Operation & Maintenance Manual
GASMAX IIx
Wireless Toxic / Oxygen / Combustible Gas Monitor
with Smart Sensor Interface
Important: Read and understand contents of this instruction manual
prior to use. Improper use of equipment could result in
instrument malfunction or serious injury.
GDS Corp.
2513 Hwy 646
Santa Fe, Texas 77510
(409) 927-2980
(409) 927-4180 (FAX)
www.gdscorp.com
tech@gdscorp.com
GASMAX IIx Wireless Monitor Instruction Manual
Revision 1.1
Table of Contents
SECTION 1 – SAFETY INFORMATION......................................................................................... 1
1.1
Safety Information – Read Before Installation & Applying Power ......................... 1
1.2
Contacting GDS Corp.................................................................................................. 1
SECTION 2 – GENERAL DESCRIPTION ...................................................................................... 2
2.1
Introduction.................................................................................................................. 2
2.2
Description of GASMAX IIx & Client / Server Wireless Networks .......................... 3
2.2.1 GASMAX IIX Radio Status (RS) Icons - Zzz’s, , , ,
........................... 3
2.2.2 RF Comm Cycle and Power Consumption ........................................................ 4
SECTION 3 – INSTALLATION INSTRUCTIONS ........................................................................... 5
3.1
Ratings and Certifications .......................................................................................... 5
3.2
Sensor Location .......................................................................................................... 5
3.3
Mounting the Enclosure.............................................................................................. 5
3.3.1 10-0322 Magnetic Mount Option ......................................................................... 5
3.4
Specifications .............................................................................................................. 7
3.5
Antenna Transmission Range.................................................................................... 7
3.5.1 Antenna Selection & Location ............................................................................ 8
3.6
Smart / Simple Sensors .............................................................................................. 9
3.7
I/O Board Wiring Installation............................................................................. 11
3.8
GASMAX IIx 900MHZ / 2.4GHZ RF MODULES ................................................. 12
SECTION 4 – INITIAL START-UP................................................................................................ 13
4.1
“Xmitter Config” Configuration Menu ..................................................................... 13
4.2
Initial Bridge Sensor Monitor Start-Up .................................................................... 13
4.2.1 Initial Bridge Sensor Monitor “Sensor Volts” Check ..................................... 13
4.2.2 Initial Bridge Sensor Monitor “Balance” Check.............................................. 13
4.2.3 Initial Bridge Sensor Monitor “Span” Check................................................... 13
4.3
Initial Toxic / Oxygen Monitor Start-Up ................................................................... 14
4.3.1 Initial Toxic / Oxygen Monitor “Span” Check.................................................. 14
SECTION 5 –ROUTINE OPERATING INSTRUCTIONS.............................................................. 14
5.1
CAL MODE - Routine Sensor Calibrations.............................................................. 14
5.2
ALARM OPERATION ................................................................................................. 16
5.2.1 ALARM 3 – UNDERSTANDING FAULT / LEVEL OPERATION ....................... 16
SECTION 6 – SETUP MENU CONFIGURATION ........................................................................ 16
6.1
Menus Database Configuration ............................................................................... 16
6.2
Configuration Using the Magnetic Wand:............................................................... 17
6.3
System Configuration Menus: ................................................................................. 18
•
User Info ................................................................................................................. 18
•
Eunits ...................................................................................................................... 18
•
Zero ......................................................................................................................... 18
•
Span ........................................................................................................................ 18
•
Decimal Points ....................................................................................................... 18
•
Cal Span Value ....................................................................................................... 18
•
Readout Deadband ................................................................................................ 18
•
Track Negative ....................................................................................................... 18
•
Backup Config........................................................................................................ 18
•
Restore Config. ...................................................................................................... 18
•
Upload Sensor Data............................................................................................... 18
6.4
Alarm Settings: .......................................................................................................... 19
•
Set Point ................................................................................................................. 19
•
Dead-Band .............................................................................................................. 19
•
ON Delay ................................................................................................................. 19
•
