas sensor, go back to step 1 and repeat the process,
selecting the %volume calibration gas value screen in step 16 and using a
%volume methane calibration cylinder.
If you are finished calibrating, use the (SHIFT)T button to navigate to
the NORMAL menu item, then press and release the POWER ENTER
button to return to Measuring Mode.
Calibrating Using Single Calibration
If CL EXPRD is set to NOT USE and calibration becomes due, then the unit
must be calibrated using this menu item and/or the previous menu item,
AUTO CAL because it will not be possible to enter normal operation. See
“Calibration/Bump Test Supplies and Equipment” on page 57 for the items
you will need to perform a calibration.
The procedure below describes a span adjustment of one channel
using a calibration kit that includes a 4-gas calibration cylinder, a 0.5
LPM (liters per minute) regulator, and non-absorbent sample tubing.
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GX-2012 Operator’s Manual, CSA Version
The standard 4-gas cylinder consists of 50% LEL methane, 12%
oxygen, 50 ppm CO, 25 ppm H2S, and a balance of nitrogen. In the
example below, the CH4 channel’s span is adjusted. See “Parts List”
on page 159 for available calibration kits and calibration kit spare
parts.
Calibration cylinders that contain only one target gas may also be
used for single calibration. For channels other than oxygen, RKI
Instruments, Inc. recommends that you use a cylinder that contains a
concentration of 10-50% of the full scale value of the target gas. For
example, if you are calibrating the combustible gas channel, your
calibration cylinder should have a combustible gas concentration
between 10% LEL and 50% LEL. For the oxygen channel, RKI
Instruments, Inc. recommends using 100% nitrogen to perform the
adjustment but any concentration between 0% oxygen (100%
nitrogen) and 17% oxygen can be used to make the adjustment.
NOTE: If your combustible gas channel is calibrated to a gas other
than methane, use an appropriate gas cylinder to perform the
calibration.
CAUTION: The single calibration method does not have a “FAIL”
notification. If a sensor cannot be set to agree with the
calibration source, see “Troubleshooting” on page 143.
1. Perform a fresh air adjust. See “Performing a Fresh Air Adjustment” on
page 103 for instructions.
2. Install the demand flow regulator onto the calibration cylinder.
3. Connect the sample tubing to the demand flow regulator.
4. Install the hose and probe to the GX-2012.
5. Use the AIRS or (SHIFT)T buttons to scroll to the ONE CAL menu
option.
MAINTENANCE
ONE CAL
GX-2012 Operator’s Manual, CSA Version
Using Maintenance Mode • 109
6. Press and release the POWER ENTER button to display the single
calibration menu. The %LEL sensor will be displayed first.
MAINTENANCE
CH4
---
%LEL
ONE CAL
7. Use the AIRS or (SHIFT)T button to display the sensor you want to
calibrate (in this example the combustible gas % LEL sensor). If you
have a 5 sensor unit, the %vol sensor will be one of the choices. It is
shown below.
MAINTENANCE
CH4
---
vol%
ONE CAL
8. Press and release the POWER ENTER button. The single calibration
screen displays for the sensor you selected. The gas reading flashes.
MAINTENANCE
CH4
0
%LEL
ONE CAL
9. Connect the tubing from the demand flow regulator to the rigid tube on
the probe. Allow the calibration gas to flow for one minute.
10. If necessary, use the AIRS and (SHIFT)T buttons to adjust the reading
to match the concentration listed on the calibration cylinder.
If the reading already matches the concentration listed on the calibration
cylinder, press and release the AIRS button then press and release the
(SHIFT)T button so that the instrument sees a change and resets the
calibration date.
11. Press and release the POWER ENTER button to save the span value. The
110 • Using Maintenance Mode
GX-2012 Operator’s Manual, CSA Version
LCD will indicate that the calibration has ended, then the single
calibration menu displays.
12. Disconnect the tubing from the probe.
13. Repeat steps 2 through 12 for any other sensors you want to calibrate.
Make sure you use an appropriate calibration cylinder for each sensor.
CAUTION: When calibrating the oxygen channel, verify the concentration
of oxygen listed on the cylinder’s label. For oxygen-free samples
(100% nitrogen for example), set the oxygen zero setting to
0.0%.
14. After the last channel is calibrated, disconnect the calibration tubing from
the probe, then unscrew the demand flow regulator from the calibration
cylinder.
15. Use the AIRS and (SHIFT)T buttons to scroll to ESCAPE in the ONE
CAL menu.
16. With the ONE CAL menu option displayed, press the (SHIFT)T button
until the NORMAL menu option is displayed.
17. Press and release the POWER ENTER button to return to Measuring
Mode.
Performing a Bump Test
NOTE: The BUMP DSP menu item in Maintenance Mode is factory set to
OFF. The BUMP menu item will not appear unless BUMP DSP is
set to ON. See “Turning the Bump Test Function On or Off” on
page 125 for instructions.
NOTE: The GX-2012 uses parameters defined in the BUMP--SET menu
item of Maintenance Mode while performing a bump test. To view
or update these parameters, see “Updating the Bump Test
Parameters” on page 127.
NOTE: If the combustible gas channel(s) are calibrated to a gas other
than methane, use an appropriate multigas cylinder.
If the BP RMNDR menu item in Maintenance Mode is set to ON (see
“Updating the Bump Test Reminder Setting” on page 133), and the BP
EXPRD menu item in Maintenance Mode is set to NOT USE (see “Updating
the Bump Test Expired Action Setting” on page 133) and a bump test
becomes due, then the sensors must be bump tested using this menu item
because it will not be possible to enter normal operation. See “Calibration/
Bump Test Supplies and Equipment” on page 57 for the items you will need
GX-2012 Operator’s Manual, CSA Version
Using Maintenance Mode • 111
to perform a bump test. These instructions assume you are using a 4-gas
cylinder and a %volume cylinder.
1. Before performing a bump test, perform a fresh air adjustment as
described in “Performing a Fresh Air Adjustment” on page 103.
2. Install the demand flow regulator onto the calibration cylinder.
3. Connect the sample tubing to the demand flow regulator.
4. Install the hose and probe to the GX-2012.
5. Use the AIRS or (SHIFT)T buttons to display the BUMP menu item.
MAINTENANCE
BUMP
6. Press and release the POWER ENTER button to display the bump test
gas values.
MAINTENANCE
50
O2
12.0
CO
50
H2 S
25.0
BUMP 30
CH4
%LEL
%
ppm
ppm
7. Use the AIRS or (SHIFT)T buttons to see the %volume combustible
gas bump test value.
MAINTENANCE
CH4
BUMP
100
vol%
30
NOTE: If you wish to change any of the bump test gas values, you must exit
the BUMP menu item and enter the AUTO CAL menu item. See
steps 8 through 15 in “Calibrating Using Auto Calibration” on
page 105 for instructions to change the gas values.
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GX-2012 Operator’s Manual, CSA Version
8. A bump test may be performed on the standard 4 sensors or on the
%volume combustible sensor. Use the AIRS or (SHIFT)T buttons to
display the screen for the sensor(s) you wish to bump test.
9. Before proceeding, confirm that the bump test gas value(s) are the same
as the concentration(s) in the calibration cylinder. If they are not, adjust
the bump test gas value(s) by entering the AUTO CAL menu item,
changing the values there, and reentering the BUMP menu.
10. Connect the tubing from the demand flow regulator to the rigid tube on
the probe and quickly press and release the POWER ENTER button. The
unit will begin counting down from 30.
11. When AUTO CAL in the BUMP--SET menu item in Maintenance Mode
is set to OFF:
•
The instrument will indicate which channels passed or failed the
bump test with a P (pass) or an F (fail) to the right of the gas.
MAINTENANCE
CH4
O2
CO
H2 S
F
P
F
P
%LEL
%
ppm
ppm
BUMP
•
To view the bump test gas readings press the AIRS or (SHIFT)T
button. You can scroll between the bump test results and the bump
test gas readings with the AIRS or (SHIFT)T button.
MAINTENANCE
CH4
O2
CO
H2 S
5
12.0
10
25.0
%LEL
%
ppm
ppm
BUMP
GX-2012 Operator’s Manual, CSA Version
Using Maintenance Mode • 113
•
To return to the main menu, press POWER ENTER.
MAINTENANCE
BUMP
If one or more sensors fail the bump test, see “Troubleshooting” on
page 143 to investigate the cause of the failure and replace the failed
sensor or sensors if necessary.
•
Disconnect the tubing from the probe.
12. When AUTO CAL in the BUMP--SET menu item in Maintenance Mode
is set to ON:
If all channels pass the bump test,
•
The following screen appears:
MAINTENANCE
CH4
O2
CO
H2 S
F
P
F
P
%LEL
%
ppm
ppm
BUMP
•
To view the bump test gas readings press the AIRS or (SHIFT)T
button. You can scroll between the bump test results and the bump
test gas readings with the AIRS or (SHIFT)T button.
MAINTENANCE
CH4
O2
CO
H2 S
45
12.0
47
23.0
%LEL
%
ppm
ppm
BUMP
114 • Using Maintenance Mode
GX-2012 Operator’s Manual, CSA Version
•
To return to the main menu, press POWER ENTER.
MAINTENANCE
BUMP
•
Disconnect the tubing from the probe.
If any channel fails the bump test,
•
The instrument will beep and a calibration is immediately and
automatically started. Continue to apply the calibration gas. CAL on
the bottom left of the screen will alternate with APPLY.
The calibration time will begin to countdown in seconds in the lower
right of the screen. The calibration time counted down during a
calibration initiated because of a failed bump test is the difference
between the bump test gas time and the calibration time defined in
the BUMP--SET menu item in Maintenance Mode.
MAINTENANCE
CH4
O2
CO
H2 S
CAL
•
1
20.9
37
10.0
60
%LEL
%
ppm
ppm
At the end of the calibration, the instrument displays the results from
both the bump test and the calibration. Use the AIRS or (SHIFT)T
button to scroll between the calibration/bump test results, the bump
test gas readings, and the calibration gas readings.
MAINTENANCE
FP
O2
PP
CO
FF
H2 S
PP
BUMP/CAL
CH4
GX-2012 Operator’s Manual, CSA Version
%LEL
%
ppm
ppm
Using Maintenance Mode • 115
MAINTENANCE
1
O2
12.0
CO
5
H2 S
23.0
BUMP/
CH4
%LEL
%
ppm
ppm
MAINTENANCE
CH4
O2
CO
H2 S
•
49
12.0
5
25.0
/CAL
%LEL
%
ppm
ppm
To return to the main menu, press POWER ENTER at any time. If
any channel failed the calibration, the buzzer will sound a double
pulsing tone until you press and release the POWER ENTER button.
MAINTENANCE
BUMP
•
Disconnect the tubing from the probe.
13. Unscrew the demand flow regulator from the calibration cylinder.
14. With the BUMP menu option displayed, press the (SHIFT)T button until
the NORMAL menu option is displayed.
15. Press and release the POWER ENTER button to return to Measuring
Mode.
Turning the Lunch Break Setting On or Off
With LNCH BRK set to OFF (factory setting), the GX-2012 automatically
starts new TWA and PEAK reading collection and resets the time in
operation at startup.
With LNCH BRK set to ON, the Resume Measurements Screen displays
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GX-2012 Operator’s Manual, CSA Version
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-2012 was used or start collecting new readings and reset the time in
operation.
1. Use the AIRS or (SHIFT)T buttons to display the LNCH BRK menu
item.
MAINTENANCE
LNCH BRK
2. Press and release the POWER ENTER button. The screen will indicate
the current setting.
MAINTENANCE
OFF
LNCH BRK
3. Use the AIRS or (SHIFT)T button to display the desired setting.
4. Press and release the POWER ENTER button to save the setting and
return to the main menu.
Updating the Alarm Latching Setting
With LATCHING set to ON (factory setting), the GX-2012 remains in alarm
condition until the alarm condition passes and the POWER ENTER button is
pressed.
With LATCHING set to OFF, the GX-2012 automatically resets an alarm
when the alarm condition passes.
GX-2012 Operator’s Manual, CSA Version
Using Maintenance Mode • 117
1. Use the AIRS or (SHIFT)T buttons to display the LATCHING menu
item.
MAINTENANCE
LATCHING
2. Press and release the POWER ENTER button. The screen will indicate
the current setting.
MAINTENANCE
On
LATCHING
3. Use the AIRS or (SHIFT)T button to display the desired setting.
4. Press and release the POWER ENTER button to save the setting and
return to the main menu.
Updating the Alarm Silence Setting
With ALM SLNC set to ON (factory setting), pressing and releasing the
RESET SILENCE button silences the buzzer when the GX-2012 is in alarm.
The LEDs continue to flash and the display continues to show the alarm. If
the alarms are set up as latching, when the gas concentration falls below the
alarm level, pressing and releasing the RESET SILENCE button clears all
alarm indications for that alarm. If an alarm condition occurs, you may still
enter Display Mode by pressing the DISPLAY (ADJ) button. The buzzer will
be silenced but the LEDs will continue to flash and the unit will continue to
vibrate. If you return to Measuring Mode and there is still an alarm condition,
the LEDs will continue to flash, the unit will continue to vibrate, and the
buzzer will remain off. Once the condition clears, press the RESET
SILENCE button to clear the alarm indications.
With ALM SLNC set to OFF, you cannot silence the buzzer. If an alarm
condition occurs, and you enter Display Mode, the buzzer will not be
silenced and the LEDs will continue to flash. Upon return to Measuring
Mode, if there is still an alarm condition and the alarms are set up as latching,
you must wait until it clears before you can press the RESET SILENCE
118 • Using Maintenance Mode
GX-2012 Operator’s Manual, CSA Version
button to clear the alarm indications.
1. Use the AIRS or (SHIFT)T buttons to display the ALM SLNC menu
item.
MAINTENANCE
ALM SLNC
2. Press and release the POWER ENTER button. The screen will indicate
the current setting.
MAINTENANCE
On
ALM SLNC
3. Use the AIRS or (SHIFT)T button to display the desired setting.
4. Press and release the POWER ENTER button to save the setting and
return to the main menu.
Updating the Data Log Interval Setting
This setting indicates how often the GX-2012 saves readings to the data
logger. The following interval times can be selected: 6 minutes, 5 minutes, 3
minutes, 1 minute, 30 seconds, 20 seconds, or 10 seconds. The factory setting
is 5 minutes (300 seconds).
1. Use the AIRS or (SHIFT)T buttons to display the LG INTVL menu
item.
MAINTENANCE
LG INTVL
GX-2012 Operator’s Manual, CSA Version
Using Maintenance Mode • 119
2. Press and release the POWER ENTER button. The screen will indicate
the current setting.
MAINTENANCE
300
LG INTVL
3. Use the AIRS or (SHIFT)T button to display the desired setting.
4. Press and release the POWER ENTER button to save the setting and
return to the main menu.
Updating the Alarm Point Settings
The ALARM--P menu item allows you to update one or more warning,
alarm, STEL, and TWA (for CO and H2S) settings (the reading at which the
GX-2012 recognizes these conditions).
Table 7: Factory Set Alarm Points
Channel
Warning
Alarm
STEL
TWA
Combustible Gas
10% LEL
50% LEL
N/A
N/A
Oxygen
19.5% decreasing
23.5% increasing
N/A
N/A
CO
25 ppm
50 ppm
200 ppm
25 ppm
H2S
5 ppm
30 ppm
5 ppm
1 ppm
For the combustible gas channel, it is not possible to adjust either the
Warning or Alarm settings to be higher than 60 %LEL. In addition, the
Warning setting cannot be adjusted higher than the Alarm setting for all
channels.
NOTE: It is not necessary to adjust every setting for every channel when
you enter this menu item. All settings are shown here for example.
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GX-2012 Operator’s Manual, CSA Version
1. Use the AIRS or (SHIFT)T buttons to display the ALARM--P menu
item. Press and release the POWER ENTER button.
MAINTENANCE
CH4
---
%LEL
ALARM--P
2. You may then select a channel. Use the AIRS or (SHIFT)T buttons to
select a channel. The combustible gas channel is shown for example.
3. Press the POWER ENTER button to display the warning setting for the
combustible channel. It will be flashing.
MAINTENANCE
CH4
10
%LEL
WARNING
4. Use the AIRS or (SHIFT)T buttons to change the warning setting.
5. Press POWER ENTER to save the setting. The alarm setting for the
combustible gas channel will then be displayed.
MAINTENANCE
CH4
50
%LEL
ALARM
6. Use the AIRS or (SHIFT)T buttons to change the alarm setting.
GX-2012 Operator’s Manual, CSA Version
Using Maintenance Mode • 121
7. Press POWER ENTER to save the setting. The unit will direct you back
to the Alarm Points Screen where you can use the AIRS or (SHIFT)T
buttons to select the oxygen channel.
MAINTENANCE
O2
---
%
ALARM--P
Press POWER ENTER.
8. The first selection for the oxygen channel is the alarm pattern.
MAINTENANCE
O2
L-H
ALM PTN
The choices are L-H, L-LL, or H-HH. The L-H pattern provides a
decreasing warning and an increasing alarm. The L-LL pattern provides a
decreasing warning and a decreasing alarm. The H-HH pattern provides
an increasing warning and an increasing alarm. This setting is for
operation in inert atmospheres and will cause INERT to appear along the
bottom line of the display during Normal Operation. Make your selection
using the AIRS or (SHIFT)T buttons and press POWER ENTER when
finished. The factory setting is L-H.
9. You may then adjust the warning setting and alarm setting for the oxygen
channel using the AIRS or (SHIFT)T buttons. Press POWER ENTER
when finished with each selection to return to the Alarm Points Screen.
10. Use the AIRS or (SHIFT)T buttons to select the CO channel and press
POWER ENTER to display the warning setting.
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GX-2012 Operator’s Manual, CSA Version
11. Adjust the values for the warning and alarm settings using the procedure
in step 4 through step 7. When you press POWER ENTER after selecting
the alarm value, you will then be prompted to select the STEL value.
MAINTENANCE
CO
200
ppm
STEL
12. Use the AIRS or (SHIFT)T buttons to change the setting and press
POWER ENTER when finished to save the setting. You will then be
asked to enter a TWA value.
MAINTENANCE
CO
25
ppm
TWA
13. Use the AIRS or (SHIFT)T buttons to change the setting and press
POWER ENTER when finished to save the setting and return to the
Alarm Points Screen.
MAINTENANCE
CO
---
ppm
ALARM--P
GX-2012 Operator’s Manual, CSA Version
Using Maintenance Mode • 123
14. Use the AIRS or (SHIFT)T buttons to select the H2S channel and press
POWER ENTER. Adjust the values for the warning and alarm settings
using the procedure in step 4 through step 7. When you press POWER
ENTER after selecting the alarm value, you will then be prompted to
select the STEL value as you were with the CO channel.
MAINTENANCE
H2S
5.0
ppm
STEL
15. Use the AIRS or (SHIFT)T buttons to change the setting and press
POWER ENTER when finished. You will then be asked to enter a TWA
value.
MAINTENANCE
H2S
1.0
ppm
TWA
16. Use the AIRS or (SHIFT)T buttons to change the setting and press
POWER ENTER when finished to return to the Alarm Points Screen.
MAINTENANCE
--ALARM--P
H2S
ppm
17. When you are finished making adjustments, use the AIRS or (SHIFT)T
buttons to select ESCAPE and press POWER ENTER. You will be
returned to the ALARM--P screen in the main menu.
Turning the Clear Data Logger Screen On or Off
The DLOG DSP menu item allows you to turn the Clear Data Logger Screen
on or off. When set to ON (factory setting), the Clear Data Logger Screen
appears in Display Mode and allows the user to clear any logged data. When
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GX-2012 Operator’s Manual, CSA Version
set to OFF, the Clear Data Logger Screen does not appear in Display Mode
and any logged data cannot be cleared from Display Mode.
1. Use the AIRS or (SHIFT)T buttons to display the DLOG DSP menu
item.
MAINTENANCE
DLOG DSP
2. Press and release the POWER ENTER button. The screen will indicate
the current setting.
MAINTENANCE
On
DLOG DSP
3. Use the AIRS or (SHIFT)T button to display the desired setting.
4. Press and release the POWER ENTER button to save the setting and
return to the main menu.
Turning the Bump Test Function On or Off
The BUMP DSP menu item is used to turn the bump test function on or off.
If set to OFF, the BUMP menu item in Calibration Mode and Maintenance
Mode does not appear. In addition, the BUMP--SET, BP INTVL, BP
RMNDR, and BP EXPRD menu items will not display in Maintenance
Mode. The factory setting is OFF.
1. Use the AIRS or (SHIFT)T buttons to display the BUMP DSP menu
item.
MAINTENANCE
BUMP DSP
GX-2012 Operator’s Manual, CSA Version
Using Maintenance Mode • 125
2. Press and release the POWER ENTER button. The screen will indicate
the current setting.
MAINTENANCE
On
BUMP DSP
3. Use the AIRS or (SHIFT)T button to display the desired setting.
4. Press and release the POWER ENTER button to save the setting and
return to the main menu.
Turning the Pump Off Screen On or Off
The POFF DSP menu item is used to turn the Pump Off Screen on or off.
When set to ON, the Pump Off Screen appears in Display Mode and the user
can turn off the pump in order to conserve battery power. If set to OFF
(factory setting), the Pump Off Screen does not appear in Display Mode and
the user cannot turn the pump off.
WARNING: The GX-2012 is not a gas monitoring device if the pump is
turned off.
1. Use the AIRS or (SHIFT)T buttons to display the POFF DSP menu
item.