OFF Delay ............................................................................................................... 19
•
Low Trip .................................................................................................................. 19
•
Latching .................................................................................................................. 19
6.5
Sensor Information: .................................................................................................. 20
6.6
Clock / Warm-Up & Cal Purge Delays SETUP: ....................................................... 20
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6.7
COMMUNICATIONS SETUP: .................................................................................... 21
•
Hop Channel........................................................................................................... 21
•
Remote ID ............................................................................................................... 21
•
System ID................................................................................................................ 21
•
*TX Multiples .......................................................................................................... 21
•
*TX Mode................................................................................................................. 21
•
*TX Power ............................................................................................................... 22
•
TX Verbose ............................................................................................................. 22
•
Radio Status ........................................................................................................... 22
6.7.1 GASMAX IIx Operation with C1 Protector Controllers ................................... 22
6.7.2 GASMAX IIx Operation with C2 Quad Protector Controllers......................... 23
6.8
SYSTEM SECURITY: ................................................................................................. 23
6.9
LCD Contrast Adj: ..................................................................................................... 24
SECTION 7 – TECHNICIANS ONLY MENUS.............................................................................. 25
7.1
Introduction: .............................................................................................................. 25
7.2
Set Balance / Set Sensor Voltage (Technicians only!): ......................................... 25
7.2
Set Gain to Unity (Technicians only!): .................................................................... 26
7.3
PreAmp Gain Adjust (Technicians only!): .............................................................. 26
7.4
Simple Sensor Input Type (Technicians only!): ..................................................... 26
7.5
Zero Cal Value (Technicians only!): ........................................................................ 27
7.6
Raw Min / Max Counts (Technicians only!): ........................................................... 27
4
SECTION 1 – SAFETY INFORMATION
1.1
Safety Information – Read Before Installation & Applying Power
IMPORTANT
Users should have a detailed understanding of GASMAX IIx operating and maintenance
procedures. Use the GASMAX IIx only as specified in this manual or detection of gases and the
resulting protection provided may be impaired. Read the following WARNINGS prior to use.
WARNINGS
• Calibrate with known target gas at start-up and check on a regular schedule, at least
every 90 days. More frequent inspections are encouraged to spot problems such as dirt,
oil, paint, grease or other foreign materials on the sensor head.
• Do not paint the sensor assembly or the Transmitter.
• Do not use the GASMAX IIx if its enclosure is damaged or cracked or has missing
components.
• Make sure the cover, internal PCB’s and antenna connections are securely in place
before operation.
• Use only a sensor assembly compatible with the GASMAX IIx and approved by GDS
Corp.
• Periodically test for correct operation of the system’s alarm events by exposing the
monitor to a targeted gas concentration above the High Alarm setpoint.
• Do not expose the GASMAX IIx to electrical shock or continuous severe mechanical
shock.
• Protect the GASMAX IIx from dripping liquids and high power sprays.
• Use only for applications described within this manual.
CAUTION: FOR SAFETY REASONS THIS EQUIPMENT MUST BE OPERATED AND
SERVICED BY QUALIFIED PERSONNEL ONLY. READ AND UNDERSTAND INSTRUCTION
MANUAL COMPLETELY BEFORE OPERATING OR SERVICING.
ATTENTION: POUR DES RAISONS DE SÉCURITÉ, CET ÉQUIPEMENT DOIT ÊTRE UTILISÉ,
ENTRETENU ET RÉPARÉ UNIQUEMENT PAR UN PERSONNEL QUALIFIÉ. ÉTUDIER LE
MANUE D’INSTRUCTIONS EN ENTIER AVANT D’UTILISER, D’ENTRETENIR OU DE
RÉPARER L’ÉQUIPEMENT.
1.2
Contacting GDS Corp.
GDS Corp technical support is available between the hours of 7:30am and 5:00pm Monday
through Thursday and 7:30am until Noon on Friday Central Standard Time. Please call 409-9272980 or FAX 409-927-4180. Our email address is info@GDScorp.com and our website is
www.gdscorp.com. Our shipping address is 2513 Hwy 646, Santa Fe, TX 77510.
GASMAX IIx Wireless Monitor Instruction Manual
Revision 1.1
SECTION 2 – GENERAL DESCRIPTION
2.1
Introduction
This manual describes the externally powered GASMAX IIx Gas Monitor equipped with RF
Wireless Interface and RF firmware. The GASMAX IIx gas monitor is capable of accepting either
electrochemical sensors or bridge-type combustible or VOC sensors and requires an external 1030VDC power source. A separate manual is available for the GASMAX ECx battery powered
device which requires no external power or signal wiring but is limited to toxic and oxygen
measurements. Both units are single channel, fixed-point monitors designed to provide
continuous monitoring of gases in the workplace. Gas values are displayed in their engineering
units, graphically as bar graphs or 30-minute trends (Figure 2-1) and transmitted wirelessly to a
remote controller for alarm or data recording. Flashing front panel LED’s notify personnel when
alarm levels have been reached.
IMPORTANT: Periodic calibration checks are needed to assure dependable performance.