MAINTENANCE
POFF DSP
126 • Using Maintenance Mode
GX-2012 Operator’s Manual, CSA Version
2. Press and release the POWER ENTER button. The screen will indicate
the current setting.
MAINTENANCE
OFF
POFF DSP
3. Use the AIRS or (SHIFT)T button to display the desired setting.
4. Press and release the POWER ENTER button to save the setting and
return to the main menu.
Updating the Bump Test Parameters
The BUMP--SET menu item is used to adjust the bump test parameters.
NOTE: If the BUMP DSP menu item is set to OFF, this menu item does not
appear.
1. Use the AIRS or (SHIFT)T buttons to display the BUMP. SET menu
item.
MAINTENANCE
BUMP--SET
2. Press and release the POWER ENTER button. The values displayed are
for GAS TIME, CHECK (bump test tolerance), CAL TIME, and AUTO
CAL. The cursor on the left of the screen shows which setting is
associated with the parameter shown at the bottom of the screen. Use the
AIRS or (SHIFT)T buttons to scroll up or down along the list.
MAINTENANCE
30
30
90
On
GAS TIME
GX-2012 Operator’s Manual, CSA Version
Using Maintenance Mode • 127
3. To update the GAS TIME setting, with the cursor next to the gas time and
with GAS TIME displayed along the bottom of the screen, press POWER
ENTER. The factory setting is 30 seconds. The value will begin to flash.
Use the AIRS or (SHIFT)T buttons to select a new gas time. The GAS
TIME is the amount of time that the instrument is exposed to gas during a
bump test. The time increments are 30, 45, 60, and 90 seconds. Once a
value is selected, press and release the POWER ENTER button to save it.
The value will stop blinking.
4. To update the bump test tolerance, use the (SHIFT)T button to scroll to
the CHECK value. The factory setting is 30%. This is the bump test
tolerance value and is represented as a percentage. 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. With the
cursor next to the check value and CHECK displayed along the bottom of
the screen, press and release POWER ENTER. The value will begin to
flash. Use the AIRS or (SHIFT)T buttons to select a new threshold
value. The available values are 10, 20, 30, 40, and 50. Once a value is
selected, press and release the POWER ENTER button to save it. The
value will stop blinking.
5. To update the CAL TIME setting, use the (SHIFT)T button to scroll to
the CAL TIME value. The factory setting is 90 seconds. This is the length
of time the instrument will remain exposed to calibration gas after a
failed bump test 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-2012 will only be exposed to gas for an additional 60
seconds. With the cursor next to the cal time value and CAL TIME
displayed along the bottom of the screen, press and release the POWER
ENTER button. The value will begin to flash. Use the AIRS or
(SHIFT)T buttons to select a new cal time value. The choices are 90 and
120 seconds. Once a value is selected, press and release the POWER
ENTER button to save it. The value will stop blinking.
6. To update the AUTO CAL setting, use the (SHIFT)T button to scroll to
the AUTO CAL value. The factory setting is ON. With AUTO CAL set
to ON, if a bump test fails, the unit will automatically begin a calibration.
If AUTO CAL is set to OFF and a bump test fails, nothing will happen.
With the cursor next to the auto cal selection and AUTO CAL displayed
along the bottom of the screen, press and release the POWER ENTER
button. The value will begin to flash. Use the AIRS or (SHIFT)T
buttons to select ON or OFF. Once a selection is made, press and release
the POWER ENTER button to save it. The value will stop blinking.
128 • Using Maintenance Mode
GX-2012 Operator’s Manual, CSA Version
7. To exit the BUMP--SET menu, use the (SHIFT)T button to scroll to
ESCAPE and press and release the POWER ENTER button.
Updating the Confirmation Beep Setting
With BEEP. SET set to ON, the GX-2012 beeps once every 5 minutes to
verify that it is operating.
With BEEP. SET set to OFF (factory setting), the GX-2012 does not sound a
confirmation beep.
1. Use the AIRS or (SHIFT)T buttons to display the BEEP. SET menu
item. Press and release the POWER ENTER button. The screen will
indicate the current setting.
MAINTENANCE
On
BEEP. SET
2. Use the AIRS or (SHIFT)T button to display the desired setting.
3. Press and release the POWER ENTER button to save the setting and
return to the main menu.
Updating the Datalog Overwrite Setting
With OVER WRT set to ON (factory setting), the GX-2012 writes over the
oldest data with new data when the data logger memory is full.
With OVER WRT set to OFF, the GX-2012 stops saving data to the data
logger when the data logger memory is full.
1. Use the AIRS or (SHIFT)T buttons to display the OVER WRT menu
item. Press and release the POWER ENTER button. The screen will
indicate the current setting.
MAINTENANCE
On
OVER WRT
2. Use the AIRS or (SHIFT)T button to display the desired setting.
GX-2012 Operator’s Manual, CSA Version
Using Maintenance Mode • 129
3. Press and release the POWER ENTER button to save the setting and
return to the main menu.
Updating the Calibration Interval
This CL INTVL setting defines the amount of time between calibrations.
The minimum setting is 1 day and the maximum setting is 365 days. The
factory setting is 90 days.
1. Use the AIRS or (SHIFT)T buttons to display the CL INTVL menu
item. Press and release the POWER ENTER button. The screen will
indicate the current setting.
MAINTENANCE
90
CL INTVL
2. Use the AIRS or (SHIFT)T button to display the desired setting.
Tip: Press and hold the AIRS or (SHIFT)T button to rapidly scroll
through the settings.
3. Press and release the POWER ENTER button to save the setting and
return to the main menu.
Updating the Calibration Reminder Setting
With CL RMNDR set to ON (factory setting), the GX-2012 will give an
indication at start up if it is due for calibration. The type of indication will
depend on the CL EXPRD setting (see below).
1. Use the AIRS or (SHIFT)T buttons to display the CL RMNDR menu
item. Press and release the POWER ENTER button. The screen will
indicate the current setting.
MAINTENANCE
On
CL RMNDR
2. Use the AIRS or (SHIFT)T button to display the desired setting.
130 • Using Maintenance Mode
GX-2012 Operator’s Manual, CSA Version
3. Press and release the POWER ENTER button to save the setting and
return to the main menu.
Updating the Calibration Expired Action Setting
This item defines what indication is given during start up when calibration is
due and CL RMNDR is set to ON.
With CL EXPRD set to CONFIRM (factory setting), the GX-2012 will give
an indication at start up if calibration is due and require the user to press the
RESET SILENCE button to continue.
With CL EXPRD set to NOT USE, if the unit is due for calibration the GX2012 will give an indication at start up that calibration is due and the unit
cannot be used until it is calibrated. With this setting, it is necessary to
calibrate the instrument from Maintenance Mode if calibration is not
performed before it is due. See “Calibrating Using Auto Calibration” on
page 105 and “Calibrating Using Single Calibration” on page 108 for
instructions.
With CL EXPRD set to NO EFFECT, no confirmation during startup or
calibration is required to use the GX-2012.
1. Use the AIRS or (SHIFT)T buttons to display the CL EXPRD menu
item. Press and release the POWER ENTER button. The screen will
indicate the current setting.
MAINTENANCE
CAL
SEL
CONFIRM
2. Use the AIRS or (SHIFT)T button to display the desired setting along
the bottom of the screen.
3. Press and release the POWER ENTER button to save the setting and
return to the main menu.
Updating the Calibration Check Setting
This item setting defines which sensors are used to update the calibration
reminder screen. C--CHECK can be set to 4-GAS or ALL. If C--CHECK is
set to 4-GAS (factory setting), the calibration dates for only the standard 4
sensors (LEL, O2, H2S, and CO) are used to determine if calibration is due. If
C--CHECK is set to ALL, the calibration dates for the standard 4 sensors
along with the %volume sensor are used to determine if a calibration is due.
GX-2012 Operator’s Manual, CSA Version
Using Maintenance Mode • 131
1. Use the AIRS or (SHIFT)T buttons to display the C--CHECK menu
item. Press and release the POWER ENTER button. The screen will
indicate the current setting.
MAINTENANCE
4GAS
C--CHECK
2. Use the AIRS or (SHIFT)T button to display the desired setting.
3. Press and release the POWER ENTER button to save the setting and
return to the main menu.
Updating the Bump Test Interval
This BP INTVL setting defines the amount of time between bump tests. The
minimum setting is 0 days and the maximum setting is 30 days. The factory
setting is 30 days.
NOTE: If the BUMP DSP menu item is set to OFF, this menu item does not
appear.
1. Use the AIRS or (SHIFT)T buttons to display the BP INTVL menu
item. Press and release the POWER ENTER button. The screen indicates
the current setting.
MAINTENANCE
30
BP INTVL
2. Use the AIRS or (SHIFT)T button to display the desired setting.
Tip: Press and hold the AIRS or (SHIFT)T button to rapidly scroll
through the settings.
3. Press and release the POWER ENTER button to save the setting and
return to the main menu.
132 • Using Maintenance Mode
GX-2012 Operator’s Manual, CSA Version
Updating the Bump Test Reminder Setting
With BP RMNDR set to ON, the GX-2012 will give an indication at start up
if it is due for bump testing. The type of indication will depend on the BP
EXPRD setting (see below).
With BP RMNDR set to OFF (factory setting), the GX-2012 will give no
indication at start up if it is due for bump testing.
NOTE: If the BUMP DSP menu item is set to OFF, this menu item does not
appear.
1. Use the AIRS or (SHIFT)T buttons to display the BP RMNDR menu
item. Press and release the POWER ENTER button. The screen will
indicate the current setting.
MAINTENANCE
On
BP RMNDR
2. Use the AIRS or (SHIFT)T button to display the desired setting.
3. Press and release the POWER ENTER button to save the setting and
return to the main menu.
Updating the Bump Test Expired Action Setting
This item defines what indication is given during start up when a bump test is
due and BP RMNDR is set to ON.
With BP EXPRD set to CONFIRM (factory setting), the GX-2012 will give
an indication at start up if a bump test is due and require the user to press the
RESET SILENCE button to continue.
With BP EXPRD set to NOT USE, if the unit is due for a bump test the GX2012 will give an indication at start up that the bump test is due and the unit
cannot be used until it is bump tested. With this setting, it is necessary to
bump test the instrument from the Maintenance Mode if a bump test is not
performed before it is due. See “Performing a Bump Test” on page 111 for
instructions.
With BP EXPRD set to NO EFFECT, no confirmation during startup or
bump test is required to use the GX-2012.
GX-2012 Operator’s Manual, CSA Version
Using Maintenance Mode • 133
NOTE: If the BUMP DSP menu item is set to OFF, this menu item does not
appear.
1. Use the AIRS or (SHIFT)T buttons to display the BP EXPRD menu
item. Press and release the POWER ENTER button. The screen will
indicate the current setting.
MAINTENANCE
tESt
SEL
CONFIRM
2. Use the AIRS or (SHIFT)T button to display the desired setting along
the bottom of the screen.