The GASMAX IIx gas monitor broadcasts on a license-free frequency of 900MHZ (specify
GASMAX IIx RF900) or 2.4GHZ (specify GASMAX IIx RF2400) to GDS Corp C1 Protector eight
or sixteen channel controllers or C2 Quad Protector Four Channel Controllers equipped with a
matching RF wireless modem and appropriate antenna. Each C1 Protector controller can
support up to sixteen remote wireless units; networks with more than sixteen detectors can easily
operate with multiple controllers.
Advanced microcontroller electronics and superior graphic LCD operator interface offers
enhanced diagnostics and fault analysis not possible in competing products. Non-volatile
memory retains all configuration data during power interruptions. The magnetic keypad allows
non-intrusive calibrations be performed by one person without opening the enclosure. A “real
time clock & calendar” feature allows logging of calibrations, alarm trips, communication faults
and other events for review on the LCD readout.
Compatible sensors provide an 8-wire Smart Sensor interface capable of uploading configuration
data to the GM IIx monitor. For remote sensor applications, simple sensors are also supported.
A separate PC compatible USB Interface device (part # 10-0252) allows Smart Sensors to be
loaded with configuration variables via a PC and, when connected to a GASMAX IIx local sensor
head, upload this data to the GASMAX IIx. This configuration data includes alarm set points,
range, target gas, calibration constants and other variables required for a specific application.
For Simple sensors without the smart interface, the USB device allows direct GASMAX IIx
configuration from a PC.
Additional features include:
•
•
•
•
•
•
•
•
•
On screen radio status icons indicate “Server In Range”, “Server Out of Range”, “Server
Previously Out of Range” and “Low Battery” conditions.
No potentiometer or jumper settings required. All setup is with menus accessed via the LCD
/ magnetic keypad operator interface without opening the enclosure.
Backlit LCD (remains illuminated for 10 seconds after any keystroke).
Field adjustable alarm levels flash front panel LED indicators for HIGH, WARN, FAIL
conditions. Alarm relays are not available with this low power model.
CAL MODE provides on-screen prompts when to apply cal gas during calibrations.
“Sensor life” bar-graph updates after each SPAN calibration indicating when to replace old
sensors.
Half hour trend screen shows rate of change of gas exposures.
Modular design affords efficient installation and plug in sensors allow changing target gases
even after installation.
New smart sensors are recognized by the GASMAX IIx and prompts users to either upload
new configuration data or continue with data from the previous smart sensor.
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•
•
Missing sensors trip the FAIL alarm.
Compatible sensors are industry proven for fast response and long life.
Figure 2-1: Data Displays
2.2
Description of GASMAX IIx & Client / Server Wireless Networks
All GDS Corp wireless transceivers utilize a FHSS (Frequency Hopping Spread Spectrum)
Server-Client network where multiple Clients synchronize their frequency hopping to a single
Server. The Server transmits a beacon at the beginning of every frequency hop (50 times per
second). Client transceivers listen for this beacon and upon receiving it synchronize their
hopping with the Server. GASMAX IIx monitors are often powered by solar arrays, so care is
taken to reduce power consuming RF transmissions to a minimum. GASMAX IIx monitors are
never used for Server operation and are always Clients.
Each GASMAX IIx wireless “broadcast” includes gas value, battery voltage and monitor status.
This wireless protocol interface operates only with GDS Corp C1 Protector or C2 Quad Protector
Controllers. Both controllers are capable of functioning as Clients or Servers but only one Server
is allowed per wireless network. Multiple C1 Protector or C2 Quad Protector Controllers may
receive the same transmissions from GASMAX IIx monitors.
Each transceiver on a wireless network must have its RADIO SETUP menus configured to share
the same Hop Channel and System ID to communicate (see section 6.7). There should never
be two servers with the same Hop Channel / System ID settings in the same coverage area as
the interference between the two servers will severely hinder RF communications. The Server
must be in a powered location and should be centrally located since all Clients must receive the
server’s beacon signal to communicate successfully.
Correct planning and design of wireless systems are important for ensuring a successful
installation. It is highly recommended that a site drawing indicating location of monitors and base
station, line of site obstructions, and sources of RF interference be submitted when requesting a
quotation.
2.2.1 GASMAX IIx Radio Status (RS) Icons - Zzz’s,
,
,
,
Figure 2-1 shows the GASMAX IIx data displays and identifies “radio status” (RS) icons which
appear on the LCD. RS icons, along with the TXD led (see Figure 2-1), are useful diagnostic
tools for evaluating RF communication. Status conditions indicated by the RS icon are Sleep
(server’s beacon received at most recent attempt), Server
Mode - Zzz’s, Server In Range (server’s beacon not received at most recent attempt), Server Previously Out
Out of Range and Low Battery . The Server “Previously Out of Range” icon is useful in
of Range determining if intermittent communication failures are a result of this monitor having problems
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receiving the Server’s beacon. The duration and frequency of “out of range” conditions are stored
in the Event Log table described in Section 6.4. Low Battery conditions also flash the FAIL led.
It is important to understand RS icons only update as the TXD LED flashes indicating an RF
transmission has occurred. RF transmissions are typically each 5-minutes, but increase to each
6-seconds during alarm conditions.
2.2.2 RF Communications Cycle and Power Consumption
Wireless systems are often battery or solar powered and therefore power consumption must be
kept low. The majority of power is consumed when the radio communicates to the wireless
network. Each Communications cycle consists of the following operations: 1) wake the radio in
receive mode; 2) listen for the Server’s beacon; 3) synchronize to the Server’s hopping frequency
to become “In Range ”; 4) transmit data packet out the antenna and return to sleep mode.
This sequence takes from .25 to 1 second to complete. If the radio fails to synchronize upon the
initial attempt it waits 6 seconds and tries again, then waits 6 seconds and tries once more. If the
third attempt fails the “Out of Range ” icon appears and the GASMAX IIx returns to its
Communications cycle. Out of range will also be logged into the Event Log (see section 6.4).
Every 6 seconds, the monitor performs a “sniff test” to detect the level of target gas present at the
sensor. At each “sniff test”, the Zzz’s “Sleep Mode” icon is briefly replaced by an RS icon as
described above in section 2.2.1. At this time the readout updates to indicate gas value
measured at the “sniff test”. The radio stays OFF if the gas value does not trip A1 or A2 alarms.
Except upon the 50th consecutive “sniff test” (every 5-minutes) the radio turns on, receives the
Server’s beacon, and transmits its data. These 5-minute transmissions allow C2 Quad Protector
or C1 Protector Controllers to confirm a good wireless link even when no alarms exist. If A1 or
A2 alarms do exist during the “sniff test”, the radio wakes, receives the Server’s beacon, and
transmits its data immediately.
The following list identifies each of the conditions that cause the radio to transmit:
•
•
•
•
•
Broadcast every 5 minutes when there is no A1 or A2 alarm. This allows the receiving
controller to monitor the link and report “Communications (Comm) Error” if the monitor
does not reply for periods of greater than 18-minutes.
Broadcast every 6 seconds if there is an A1 or A2 level alarm.
Broadcast upon entry into CAL MODE. When entering CAL MODE, the GASMAX IIx
sends a digital value of 75 counts (-15.6% FS). Controllers receiving this value indicate
“IN CAL” reading.
Broadcast upon ENTRY into CAL PURGE. When entering CAL PURGE, the GASMAX IIx
sends a digital value of 200 counts (0% FS). NOTE: To prevent A1 & A2 “low trip”
alarms, GASMAX IIx units configured for OXYGEN transmit a reading of 20.9% upon
entry into CAL PURGE.
Holding the magnet to the UP key for >8 seconds forces a transmission of the current
reading value.
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SECTION 3 – INSTALLATION INSTRUCTIONS
3.1
Ratings and Certifications
The enclosure is NRTL certified for Division 1 hazardous area installations for explosion-proof
Class 1 Groups B,C,D (see Figure 3-1). The GASMAX IIx is designed to meet ISA 92.0.01 Part 1
for Toxic Monitors. The 10-0295 antenna fitting has an RP-SMA connector and is suitable for
Division 2 classified areas. An optional 1000-2193 antenna is also available for Division 1
classified areas. Figure 3-3 shows both antenna styles.
3.2
Sensor Location
Factors such as air movement, gas density in relation to air, emission sources and environmental
variables affect correct sensor location. Air movement by fans, prevailing winds and convection
should be carefully evaluated to determine if a leak is more likely to raise gas levels in certain
areas within the facility. Vapor density of a gas determines if it will rise or fall in air when there
are no significant currents. Lighter than air gases should have the monitors mounted 12 – 18
inches (30 – 45 centimeters) above the potential gas leak and heavier than air gases should be
this distance below. Even though the GASMAX IIx is designed for rugged service, sensors
should be protected from environmental damage from water, snow, shock, vibration and dirt.
3.3
Mounting the Enclosure
The GASMAX IIx standard enclosure is a cast aluminum explosion-proof (NEMA 7) enclosure
shown in Figure 3-1. Modular design simplifies the installation of the GASMAX IIx (Figure 3-2).