3. Press and release the POWER ENTER button to save the setting and
return to the main menu.
Updating the Bump Test Check Setting
This item setting defines which sensors are used to update the bump test
reminder screen. B--CHECK can be set to 4-GAS or ALL. If B--CHECK is
set to 4-GAS (factory setting), the calibration dates for only the standard 4
sensors (LEL, O2, H2S, and CO) are used to determine if a bump test is due.
If B--CHECK is set to ALL, the calibration dates for the standard 4 sensors
along with the %volume sensor are used to determine if a bump test is due.
1. Use the AIRS or (SHIFT)T buttons to display the B--CHECK menu
item. Press and release the POWER ENTER button. The screen will
indicate the current setting.
MAINTENANCE
4GAS
B--CHECK
2. Use the AIRS or (SHIFT)T button to display the desired setting.
3. Press and release the POWER ENTER button to save the setting and
return to the main menu.
134 • Using Maintenance Mode
GX-2012 Operator’s Manual, CSA Version
Turning the ID Display Function On or Off
With ID DISP set to ON, the User ID Screen and Station ID Screens display
during start up.
With ID DISP set to OFF (factory setting), the User ID Screen and Station
ID Screens do not display during start up.
The User ID Screen and Station ID Screen always appear in Display Mode,
regardless of the ID DISP setting.
1. Use the AIRS or (SHIFT)T buttons to display the ID DISP menu item.
Press and release the POWER ENTER button. The screen will indicate
the current setting.
MAINTENANCE
On
ID DISP
2. Use the AIRS or (SHIFT)T button to display the desired setting.
3. Press and release the POWER ENTER button to save the setting and
return to the main menu.
Updating the LCD Back Light Time Setting
The BCK LGHT setting indicates the length of time the LCD illuminates
when you press any button. The minimum setting is 0 seconds; the maximum
setting is 255 seconds. The factory setting is 30 seconds.
NOTE: The backlight stays on during the entire warmup sequence.
1. Use the AIRS or (SHIFT)T buttons to display the BCK LGHT menu
item. Press and release the POWER ENTER button. The screen will
indicate the current setting.
MAINTENANCE
30
BCK LGHT
2. Use the AIRS and (SHIFT)T buttons to display the desired setting.
GX-2012 Operator’s Manual, CSA Version
Using Maintenance Mode • 135
3. Press and release the POWER ENTER button to save the setting and
return to the main menu.
Updating the Autozero Function
With AUTO.ZERO turned ON, the GX-2012 will automatically perform a
fresh air adjust when it is turned on. With the AUTO.ZERO function turned
OFF (factory setting), this does not occur.
WARNING: If you turn on the autozero function, you must ensure that
the unit is in a fresh air environment when it is turned on.
1. Use the AIRS or (SHIFT)T buttons to display the AUTO.ZERO menu
item. Press and release the POWER ENTER button. The screen will
indicate the current setting.
MAINTENANCE
OFF
AUTO.ZERO
2. Use the AIRS or (SHIFT)T button to display the desired setting.
3. Press and release the POWER ENTER button to save the setting and
return to the main menu.
Updating the Demand Zero Function
The DEMAND Z function allows you to manually perform a fresh air adjust
in normal operation by pressing the AIRS button. The factory setting is ON.
1. Use the AIRS or (SHIFT)T buttons to display the DEMAND Z menu
item. Press and release the POWER ENTER button. The screen will
indicate the current setting.
MAINTENANCE
On
DEMAND Z
2. Use the AIRS or (SHIFT)T button to display the desired setting.
3. Press and release the POWER ENTER button to save the setting and
136 • Using Maintenance Mode
GX-2012 Operator’s Manual, CSA Version
return to the main menu.
Updating the Leak Check/Bar Hole Mode Setting
With L./B. MODE turned OFF (factory setting), the GX-2012 will
automatically enter Normal Mode when it is turned on.
With L./B. MODE set to bH, you will be prompted to choose between
Normal Mode and Bar Hole Mode when the GX-2012 is turned on.
With L./B. MODE set to LC, you will be prompted to choose between
Normal Mode and Leak Check Mode when the GX-2012 is turned on.
With L./B. MODE set to LC bH, you will be prompted to choose
between Normal Mode, Bar Hole Mode, and Leak Check Mode when
the GX-2012 is turned on.
1. Use the AIRS or (SHIFT)T buttons to display the L./B. MODE menu
item.
MAINTENANCE
L./B. MODE
2. Press and release the POWER ENTER button. The screen will indicate
the current setting.
MAINTENANCE
OFF
L./B. MODE
3. Use the AIRS or (SHIFT)T button to display the desired setting.
4. Press and release the POWER ENTER button to save the setting and
return to the main menu.
GX-2012 Operator’s Manual, CSA Version
Using Maintenance Mode • 137
Updating the Bar Hole Sampling Time
The Bar Hole Sampling Time is the amount of time that the GX-2012
samples a bar hole when being used in Bar Hole Mode. The 3 selections are
30, 45, and 60 seconds. The factory setting is 30 seconds.
1. Use the AIRS or (SHIFT)T buttons to display the B.H. TIME menu
item.
MAINTENANCE
B.H. TIME
2. Press and release the POWER ENTER button. The screen will indicate
the current setting.
MAINTENANCE
30
B.H. TIME
3. Use the AIRS or (SHIFT)T button to display the desired setting.
4. Press and release the POWER ENTER button to save the setting and
return to the main menu.
Turning Portuguese On or Off
With PORTUGAL set to On, the GX-2012’s displayed language will
be Portuguese.
With PORTUGAL set to OFF (factory setting), the GX-2012’s
displayed language will be English.
138 • Using Maintenance Mode
GX-2012 Operator’s Manual, CSA Version
1. Use the AIRS or (SHIFT)T buttons to display the PORTUGAL
menu item.
MAINTENANCE
PORTUGAL
2. Press and release the POWER ENTER button. The screen will
indicate the current setting.
MAINTENANCE
OFF
PORTUGAL
3. Use the AIRS or (SHIFT)T button to display the desired setting.
4. Press and release the POWER ENTER button to save the setting
and return to the main menu.
Updating the Leak Check Mode CO
Channel Display Setting
With CO DISP set to OFF (factory setting), the CO channel is not
displayed in Leak Check Mode but is still displayed in Normal Mode.
With CO DISP set to On, the CO channel will be displayed in Leak
Check Mode but there will be no CO alarms and the CO channel
reading will not be saved to any snap log data taken during the
operating session.
GX-2012 Operator’s Manual, CSA Version
Using Maintenance Mode • 139
1. Use the AIRS or (SHIFT)T buttons to display the CO DISP menu
item.
MAINTENANCE
CO DISP
2. Press and release the POWER ENTER button. The screen will
indicate the current setting.
MAINTENANCE
OFF
CO DISP
3. Use the AIRS or (SHIFT)T button to display the desired setting.
4. Press and release the POWER ENTER button to save the setting
and return to the main menu.
ROM/SUM
The ROM/SUM screen shows the firmware version that is loaded in the
instrument and the firmware checksum.
1. Use the AIRS button to scroll to the ROM/SUM screen. Press POWER
ENTER and the ROM and SUM values for your unit will be displayed.
MAINTENANCE
5
1513
7864
ROM/SUM
The first two lines display the ROM number. The ROM number indicates
the firmware version number. In the above example, the ROM number is
51513. The bottom line displays the SUM number, 7864 in the above
example.
140 • Using Maintenance Mode
GX-2012 Operator’s Manual, CSA Version
2. Press POWER ENTER again to return to the ROM/SUM menu screen.
Turning the Password Function On or Off
With PASSWORD set to ON, the GX-2012 prompts you for a password
when you enter Calibration Mode.
With PASSWORD set to OFF (factory setting), no password is required to
enter Calibration Mode.
NOTE: A password is always required to enter Maintenance Mode even if
PASSWORD is turned OFF. You may change the factory set
password by turning PASSWORD ON and entering a new
password when prompted for it.
1. Use the AIRS or (SHIFT)T buttons to display the PASSWORD menu
item. Press and release the POWER ENTER button. The screen indicates
the current setting.
MAINTENANCE
On
PASSWORD
2. Use the AIRS or (SHIFT)T button to display the desired setting.
3. If you selected OFF, press and release the POWER ENTER button to
save the setting and return to the main menu.
If you selected ON, press and release the POWER ENTER button. ON is
replaced by the four characters making up the current password.
MAINTENANCE
2102
PASSWORD
4. Use the AIRS or (SHIFT)T button to select a number from 0 to 9.
5. Press and release the POWER ENTER button to enter the selection and
advance to the next character.
6. Repeat steps 4 and 5 to select the remaining characters. When you press
GX-2012 Operator’s Manual, CSA Version
Using Maintenance Mode • 141
and release the POWER ENTER button to enter the last number, the
password is saved and you return to the main menu.
Performing a Low Flow Setpoint Adjustment
If your instrument repeatedly goes into low flow alarm and you have tried all
of the recommendations in the Troubleshooting section, you may need to
perform a low flow setpoint adjustment.
1. Use the AIRS or (SHIFT)T buttons to display the FLOW ADJ menu
item. Press and release the POWER ENTER button. The pump will turn
off and the screen will display values that reflect the pump’s current draw.
MAINTENANCE
45
%
1496
FLOW ADJ
2. Use the AIRS or (SHIFT)T buttons to get a reading of approximately
1500 on the bottom value. When you have adjusted the value as close as
you can, press and release the POWER ENTER button.
3. The pump will turn on and two new values will be displayed. The top will
be a reference value and the bottom will reflect the pump’s current draw.
MAINTENANCE
1500
1760
FLOW ADJ
Connect a flow meter to the inlet of the instrument and adjust it to 0.5
SCFH ± 0.1 SCFH. This will be the low flow setpoint. You do not need to
adjust anything at the instrument. Once the low flow setpoint is set, press
and release the POWER ENTER button.
4. You will return to the FLOW ADJ menu item in Maintenance Mode.
Exiting Maintenance Mode
1. Use the AIRS or (SHIFT)T buttons to display the START menu item.
Press and release the POWER ENTER button.
2. The unit will exit Maintenance Mode and begin its start up sequence.
142 • Using Maintenance Mode
GX-2012 Operator’s Manual, CSA Version
Chapter 7: GX-2012 Maintenance
Overview
This chapter describes troubleshooting procedures for the GX-2012. It also
includes procedures recharging the Li-ion battery pack (rechargeable
version), replacing the alkaline batteries (alkaline version), 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-2012.
Table 8: Troubleshooting the GX-2012
Symptoms
• The LCD is blank.
Probable
Causes
• The unit may
have been turned
off.
• The alkaline
batteries may
need to be
replaced or the
lithium ion
battery pack
recharged.
GX-2012 Operator’s Manual, CSA Version
Recommended Action
1. To turn on the unit, press and
briefly hold the POWER
ENTER button.
2. If the unit does not turn on,
replace the alkaline batteries
or recharge the lithium ion
battery pack.