The GASMAX IIx antenna should typically be mounted with “line of sight” access to the
controller’s base station antenna. If a good “line of sight” angle is not possible the GASMAX IIx
monitor will usually still function properly at ranges up to 1500 feet but obstructions should be
kept to a minimum.
WARNING: Qualified personnel should perform the installation according to applicable electrical
codes, regulations and safety standards. Ensure correct cabling and sealing fitting practices are
implemented. Install the GASMAX IIx to a wall or bracket using the predrilled mounting flanges
with I.D. 0.25 on 5.0 inch centers (Figure 3-1).
CAUTION: Optional Sensor heads should never be installed pointing upwards.
3.3.1 10-0322 Magnetic Mount Option
GDS Corp offers square aluminum plate, with a magnet on each corner, to bolt to the back of the
GASMAX IIx instrument enclosure. The 10-0322 Magnetic Mount securely attaches the
assembly to solid steel structure that is at least 6 inches wide.
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GASMAX IIx Wireless Monitor Instruction Manual
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Figure 3-1: GASMAX IIx Explosion-Proof Housing
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Figure 3-2: Outline Drawing
3.4
Specifications
Power Supply:
10-30 VDC applied to TB2 on 10-0233 I/O PCB.
Power Consumption:
<20mA during “sleep” mode, 60mA during “receive beacon” mode, up to 1 amp during 1 watt
“transmit” mode. Transmit power may be set from 10mW to 1 watt (see Section 6-7)
RF900 Transmit (TX) Power
30dBm at highest 1W power setting. 900MHZ Transmit Power may be set from 10mW to 1 watt
(see Section 6-7)
RF2400 Transmit (TX) Power
2.4GHZ model Transmit Power is fixed at 50mW.
Receive (RX) Sensitivity
-100 dBm (RF900); -90 dBm (RF2400)
Radio Frequency
RF900 model hopping occurs between 902 – 928MHZ. RF2400 between 2.4 & 2.5GHZ.
Memory:
Non-volatile E2 memory retains configuration values in the event of power outages.
3.5
Antenna Transmission Range
The distance radio signals can travel is dependent upon several factors including antenna design,
transmitter power and Freespace losses. In order for a wireless link to work, the available system
operating margin (TX power - RX Sensitivity + Antenna gains) must exceed the Freespace
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GASMAX IIx Wireless Monitor Instruction Manual
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loss and all other losses in the system. For best RF line-of-site, the combined height of both
antennas must exceed the Fresnel zone diameter (see below).
Dist. between ant's
1000 ft (300 m)
1 Mile (1.6 km)
5 miles (8 km)
10 miles (16 km)
Fresnel zone diameter
16 ft (4.9 m)
32 ft (9.7 m)
68 ft (20.7 m)
95 ft (29 m)
Freespace loss (dB)
81
96
110
116
Example:
The RF900 900MHZ radio modem has the following parameters:
•
•
•
Maximum RF TX power setting = 30 dBm (1 Watt)
RF RX sensitivity = -100 dBm (this is a constant)
Antenna gain (standard equipped dipole) = 2.1dBi x 2 = 4.2dBi
So the system operating margin is 30 - (-100) + 4.2 = 134.2 dBm. This is enough to transmit 10
miles if freespace was the only loss in the system. For this to be the case, the antennas must be
mounted with a combined height greater than 95ft above all obstructions (including the ground) to
keep the fresnel zone clear. In practice however, there are many losses in the system besides
just freespace and it is recommended there be at least 20dB extra system operating margin.
RF “Rules of Thumb”
• Doubling the range with good RF “Line of Site” (LOS) requires an increase of 6 dB.
• Doubling the range without good RF LOS requires an increase of 12 dB.
3.5.1 Antenna Selection & Location
A site survey using an RF spectrum analyzer and test radios is highly recommended.
The location of the antenna is very important. Ensure the area surrounding the proposed location
is clear of objects such as other antennas, trees or power lines which may affect the antenna’s
performance and efficiency. It is also vital that you ensure the support structure and mounting
arrangement is adequate to support the antenna under all anticipated environmental conditions.
The choice of appropriate mounting hardware is also important for both minimizing corrosion and
maintaining site performance.
Most installations utilize locally mounted dipole antennas as shown in Figure 3-3. An option is
available for a 6 foot riser to increase the height of the antenna 6 feet above the ST-48EC/RF
monitor. Extreme cases may require special order of directional antennas mounted in such a way
to allow aiming towards the base station antenna. Minimize obstructions between the ST48EC/RF and the base station antenna.