3. If the difficulties continue,
contact RKI Instruments, Inc.
for further instruction.
Overview • 143
Table 8: Troubleshooting the GX-2012
Symptoms
Probable
Causes
Recommended Action
• Display indicates
“FAIL SYSTEM”
during startup
along with an error
code.
• A circuit fault has
occurred on one
of the PCB’s.
1. If the error code is 031,
indicating a FLASH memory
failure, press and release the
RESET SILENCE button to
continue to measuring mode
keeping in mind that there will
be no datalogging function.
2. If the error code is anything
else, the instrument cannot be
used.
3. Contact RKI Instruments, Inc.
for further instruction if either
1 or 2 occur.
• Display indicates
“FAIL CLOCK”
during startup.
• An internal clock
failure has
occurred
because the date
in the unit’s
memory is not a
valid date.
1. Enter normal operation by
pressing and releasing the
RESET SILENCE button to
use the unit temporarily.
2. Attempt to set the date in the
DATE menu item in
Maintenance Mode.
3. If you cannot set the date,
contact RKI Instruments, Inc.
for further instruction.
• 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.
• The LCD shows
abnormally high or
low readings but
other gas
detection
instruments do
not.
• The LEL or CO
filters may need
to be replaced
• The GX-2012
may need to be
recalibrated.
• The sensor for
the affected
channel(s) may
need
replacement.
1. If the abnormal reading is on
the LEL channel, replace the
LEL filter. If the abnormal
reading is on the CO channel,
replace the charcoal 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. If the difficulties continue,
contact RKI Instruments for
further instruction.
144 • Troubleshooting
GX-2012 Operator’s Manual, CSA Version
Table 8: Troubleshooting the GX-2012
Probable
Causes
Recommended Action
• The unit indicates
flow failure and
does not recover
when RESET
SILENCE is
pressed and
released.
• The cotton filter
in the probe or
filter holder is
dirty and
clogged.
• The sample hose
has a kink or
obstruction.
• The hydrophobic
filter disks or wire
mesh disk are
dirty and
clogged.
• The pump is
malfunctioning.
1. Change the cotton filter in the
probe or filter holder.
2. Inspect the sample hose for
kinks or obstructions and
replace if necessary.
3. Inspect the hydrophobic filter
disks and the wire mesh disk
and replace if necessary.
4. Perform a low flow setpoint
adjustment. For instructions,
see “Performing a Low Flow
Setpoint Adjustment” on
page 142.
5. If difficulties continue, contact
RKI Instruments for further
instruction.
• Auto calibration
fails or unable to
set the response
readings during
single calibration.
• The auto
calibration values
may not match
the cylinder gas
concentrations
(auto calibration
only).
• The CO filter is
saturated.
• The sample gas
is not reaching
the sensor
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.
1. Check all calibration tubing for
leaks or for any bad
connections.
2. Make sure the GX-2012 has
been properly set up for
calibration.
3. Change the CO filter.
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.
Symptoms
GX-2012 Operator’s Manual, CSA Version
Troubleshooting • 145
Replacing or Recharging the
Batteries
WARNING: To prevent ignition of a hazardous atmosphere, batteries
must only be changed or charged in an area known to be
nonhazardous.
AVERTISSEMENT:Pour éviter l’inflammation d’une atmosphère
dangereuse, les batteries doivent uniquement être modifiés
ou facturés dans une zone connue comme non dangereuse.
Replace 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 is displayed in the battery icon on the LCD, and it will be
flashing.
Replacing Alkaline Batteries
NOTE: Use Procell PC 1500 alkaline batteries, Duracell MN 1500 alkaline
batteries, or RKI Instruments lithium ion battery pack 49-1615RK
to maintain the CSA classification of the GX-2012. Use of other
batteries will void the CSA classification and may void the
warranty. Do not mix old/new or different types of batteries.
NOTE: Utiliser Procell 1500 piles alcalines, Duracell MN 1500 piles
alcalines, ou RKI Instruments pack batterie lithium-ion 49-1615RK
de maintenir la classification CSA de la GX-2012. L’utilisation
d’autres piles annule la classification CSA et peut annuler la
garantie. Ne mélangez pas les anciennes/nouvelles ou différents
types de piles.
1. Turn off the GX-2012.
WARNING: Do not remove the batteries while the GX-2012 is on.
2. Turn the battery cover release knob counterclockwise, remove the battery
cover, and lay it aside.
3. Carefully remove the old alkaline batteries. Verify that the battery
compartment and electrical contacts are clean.
146 • Replacing or Recharging the Batteries
GX-2012 Operator’s Manual, CSA Ver-
OPEN
CLOSE
4. Carefully install the new AA alkaline batteries according to the battery
diagram inside the battery compartment.
Figure 17: Installing the Alkaline Batteries
5. Reinstall the battery cover and turn the battery cover release knob
clockwise to lock the cover in place.
Replacing the Lithium Ion Battery Pack
NOTE: Use Procell PC 1500 alkaline batteries, Duracell MN 1500 alkaline
batteries, or RKI Instruments lithium ion battery pack 49-1615RK
to maintain the CSA classification of the GX-2012. Use of other
batteries will void the CSA classification and may void the
warranty. Do not mix old/new or different types of batteries.
NOTE: Utiliser Procell 1500 piles alcalines, Duracell MN 1500 piles
alcalines, ou RKI Instruments pack batterie lithium-ion 49-1615RK
de maintenir la classification CSA de la GX-2012. L’utilisation
d’autres piles annule la classification CSA et peut annuler la
garantie. Ne mélangez pas les anciennes/nouvelles ou différents
types de piles.
1. Turn off the GX-2012.
WARNING: Do not remove the battery pack while the GX-2012 is on.
GX-2012 Operator’s Manual, CSA Version
Replacing or Recharging the Batteries • 147
2. Push the latch on the bottom of the GX-2012 toward the front of the
instrument to release the battery pack.
Slide Latch This Way
Figure 18: Releasing the Battery Pack
3. Slide the battery pack away from the instrument.
4. Insert a new battery pack ensuring that the slots and grooves on the sides
are properly lined up. Push the battery pack into the instrument until you
hear a click.
Figure 19: Installing the Battery Pack
148 • Replacing or Recharging the Batteries
GX-2012 Operator’s Manual, CSA Ver-
Recharging the Lithium Ion Battery Pack in the
Instrument
CAUTION: To be used only with lithium ion battery pack p/n 49-1615RK.
Charge only with RKI charger model BC-2012, p/n 49-2180RK,
or RKI charger model BC-2012DC, p/n 49-2181RK. Use of
other rechargeable batteries or chargers or charging of other
rechargeable batteries in the GX-2012 will void the warranty.
PRUDENCE:Pour être utilisé uniquement avec une batterie au lithium-ion
p/n 49-1615RK. Charge uniquement en fonction du modèle de
chargeur RKI BC-2012, p/n 49-2180RK, ou modèle de chargeur
BC-2012DC RKI, p/n 49-2181RK. L’utilisation d’autres piles ou
chargeurs rechargeables ou charger d’autres batteries
recharegables dans le GX-2012 annule la garantie.
1. Make sure the GX-2012 is off.
2. Confirm that the adapter’s DC output cord is plugged into the charger.
3. If using an AC powered charging station, plug the AC adapter into an
electrical outlet.
AC Power Supply
Power Supply Jack
To AC
Outlet
Charge LED
Figure 20: Connecting the Charging Station’s AC Adapter
GX-2012 Operator’s Manual, CSA Version
Replacing or Recharging the Batteries • 149
If using a DC powered charging station, plug the 12 VDC vehicle plug
adapter into a vehicle’s 12 VDC power socket.
Power Supply Jack
DC Adapter
To Vehicle
12 VDC
Power Socket
Charge LED
DC Powered Charging Station
Figure 21: Connecting the Charging Station’s DC Adapter
The construction of the charging stations allows them to be chained
together but a separate adapter must be used for each charging station.
One adapter will not operate more than one charging station.
4. Place the GX-2012 into the battery charging station as shown in Figure
22 below so that the metal contacts on the back of the unit come into
contact with the metal contacts on the back of the holder in the charging
station. When proper contact has been made, the red LED on the charging
station will turn on.
If you are using a DC adapter, the charging station comes with a velcro
strap to secure the GX-2012. Ensure that both ends of the velcro strap are
attached to the charging station and that it is securing the instrument.
150 • Replacing or Recharging the Batteries
GX-2012 Operator’s Manual, CSA Ver-
Red Charging LED
Figure 22: Putting the GX-2012 into the Charging Station
5. When a full charge has been reached, approximately 4 hours, the red
LED on the charging station will turn off. Remove the GX-2012 from the
charging station and unplug the charging station’s power cord from the
AC outlet.
Recharging the Lithium Ion Battery Pack Out of the
Instrument
The lithium ion battery pack may be charged using the charging station while
it is out of the GX-2012. This is useful if spare battery packs are kept in case
the pack in the GX-2012 needs to be charged, but the unit must be used
immediately. In this case, a spare charged pack can be installed in the GX2012 and the dead pack charged in the charging station.
1. Make sure the GX-2012 is off.
2. Confirm that the adapter’s DC output cord is plugged into the charger. If
a multi-instrument charging station is being used, the same AC adapter is
used as for the single instrument charging station.
GX-2012 Operator’s Manual, CSA Version
Replacing or Recharging the Batteries • 151
3. If using an AC powered charging station, plug the AC adapter into an
electrical outlet.
AC Power Supply
Power Supply Jack
To AC
Outlet
Charge LED
AC Powered Charging Station
Figure 23: Connecting the Charging Station’s AC Adapter
152 • Replacing or Recharging the Batteries
GX-2012 Operator’s Manual, CSA Ver-
If using a DC powered charging station, plug the 12 VDC vehicle plug
adapter into a vehicle’s 12 VDC power socket.
Power Supply Jack
DC Adapter
To Vehicle
12 VDC
Power Socket
Charge LED
DC Powered Charging Station
Figure 24: Connecting the Charging Station’s DC Adapter
The construction of the charging stations allows them to be chained
together but a separate adapter must be used for each charging station.
One adapter will not operate more than one charging station.
GX-2012 Operator’s Manual, CSA Version
Replacing or Recharging the Batteries • 153
4. Insert the battery pack into the charging station as shown in Figure 25
below so that the metal contacts on the back of the battery pack come into
contact with the metal contacts in the charging station. When proper
contact has been made, the red LED on the charging station will turn on.
Battery Pack
Figure 25: Putting the Battery Pack into the Charging Station
5. When a full charge has been reached, approximately 4 hours, the red
LED on the charging station will turn off. Remove the battery pack from
the charging station and unplug the charging station’s power cord from
the AC outlet.
Replacing the LEL and CO Filters
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.
1. Verify that the GX-2012 is off.
2. Use a screwdriver to remove the three screws holding the belt clip to the
back side of the instrument. Two of these screws also secure the flow
chamber.