3.5.2 Water Proofing Antenna Connections
Waterproof all outdoor coax connectors using a three layer sealing process of initial layer of
adhesive PVC tape, followed by a second layer of self-vulcanizing weatherproofing tape such as
3M 23 (order # 1000-2314), with a final layer of adhesive PVC tape (see Figure 3-4).
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Figure 3-4: Water Proofing Antenna Connections
3.5.3 System Grounding
Direct grounding of the ST-48 enclosure via a good electrical connection to a well designed
grounding system is essential. This will protect your system, reduce the damage that can occur
during lightning strikes and reduce noise.
Figure 3-3: Local Antennas (900MHZ Shown)
3.6
Smart / Simple Sensors
Sensors used with the smart sensor head (see Figure 3-5) are considered “smart” since they
include a memory device that uploads sensor information to the GASMAX IIx anytime a new
sensor is installed. The GASMAX IIx may also accommodate other industry standard “simple”
electrochemical toxic / oxygen sensors, without the memory device, by accepting their wiring into
TB2 of the Display Assembly (see Figure 3-4). Sensor heads with the 8-wire Smart Sensor cable
connects to S2 of the 10-0291 Radio Assembly (see Figure 3-4). This unique Smart Sensor
Interface may be used to configure smart sensors and / or GASMAX IIx’s from a PC rather than
entering all variables via the magnetic keypad.
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GASMAX IIx Wireless Monitor Instruction Manual
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GASMAX IIx BRIDGE/RF Sensor Transmitters may accept either electrochemical sensors
or bridge sensors but wiring terminates differently for each. Smart & simple
electrochemical sensor wiring connects to the back of the Display assembly as shown in
Figure 3-4. Smart & simple bridge sensor wiring connects to the I/O board as shown in
Figure 2-2.
Figure 3-4: Display Assembly with 10-0291 RF PCB
Figure 3-5: 10-0247 Smart Sensor Head Assembly
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Smart Sensors are automatically recognized by the GASMAX IIx. The Smart Sensor
identification screen in Figure 3-6 is shown after power-up, upon installation of a new smart
sensor or by viewing INPUT type in the SENSOR SETTINGS / INFO menu (section 5-5).
SMART SENSOR
Type:
Cat-Bead
Span:
100
Zero:
0
SN:
xxxxxx
Born On:
01/28/04
Last Cal:
04/05/04
ANY key to Exit
ERROR CODE 01
Incorrect Sensor
installed. Install
correct sensor or
update transmitter.
SEE MANUAL
EDIT key to update.
Any other to abort.
If installed sensor
type does not match
transmitter database
Figure 3-6: Smart Sensor Info / ERROR Screens
3.7
I/O Board Wiring Installation
Connect 10-30 VDC between terminals 1 & 4 of TB2 (+ wire on 1 and 0V wire on 4) as shown in
Figure 3-7. Wireless models also transmit a sourcing 4-20mA output (electrochemical sensor
output on TB2-2 and bridge sensor outputs on TB2-3).
Instructions:
Unscrew the cover on the GASMAX IIx explosion-proof enclosure. Loosen the 2 thumbscrews
holding the display assembly and remove it. A small ribbon cable is attached with sufficient
length to allow access to the I/O PCB mounted in the bottom of the enclosure (Figure 3-7).
Power and signal connections are to TB2 where 24 VDC, Signal and Common wires must be
connected. A blocking diode protects the GASMAX IIx if polarity of the power supply is reversed
but it will not operate. Reassemble the GASMAX IIx. Follow the procedures and
recommendations in the receiver and power supply manuals to complete the installation. Be sure
the GASMAX IIx enclosure and conduit are properly grounded. Apply power and the GASMAX
IIx should function. Proceed to section-4.
Figure 3-7: 10-0233 I/O Power Supply / 3-Wire 4-20mA Assembly
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3.8
GASMAX IIx 900MHZ / 2.4GHZ RF MODULES
The GASMAX IIx monitor radio module mounts “piggy back” to the back of the Display assembly
as shown in Figure 3-8. The module’s MMCX RF connector connects to the antenna fitting’s
pigtail coax cable. GASMAX IIx Bridge models have a ribbon cable connecting to the 10-0233
I/O PCB.
Figure 3-8: 10-0291 900MHZ / 10-0325 2.4GHZ RF Modules
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SECTION 4 – INITIAL START-UP
4.1
“Xmitter Config” Configuration Menu
Figure 4-1shows how to access the menu for setting the input type (if necessary). To access
from any data display, press and hold the NEXT key for 5-seconds until the screen appears
requesting a special key sequence (4-UP keystrokes). Input should be set for “Bridge” when
connecting bridge sensors such as catalytic bead, infrared and PID, and should be set to
O2/TOXIC if using oxygen or toxic electrochemical sensors. Under normal conditions this setting
should remain at factory default.