154 • Replacing the LEL and CO Filters
GX-2012 Operator’s Manual, CSA Version
3. Remove the belt clip and unscrew the remaining screw holding in the
flow chamber.
4. Grab the exhaust tube and pull it gently away from the unit to slide the
flow chamber out of the unit. The CO (charcoal) filter may come out.
5. To replace the LEL filter, remove the old one from its recess in the sensor
gasket and replace it with the new one making sure that it is properly
seated. You do not have to remove the sensor gasket to replace the LEL
filter. It sits in a recess on top of it.
6. To replace the CO filter, pull the old one out of its recess in the sensor
gasket if it did not already come out and replace it with a new one. You
do not have to remove the sensor gasket to do this. The CO filter sits in a
recess on top of it.
LEL Filter
Sensor
Gasket
CO Filter
Figure 26: Replacing the LEL and CO Filters
7. Insert the flow chamber back into the instrument.
8. Tighten the top screw of the flow chamber completely.
GX-2012 Operator’s Manual, CSA Version
Replacing the LEL and CO Filters • 155
9. Place the belt clip into position and tighten the three screws retaining it.
Replacing a Sensor
1. Verify that the GX-2012 is off.
2. Use a screwdriver to remove the three screws holding the belt clip to the
back side of the instrument. Two of these screws also secure the flow
chamber.
3. Remove the belt clip and unscrew the remaining screw holding in the
flow chamber.
4. Grab the exhaust tube and pull it gently away from the unit to slide the
flow chamber out of the unit.
5. Gently pull on the knob of the sensor gasket to remove it. Be sure not to
lose any of the filters that are in it. The sensors will be exposed.
6. Remove the sensor from its socket.
7. Carefully insert the replacement sensor in the correct socket.
Sensor
Gasket
Exhaust
Flow
Chamber
HC
VOL
HC
LEL
O2
HC
PPM
Knob
CO
% Volume
Combustible Sensor
PPM
Oxygen
Combustible
Sensor
Sensor
% LEL
Combustible Sensor
CO Sensor
Align Tabs in CO Sensor
with Tabs in Sockets
Figure 27: Replacing a Sensor
156 • Replacing a Sensor
GX-2012 Operator’s Manual, CSA Version
CAUTION: When replacing a sensor, verify that the sensor is properly
aligned with its socket before inserting it into the socket. The CO
and H2S sensors have alignment slots which match up with
alignment tabs in the sockets. The combustible sensors each
have two non-polarized contacts which must line up with the
contacts in their socket. Forcing a sensor into its socket may
damage the sensor or the socket.
8. If your instrument has a factory installed dummy sensor, ensure that it is
still installed correctly. Make sure that the flat side is up and the hollow
side is down.
9. Place the sensor gasket and filters back into the chamber ensuring that it
seals with the sensors and the edge of the chamber.
10. Place the flow chamber in position over the sensor area and press it into
the case until it is flush with the back of the case.
11. Tighten the top screw of the flow chamber completely.
12. Place the belt clip into position and tighten the three screws retaining it.
13. Start up the GX-2012 by pressing and briefly holding the POWER
ENTER button.
14. Calibrate the new sensor as described in “Calibration Mode” on page 57.
Replacing the Hydrophobic Disk Filter,
Cotton Filter, and Wire Mesh Disk
1. Verify that the GX-2012 is off.
2. Locate the clear plastic filter holder at the top of the GX-2012.
3. Grasp the filter holder and turn it 1/4 turn counterclockwise.
4. Pull the filter holder away from the case. Inspect the cotton dust filter and
replace if dirty.
GX-2012 Operator’s Manual, CSA Version
Replacing the Hydrophobic Disk Filter, • 157
5. The hydrophobic disk filters and wire mesh disk are located in the case
and are retained by a rubber gasket. Pull out the rubber gasket with
needle nose pliers.
Rubber Gasket
Hydrophobic Disk Filter
Cotton Dust Filter
Filter Holder
Wire Mesh
Disk
Installation
Stub
Figure 28: Changing the Filters & Wire Mesh Disk
6. Remove the old hydrophobic filters and/or wire mesh disk from the
gasket. A hydrophobic filter is located on either side of the wire mesh
disk.
7. Install the new hydrophobic filters and/or wire mesh disk making sure a
hydrophobic filter is located on each side of the wire mesh disk.
8. Reinstall the gasket with the parts into the case. Ensure that the
installation stub is lined up with the pump intake in the filter chamber.
9. Reinstall the filter holder with the cotton dust filter. Align the two wide
tabs on the bottom of the filter holder with the two wide slots in the case
where the filter holder fits. Push the filter holder into the case and turn it
1/4 turn clockwise until it snaps into place.
158 • Cotton Filter, and Wire Mesh Disk
GX-2012 Operator’s Manual, CSA Version
Parts List
Table 7 lists part numbers for the GX-2012’s replacement parts and
accessories.
Table 9: Parts List
Part Number
Description
06-1248RK-03
Calibration kit tubing, 3 foot length
07-2005RK
Gasket, filter/screen retaining
13-0112RK
Wrist strap
17-1001RK
Tapered rubber nozzle
17-4430RK-01
Purge tee fitting
21-1833RK
Filter holder, clear plastic
33-0159RK
Hydrophobic disk filter
33-1031RK
Cotton ball 25 pack, for replacement of cotton dust filter
33-1112RK
Wire mesh disk filter
33-7102RK
Charcoal filter disk, 5 pack, for CO sensor
33-7114RK
Filter disk, H2S scrubber, 5 pack, for LEL sensor
47-5084RK
USB/IrDA adapter module (without USB cable)
47-5084RK-01
USB/IrDA adapter assembly (with module and USB cable)
47-5085RK
Cable, USB A to USB mini, 6 feet, for USB/IrDA adapter module
49-0115RK
AC adapter for charging station
49-1120RK
AA size alkaline battery
49-1615RK-CSA
Lithium ion battery pack
49-1616RK-CSA
Alkaline battery pack without batteries
49-1616RK-01
Battery cover, alkaline battery pack
49-1616RK-02CSA
Battery base, without cover, alkaline battery pack
49-2020RK
DC adapter for charging station
49-2180RK
Charging station only, no AC adapter
49-2180RK-01
Charging station with AC adapter, 110/115/220 VAC
49-2181RK
Charging station with 12 VDC vehicle plug adapter
71-0239RK
Operator’s Manual, Model GX-2012 (this document)
71-0245RK
Operator’s Manual, GX-2012 Data Logger Management Program
GX-2012 Operator’s Manual, CSA Version
Parts List • 159
Table 9: Parts List (cont.)
Part Number
Description
80-0009RK-XX
Sample hose. Replace “XX” with length in feet. Available lengths for
the GX-2012 are 2, 3, 10, 15, 20, 25, 30, 40, and 50 feet.
80-0101RK
8 meter hose with floating head
80-0140RK
32” telescoping probe with dust filter
80-0144RK
7’ telescoping probe with dust filter
80-0150RK
10” sample probe with dust filter
80-0155RK
30” aluminum probe
80-0157RK
30” fiberglass bar hole probe
80-0225RK
Hydrophobic filter
80-0404RK
1:1 dilution fitting
81-GX03CO
Calibration kit, for LEL/Oxy/CO unit, 58 liter
81-GX03CO-DLV
Calibration kit, for LEL/Oxy/CO unit, 34 liter steel
81-GX03HSCO
Calibration kit, for LEL/Oxy/H2S/CO unit, 58 liter
81-GX03HSCO-DLV
Calibration kit, for LEL/Oxy/H2S/CO unit, 34 liter aluminum
81-GX03VCO
Calibration kit, for %VOL(CH4)/LEL/Oxy/CO unit, 58 liter
81-GX03VCO-DLV
Calibration kit, for %VOL(CH4)/LEL/OxyCO unit, 34 liter steel
81-GX03VHSCO
Calibration kit, for %VOL(CH4)/LEL/Oxy/H2S/CO unit, 58 liter
81-GX03VHSCODLV
Calibration kit, for %VOL(CH4)/LEL/Oxy/H2S/CO unit, 34 liter
aluminum
81-0012RK-01
Calibration cylinder, 50% LEL methane in air, 34 liter
81-0012RK-03
Calibration cylinder, 50% LEL methane in air, 103 liter
81-0016RK-05
Calibration cylinder, 100% volume methane in nitrogen, 58 liter
81-0018RK-01
Calibration cylinder, 50% LEL isobutane in air, 34 liter
81-0018RK-03
Calibration cylinder, 50% LEL isobutaine in air, 103 liter
81-0076RK-01
Calibration cylinder, zero emission air, 34 liter steel
81-0076RK-03
Calibration cylinder, zero emission air, 103 liter
81-0090RK-01
Calibration cylinder for demand-flow regulator kit, 34 liter steel;
three-gas (CH4; O2; CO)
81-0090RK-03
Calibration cylinder for demand-flow regulator kit, 103 liter;
three-gas (CH4; O2; CO)
81-0154RK-02
Calibration cylinder for demand-flow regulator kit, 58 liter;
four-gas (CH4; O2; CO; H2S)
160 • Parts List
GX-2012 Operator’s Manual, CSA Version
Table 9: Parts List (cont.)
Part Number
Description
81-0154RK-04
Calibration cylinder for demand-flow regulator kit, 34 liter aluminum;
four-gas (CH4; O2; CO; H2S)
81-1054RK
Regulator, demand-flow type (for 34 liter aluminum and 58- and
103-liter calibration cylinders)
81-1055RK
Regulator, demand-flow type (for 17- and 34-liter steel calibration
cylinders)
83-0007RK
Downloading software
ES-1821
Carbon monoxide sensor
ES-1827i
Hydrogen sulfide sensor
NC-6264B
% LEL/ppm combustibles sensor
OS-BM2
Oxygen sensor
TE-7561
TC %volume combustibles sensor
GX-2012 Operator’s Manual, CSA Version
Parts List • 161
Appendix A: Calibrating and Bump Testing with a
Sample Bag
Overview
The GX-2012 can be calibrated and bump tested with a gas bag calibration
kit instead of a demand flow regulator kit. Appendix A describes how to use
a sample bag calibration kit to calibrate and bump test the GX-2012. A parts
list at the end of this appendix lists spare parts for the calibration kit.
Calibration/Bump Test Supplies and Equipment
Calibration Tubing
Regulator
Calibration Cylinder
Gas Bag
Hose Clamp
Figure 29: Gas Bag Calibration Kit
162 • Overview
GX-2012 Operator’s Manual, CSA Version
To calibrate or bump test the GX-2012, you will need:
• Known calibrating samples of the gases being detected. The combustible
and toxic gas samples should have concentrations in approximately the
middle of the range of detection. An oxygen-free source, such as 100%
nitrogen is recommended for setting the oxygen zero when using single
calibration.
WARNING: When using auto calibration, the multi-gas cylinder must
have an oxygen concentration in the range of 10% - 18%
oxygen.
• A gas collection bag with hose clamp
• A 0.5 LPM fixed-flow regulator or dispensing valve
• Non-absorbent tubing
To calibrate the %LEL, Oxygen, CO, and H2S sensors at the same time,
automatically, with no need for a zero-oxygen source, you can use the auto
calibration feature with a 4-gas cylinder. If the H2S channel is not active, then
a 3-gas cylinder may be used for auto calibration. This appendix includes
instructions for auto calibration with a fixed flow regulator or dispensing
valve, a 4-gas cylinder, and a %volume methane cylinder. This document
also includes instructions for calibrating one channel at a time using single
calibration.
NOTE: If the combustible gas channel(s) are calibrated to a gas other
than methane, use an appropriate multigas cylinder or use
single calibration to calibrate the combustible channel(s).
Preparing for Calibration or
Bump Testing
Whether you will calibrate the GX-2012 using auto calibration or single
calibration, or perform a bump test, you will need to set the fresh air readings
first before setting the span readings for each gas.
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 in “Turning On the GX-2012, Normal Mode
Only” on page 19 using the sample hose and probe.
3. With the unit on, perform a fresh air adjustment by pressing and holding
the AIRS button. The display prompts you to hold the AIRS button.
GX-2012 Operator’s Manual, CSA VersionPreparing for Calibration or Bump Testing • 163
4. Continue to hold the AIRS button until the display prompts you to
release it. The GX-2012 will count down from 8 as it sets the fresh air
reading for all channels. If the combustible channel is set as %LEL only
or vol% only, there is no countdown period. The fresh air reading is set
immediately.
5. Slide the tubing clamp onto the tubing and connect the tubing onto the
sample bag’s inlet. Leave the clamp unclamped for now.
6. Connect the other end of the tubing to the regulator’s or dispensing
valve’s hose barb fitting.
7. Fill the gas collection bag by screwing the fixed flow regulator onto the
calibration cylinder or by screwing the dispensing valve onto the
calibration cylinder and turning the knob counterclockwise.
NOTE: If the regulator has no on/off knob, then gas will begin to flow at 0.5
LPM as soon as the regulator is connected to the cylinder.
8. Allow the gas to dispense until the gas collection bag is a little over half
full.
9. If a fixed flow regulator without a knob is used, disconnect it from the
cylinder and immediately clamp down the hose clamp to prevent the
release of gas from the gas collection bag.
If a fixed flow regulator with a knob or a dispensing valve is used, turn
the knob clockwise to stop the gas flow, clamp down the hose clamp and
remove the regulator or dispensing valve from the cylinder.
10. Disconnect the tubing from the regulator or dispensing valve.
164 • Preparing for Calibration or Bump Testing
GX-2012 Operator’s Manual, CSA
Calibrating the GX-2012
From Measuring Mode, enter Calibration Mode by pressing and holding the
(SHIFT)T button, then pressing the DISPLAY(ADJ) button and releasing
both. If the unit prompts you for the password, enter it by using the AIRS
and (SHIFT)T buttons to select each password number and then pressing
and releasing POWER ENTER to confirm it and move on to the next number.
To go back a number, press and release the RESET SILENCE button. The
factory set password is the same as the factory set password for Maintenance
Mode: 2102. You can change the password by entering the PASSWORD
menu item in Maintenance Mode. See “Turning the Password Function On or
Off” on page 141. If you enter an incorrect password, an error screen will
display.
Err
PASSWORD
To return to normal operation, press and release the RESET SILENCE
button. You may then try to reenter Calibration Mode.
MAINTENANCE will appear along the top of the screen once you have
entered Calibration Mode. The first item in the calibration menu, AIR CAL,
displays.
NOTE: The following screens illustrate a four-gas GX-2012 with both a %
LEL and a % volume combustible sensor as examples only. Your
GX-2012 may display slightly different screens.
MAINTENANCE
AIR CAL
GX-2012 Operator’s Manual, CSA Version
Calibrating the GX-2012 • 165
The GX-2012’s calibration menu includes two methods of calibration:
auto calibration and single calibration.
• Auto Calibration: This method allows you to calibrate the combustible
gas (%LEL sensor only), OXY, H2S, and CO sensors simultaneously. It is
designed for use with the RKI 4-gas calibration cylinder and is the
quickest and easiest method to calibrate the GX-2012. If installed, you
may also calibrate the %volume sensor separately from the standard four.
• Single Calibration: This method allows you to calibrate one sensor at a
time. Use this method if you are only calibrating one or two sensors, if
you are calibrating only the %volume combustible sensor, or if you are
not using the RKI 4-gas calibration cylinder.
Calibrating with the Auto Calibration Method
This section describes calibration using the auto calibration method.
To calibrate using the single calibration method, see “Calibrating with the
Single Calibration Method” on page 169. These instructions assume you are
using a 4-gas cylinder and a % volume methane cylinder.
NOTE: If the combustible gas channel(s) are calibrated to a gas other
than methane, use an appropriate multigas cylinder or use
single calibration to calibrate the combustible channel(s).
1. You may only calibrate either the standard 4 sensors or the % volume
combustible gas sensor at a time. Once you are finished, you are returned
to the initial AUTO CAL screen and must begin the auto calibration
process again.
2. Use the AIRS and (SHIFT)T buttons to scroll to the AUTO CAL menu
item. Press and release the POWER ENTER button to display the
calibration values screen. If you want to exit back to the main menu
without completing a calibration, press and release the DISPLAY (ADJ)
button.
166 • Calibrating the GX-2012
GX-2012 Operator’s Manual, CSA Version
3. Use the AIRS or (SHIFT)T button to alternate between the 4-gas and
the % volume combustible gas calibration values screens.
MAINTENANCE
50
O2
12.0
CO
50
H2 S
25.0
AUTO CAL
CH4
%LEL
%
ppm
ppm
MAINTENANCE
CH4
100
vol%
AUTO CAL
4. The gas concentrations displayed in the calibration values screen must
match the gas concentrations listed on the calibration cylinders. If all
concentrations match, go to step 12. If one or more concentrations do not
match, continue with step 5.
5. To adjust the values on the screens, hold down the (SHIFT)T button,
then press the DISPLAY(ADJ) button and release both. The %LEL
sensor is shown.
MAINTENANCE
CH4
---
%LEL
AUTO CAL
6. Use the AIRS and (SHIFT)T buttons to scroll through the sensors and
select the sensor whose calibration gas value you want to adjust.
7. Press and release the POWER ENTER button. The sensor’s calibration
gas value will flash.
8. If necessary, use the AIRS and (SHIFT)T buttons to set the correct
calibration gas value.
9. Press and release the POWER ENTER button to save the change.
10. Repeat steps 6 through 9 to set the correct values for any additional
GX-2012 Operator’s Manual, CSA Version
Calibrating the GX-2012 • 167
sensors.
11. After the last calibration gas value is set, use the AIRS button to scroll to
ESCAPE and press POWER ENTER to return to the calibration gas
values screens.
NOTE: The RKI Four Gas Cylinder typically contains 12% O2 by volume.
Be sure to set the “OXY” reading to agree with the concentration
listed on the cylinder’s label, not zero.
12. Use the AIRS and (SHIFT)T button to select which sensor(s) you want
to calibrate, the standard 4 sensors or the % volume combustible gas
sensor.
The following instructions illustrate calibrating the standard 4 sensors
first, then the %volume combustible gas sensor.
13. With the 4-gas calibration values screen displayed, press the POWER
ENTER button. AUTO CAL begins to flash and the current gas readings
are displayed. If you want to exit back o the main menu without
completing a calibration, press and release the DISPLAY (ADJ) button.
MAINTENANCE
0
O2
20.9
CO
0
H2 S
0.0
AUTO CAL
CH4
%LEL
%
ppm
ppm
14. Open the hose clamp and connect the tubing from the filled gas bag to the
rigid tube on the probe. Allow the gas to flow for one minute.
15. Press and release the POWER ENTER button to set the calibration to the
programmed values.
If all channels passed calibration, PASS displays along the bottom of the
screen, then the calibration menu displays.
168 • Calibrating the GX-2012
GX-2012 Operator’s Manual, CSA Version
If any of the sensors cannot calibrate to the proper value, FAIL displays
along the bottom of the screen and the GX-2012 lists the sensor(s) that
failed to calibrate. In the example below, the OXY and H2S channels
failed calibration. The other sensors calibrated normally.
MAINTENANCE
O2
%
H2 S
ppm
FAIL
The buzzer and alarm lights activate. Press and release the RESET
SILENCE button after the buzzer and lights stop to reset the alarm and
return to the calibration menu. Attempt to calibrate again. If the failure
continues, investigate the cause. See “Troubleshooting” on page 143.
16. Disconnect the tubing from the probe.
17. If you have a 5 sensor unit and wish to calibration the %volume
combustible gas sensor, go back to step 1 and repeat the process,
selecting the %volume calibration gas value screen in step 12 and using a
%volume methane cylinder to fill your gas bag.
If you are finished calibrating, use the (SHIFT)T button to navigate to
the NORMAL menu item, then press and release the POWER ENTER
button to return to Measuring Mode.
Calibrating with the Single Calibration Method
This section describes calibration using the Single Calibration method.
To calibrate using the Auto Calibration method, see “Calibrating with the
Auto Calibration Method” on page 166.
The procedure below describes a span adjustment of one channel
using a calibration kit that includes a 4-gas calibration cylinder, a 0.5
LPM (liters per minute) regulator, and non-absorbent sample tubing.
The standard 4-gas cylinder consists of 50% LEL methane, 12%
oxygen, 50 ppm CO, 25 ppm H2S, and a balance of nitrogen. In the
example below, the CH4 channel’s span is adjusted. See “Parts List”
on page 159 for available calibration kits and calibration kit spare
parts.
Calibration cylinders that contain only one target gas may also be
used for single calibration. For channels other than oxygen, RKI
Instruments, Inc. recommends that you use a cylinder that contains a
GX-2012 Operator’s Manual, CSA Version
Calibrating the GX-2012 • 169
concentration of 10-50% of the full scale value of the target gas. For
example, if you are calibrating the combustible gas channel, your
calibration cylinder should have a combustible gas concentration
between 10% LEL and 50% LEL. For the oxygen channel, RKI
Instruments, Inc. recommends using 100% nitrogen to perform the
adjustment but any concentration between 0% oxygen (100%
nitrogen) and 17% oxygen can be used to make the adjustment.
NOTE: If your combustible gas channel is calibrated to a gas other
than methane, use an appropriate gas cylinder to perform the
calibration.
CAUTION: The single calibration method does not have a “FAIL”
notification. If a sensor cannot be set to agree with the
calibration source, see “Troubleshooting” on page 143.
1. While in the calibration menu, use the AIRS or (SHIFT)T button to the
ONE CAL menu option.
MAINTENANCE
ONE CAL
2. Press and release the POWER ENTER button to display the single
calibration menu. The %LEL sensor will be displayed first.