Figure 4-1: Transmitter Configuration Menu
4.2
Initial Bridge Sensor Monitor Start-Up
GASMAX IIx Monitors that are factory equipped with a local Simple or Smart Bridge Sensor rarely
require adjustments, other than routine calibrations, to provide accurate readings. However, after
installation the following checks should be performed to insure proper operation. In addition,
alarm levels, Measurement Name ASCII fields and other variables may require configuration by
users in order to best serve their application.
4.2.1 Initial Bridge Sensor Monitor “Sensor Volts” Check
CAUTION: Sensor Volts in excess of the rated values may destroy the sensors.
Section 7.2 describes reading and setting “sensor volts” using the GASMAX IIx LCD. The voltage
displayed on the LCD is monitored across TB1-REF and TB1-ACT on the GASMAX IIx I/O board
(Figure 2.2) and may be confirmed with a voltmeter. This TB-1 value is correct for locally
mounted sensors only. Sensors mounted more than a few feet away from the GASMAX IIx may
receive a lower voltage due to the inherent voltage drop across sensor wiring. Remote mounted
sensors must have their sensor voltage (across ACTIVE and REFERENCE beads) measured AT
THE SENSOR end of the cable. The GASMAX IIx setting will require a higher value in order to
achieve the correct voltage at the sensor. Correct sensor voltage should be confirmed after startup for locally and remotely mounted bridge sensors.
4.2.2 Initial Bridge Sensor Monitor “Balance” Check
Bridge sensors may require a balance adjustment after installation especially when the sensor is
remote mounted from the GASMAX IIx. Section 7.2 describes using the LCD to read and adjust
BALANCE settings. Correct BALANCE setting should be confirmed after start-up for locally and
remotely mounted bridge sensors.
4.2.3 Initial Bridge Sensor Monitor “Span” Check
Prior to the initial Routine Sensor Calibration described in section 4.1, a coarse SPAN gas
reading verification should be performed after installation. After correct Sensor Volts and
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BALANCE have been verified, apply an upscale gas value such as 50% LEL to the sensor. The
indicated value should read between 35 and 65% LEL with 50% LEL gas applied. Larger errors
may indicate incorrect sensor wiring or defective sensor. Remember that this is only a coarse
check and precision calibrations are performed in Routine Sensor Calibrations described in the
following section 4.1. Section 6.4 describes PREAMP GAIN adjustments that may be required if
full-scale ranges are changed.
4.3
Initial Toxic / Oxygen Monitor Start-Up
GASMAX IIx Monitors that are factory equipped with a local Simple or Smart electrochemical
sensor, rarely require adjustments (other than routine calibrations) to provide accurate readings.
However, after installation the following checks should be performed to ensure proper operation.
In addition, alarm levels, Measurement Name ASCII fields and other variables may require
attention by users in order to best serve their application.
4.3.1 Initial Toxic / Oxygen Monitor “Span” Check
Prior to the initial Routine Sensor Calibration described in section 5.1, a coarse SPAN gas
reading verification should be performed after installation. Apply an upscale gas value of at least
25% of full scale to the sensor. For example, if 0-100ppm H2S is the measurement range, apply
at least 25ppm but not more than 100ppm. The indicated value should read within 15% of full
scale of the applied gas value. Remember, this is only a coarse check and precision calibrations
are performed in Routine Sensor Calibrations described in the following section 5.1. Section 7.3
describes PREAMP GAIN adjustments that may be required if full-scale ranges are changed.
SECTION 5 –ROUTINE OPERATING INSTRUCTIONS
5.1
CAL MODE - Routine Sensor Calibrations
Calibration is the most important function for ensuring correct gas readings. The CAL MODE
(flow chart shown in Figure 5-2) is designed to make calibration quick, easy and error free. A
successful ZERO and SPAN calibration requires only four keystrokes. CAL MODE is always
followed by an adjustable CAL PURGE time period (see section xxx). CAL PURGE holds the
output value at a level to prevent alarms being tripped by the upscale span gas.
The GASMAX IIx’s wireless 10-bit output range is 200 to 1000 counts for 0 to 100% of full scale.
It indicates CAL MODE by transmitting 75 counts (-15.6% FS) to receivers on the network. Toxic
gas ranges transmits 200 counts (0% FS) during the subsequent CAL PURGE delay to prevent
external alarms during calibration. NOTE: To prevent activating A1 & A2 low trip alarms at the
controller, oxygen ranges transmit 884 counts (20.9% oxygen reading) upon entry into CAL
PURGE. CAL MODE automatically exits if no keystrokes are detected after 5 minutes.