MAINTENANCE
CH4
---
%LEL
ONE CAL
170 • Calibrating the GX-2012
GX-2012 Operator’s Manual, CSA Version
3. Use the AIRS or (SHIFT)T button to display the sensor you want to
calibrate (in this example the combustible gas % LEL sensor). If you
have a 5 sensor unit, the %vol sensor will be one of the choices. It is
shown below.
MAINTENANCE
CH4
---
vol%
ONE CAL
4. Press and release the POWER ENTER button. The single calibration
screen displays for the sensor you selected. The gas reading flashes.
MAINTENANCE
CH4
0
%LEL
ONE CAL
5. Connect the tubing from the filled gas bag to the rigid tube on the probe.
Allow the calibration gas to flow for one minute.
6. If necessary, use the AIRS and (SHIFT)T buttons to adjust the reading
to match the concentration listed on the calibration cylinder.
If the reading already matches the concentration listed on the calibration
cylinder, press and release the AIRS button then press and release the
(SHIFT)T button so that the instrument sees a change and resets the
calibration date.
7. Press and release the POWER ENTER button to save the span value. The
LCD will indicate that the calibration has ended, then the single
calibration menu displays.
MAINTENANCE
ONE CAL
GX-2012 Operator’s Manual, CSA Version
Calibrating the GX-2012 • 171
8. Disconnect the tubing from the GX-2012’s probe.
9. Repeat steps 3 through 8 for any other sensors you want to calibrate.
Make sure you use an appropriate calibration cylinder for each sensor.
CAUTION: When calibrating the oxygen channel, verify the concentration
of oxygen listed on the cylinder’s label. For oxygen-free samples
(100% nitrogen for example), set the oxygen zero setting to
0.0%.
10. After the last channel is calibrated, disconnect the calibration tubing from
the probe.
11. Use the AIRS and (SHIFT)T buttons to scroll to ESCAPE in the ONE
CAL menu.
12. Press and release the POWER ENTER button to exit ONE CAL.
13. With the ONE CAL menu option displayed, press the (SHIFT)T button
until the NORMAL menu option is displayed.
14. Press and release the POWER ENTER button to return to Measuring
Mode.
Bump Testing
NOTE: The BUMP DSP menu item in Maintenance Mode is factory set to
OFF. The BUMP menu item will not appear unless BUMP DSP is
set to ON. See “Turning the Bump Test Function On or Off” on
page 125 for instructions.
NOTE: The GX-2012 uses parameters defined in the BUMP--SET menu
item of Maintenance Mode while performing a bump test. To view
or update these parameters, see “Updating the Bump Test
Parameters” on page 127.
NOTE: If the combustible gas channel(s) are calibrated to a gas other than
methane, use an appropriate multigas cylinder.
172 • Bump Testing
GX-2012 Operator’s Manual, CSA Version
From Measuring Mode, enter Calibration Mode by pressing and holding the
(SHIFT)T button, then pressing the DISPLAY(ADJ) button and releasing
both. If the unit prompts you for the password, enter it by using the AIRS
and (SHIFT)T buttons to select each password number and then pressing
and releasing POWER ENTER to confirm it and move on to the next number.
To go back a number, press and release the RESET SILENCE button. The
factory set password is the same as the factory set password for Maintenance
Mode: 2102. You can change the password by entering the PASSWORD
menu item in Maintenance Mode. See “Turning the Password Function On or
Off” on page 141. If you enter an incorrect password, an error screen will
display.
Err
PASSWORD
To return to normal operation, press and release the RESET SILENCE
button. You may then try to reenter Calibration Mode.
MAINTENANCE will appear along the top of the screen once you have
entered Calibration Mode. The first item in the calibration menu, AIR CAL,
displays.
1. Slide the tubing clamp onto the tubing and connect the tubing onto the
sample bag’s inlet. Leave the clamp unclamped for now.
2. Connect the other end of the tubing to the regulator’s or dispensing
valve’s hose barb fitting.
3. Fill the gas collection bag by screwing the fixed flow regulator onto the
calibration cylinder or by screwing the dispensing valve onto the
calibration cylinder and turning the knob counterclockwise.
NOTE: If the regulator has no on/off knob, then gas will begin to flow at 0.5
LPM as soon as the regulator is connected to the cylinder.
4. Allow the gas to dispense until the gas collection bag is a little over half
full.
5. If a fixed flow regulator without a knob is used, disconnect it from the
cylinder and immediately clamp down the hose clamp to prevent the
release of gas from the gas collection bag. If a fixed flow regulator with a
knob or a dispensing valve is used, turn the knob clockwise to stop the
GX-2012 Operator’s Manual, CSA Version
Bump Testing • 173
gas flow, clamp down the hose clamp and remove the regulator or
dispensing valve from the cylinder.
6. Disconnect the tubing from the regulator or dispensing valve.
7. Install the hose and probe to the GX-2012.
8. Use the AIRS or (SHIFT)T buttons to display the BUMP menu item.
MAINTENANCE
BUMP
9. Press and release the POWER ENTER button to display the bump test
gas values.
MAINTENANCE
50
O2
12.0
CO
50
H2 S
25.0
BUMP 30
CH4
%LEL
%
ppm
ppm
10. Use the AIRS or (SHIFT)T buttons to see the %volume combustible
gas bump test value.
MAINTENANCE
CH4
BUMP
100
vol%
30
11. A bump test may be performed on the standard 4 sensors or on the
%volume combustible sensor. Use the AIRS or (SHIFT)T buttons to
display the screen for the sensor(s) you wish to bump test.
12. Before proceeding, confirm that the bump test gas value(s) are the same
as the concentration(s) in the calibration cylinder. If they are not, adjust
the bump test gas value(s) by entering the AUTO CAL menu item,
changing the values there, and reentering the BUMP menu.
174 • Bump Testing
GX-2012 Operator’s Manual, CSA Version
13. Open the hose clamp and connect the tubing from the filled gas bag to the
rigid tube on the probe and quickly press and release the POWER
ENTER button. The unit will begin counting down from 30.
14. When AUTO CAL in the BUMP--SET menu item in Maintenance Mode
is set to OFF:
•
The instrument will indicate which channels passed or failed the
bump test with a P (pass) or an F (fail) to the right of the gas.
MAINTENANCE
CH4
O2
CO
H2 S
F
P
F
P
%LEL
%
ppm
ppm
BUMP
•
To view the bump test gas readings press the AIRS or (SHIFT)T
button. You can scroll between the bump test results and the bump
test gas readings with the AIRS or (SHIFT)T buttons.
MAINTENANCE
CH4
O2
CO
H2 S
5
12.0
10
25.0
%LEL
%
ppm
ppm
BUMP
•
To return to the BUMP screen in Calibration Mode, press POWER
ENTER.
MAINTENANCE
BUMP
If one or more sensors fail the bump test, see “Troubleshooting” on
page 143 to investigate the cause of the failure and replace the failed
sensor or sensors if necessary.
•
Disconnect the tubing from the probe.
GX-2012 Operator’s Manual, CSA Version
Bump Testing • 175
15. When AUTO CAL in the BUMP--SET menu item in Maintenance Mode
is set to ON:
If all channels pass the bump test,
•
The following screen appears:
MAINTENANCE
CH4
O2
CO
H2 S
F
P
F
P
%LEL
%
ppm
ppm
BUMP
•
To view the bump test gas readings press the AIRS or (SHIFT)T
button. You can scroll between the bump test results and the bump
test gas readings with the AIRS or (SHIFT)T buttons.
MAINTENANCE
CH4
O2
CO
H2 S
45
12.0
47
23.0
%LEL
%
ppm
ppm
BUMP
•
To return to the BUMP screen in Calibration Mode, press POWER
ENTER.
MAINTENANCE
BUMP
•
Disconnect the tubing from the probe.
If any channel fails the bump test,
•
The instrument will beep and a calibration is immediately and
automatically started. Continue to apply the calibration gas. CAL on
the bottom left of the screen will alternate with APPLY.
The calibration time will begin to countdown in seconds in the lower
right of the screen. The calibration time counted down during a
176 • Bump Testing
GX-2012 Operator’s Manual, CSA Version
calibration initiated because of a failed bump test is the difference
between the bump test gas time and the calibration time defined in the
BUMP--SET menu item in Maintenance Mode.
MAINTENANCE
CH4
O2
CO
H2 S
CAL
•
1
20.9
37
10.0
60
%LEL
%
ppm
ppm
At the end of the calibration, the instrument displays the results from
both the bump test and the calibration. Use the AIRS or (SHIFT)T
buttons to scroll between the calibration/bump test results, the bump
test gas readings, and the calibration gas readings.
MAINTENANCE
FP
O2
PP
CO
FF
H2 S
PP
BUMP/CAL
CH4
%LEL
%
ppm
ppm
MAINTENANCE
1
O2
12.0
CO
5
H2 S
23.0
BUMP/
CH4
%LEL
%
ppm
ppm
MAINTENANCE
CH4
O2
CO
H2 S
•
49
12.0
5
25.0
/CAL
%LEL
%
ppm
ppm
To return to the BUMP screen in Calibration Mode, press POWER
GX-2012 Operator’s Manual, CSA Version
Bump Testing • 177
ENTER at any time. If any channel failed the calibration, the buzzer
will sound a double pulsing tone until you press and release the
POWER ENTER button.
MAINTENANCE
BUMP
•
Disconnect the tubing from the probe.
16. With the BUMP menu option displayed, press the (SHIFT)T button until
the NORMAL menu option is displayed.
17. Press and release the POWER ENTER button to return to Measuring
Mode.
Parts List
Table 10: Sample Bag Calibration Kit Spare Parts
Part Number
Description
81-0016RK-05
Calibration cylinder, 100% volume methane in nitrogen, 58 liter
81-0090RK-01
Calibration cylinder, 3-gas mix, LEL/Oxygen/CO, 34 liter
81-0154RK-04
Calibration cylinder, 4-gas mix, LEL/Oxygen/CO/H2S, 34 liter
81-1001RK
Dispensing valve, for 17/34 liter steel cylinders
81-1051RK
Regulator with gauge and knob, 34AL/58 liter/103 liter cylinders,
0.5 LPM
81-1126RK
Gas bag with clamp and hose barb, 9” x 9”, 2 liter
81-GX03CO-LV
Calibration kit with sample bag, for LEL/Oxy/CO unit, 34 liter steel
81-GX03HSCO-LV
Calibration kit with sample bag, for LEL/Oxy/H2S/CO unit, 34 liter
aluminum
81-GX03VCO-LV
Calibration kit with sample bag, for %VOL(CH4)/LEL/Oxy/CO unit, 34
liter steel
81-GX03VHSCO-LV
Calibration kit with sample bag, for %VOL(CH4)/LEL/Oxy/H2S/CO
unit, 34 liter aluminum
178 • Parts List
GX-2012 Operator’s Manual, CSA Version
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