Follow these GASMAX IIx calibration guidelines:
•
•
•
•
•
•
Calibration accuracy is only as good as the calibration gas accuracy. R. C. Systems
recommends calibration gases with NIST (National Institute of Standards and
Technology) traceable accuracy to increase the validity of the calibration.
Do not use a gas cylinder beyond its expiration date.
Calibrate a new sensor before use.
Allow the sensor to stabilize before starting calibration (approximately 5 minutes).
Calibrate on a regular schedule. (R. C. Systems recommends once every 3 months,
depending on use and sensor exposure to poisons and contaminants.)
Calibrate only in a clean atmosphere, which is free of background gas.
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Figure 5-1: Calibration Gas Input
Use the following step-by-step procedure to perform ZERO and SPAN calibrations.
1. To enter the CAL MODE from the data displays, press the DOWN / CAL key and within 5
seconds press the EDIT key. Note: During CAL MODE, 75 counts (-15.6% FS ) is
transmitted to listening receivers and signifies “CAL MODE”. This special value is used
to inhibit alarm trips at the receiver.
2. Using the Cal-Cup, apply a clean ZERO gas or be sure there is no background target gas
in the monitored area. After the reading is stable, (approximately 1 minute) press the
EDIT key to perform a ZERO calibration.
3. If the ZERO calibration is successful, press the NEXT key to proceed to the SPAN check.
4. Apply the correct SPAN gas at .5 liters/min. After the reading is stable, (approximately 1
minute) press the EDIT key to perform a SPAN calibration.
WARNING: The SPAN gas used must match the value specified since this is what the
GASMAX IIx will indicate after a successful SPAN calibration. The Cal Span Value may
be edited if it becomes necessary to apply a different gas concentration (see Cal Span
Value in section 6.3).
5. If the SPAN calibration is successful, the display flashes “REMOVE CAL GAS” and starts
the CAL PURGE delay (see section 6.6). Note: During CAL PURGE, toxic monitors
transmit 0% FS to listening receivers to prevent alarms by residual upscale SPAN values.
Oxygen monitors transmit a 20.9% oxygen reading during CAL PURGE because 0% FS
would trip low oxygen alarms.
6. CAL MODE is complete after the end of the CAL PURGE delay.
The flow chart in Figure 5-2 illustrates the above procedure from left to right. UP, CAL, NEXT &
EDIT labels indicate keystrokes using the magnetic wand. The CAL MODE information screen
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(top of the chart) is available for advanced users to see Offset / Gain calibration constants and
live analog to digital converter (A/D) counts. Span Gas calibration values may also be edited
from this screen. Holding the UP key, for 5 seconds during CAL MODE, displays this screen.
Calibration history records are logged and may be viewed in the Sensor Information menu (see
section 6-5).
live reading/Eunits
Counts
= xxxxxx
Cal Span Value=xxxxxx
EDIT=Set Span Value
Offset = xxxx
Gain = xxxx
PGA = xxxx%
CAL MODE info screen
(use to change SPAN GAS value
and to see Offset / Gain constants)
NEXT = Return to Cal
Hold UP key 5 sec.
Hold UP key 5 sec.
Back to DATA
DISPLAY
DATA DISPLAY
2
% LEL
Measurement Name
CAL, then EDIT Apply ZVAL
Eunits
Apply SVAL
NEXT
Eunits
NEXT KEY
live reading/eunits
live reading/eunits
EDIT to Set ZERO
EDIT to Set ZERO
NEXT=SPAN CAL Mode
NEXT=EXIT CAL Mode
EDIT
(If ZERO Cal Fails)
ERROR CODE 4
0
% LEL
Measurement Name
EDIT
(If ZERO Cal OK)
(If SPAN Cal Fails)
show for 5 seconds
REPEAT CAL
ZERO FAIL
REMOVE
CAL GAS
(If SPAN Cal OK)
show for 5 seconds
REPEAT CAL
SPAN FAIL
ZERO CAL
Successful
SPAN CAL
Successful
ERROR CODE 5
Sensor
Life
Figure 5-2: Cal-Mode Flow Chart and Menus
5.2
ALARM OPERATION
GASMAX IIx monitors have front panel LED indicators for Alarm 1, Alarm 2 and FAIL.
Alarm LED’s only flash during alarm events to conserve battery life. “Low Battery” is indicated by
an icon on the LCD and by flashing the FAIL led. ALL ALARM CONDITIONS EXCEPT FOR
LOW BATTERY AND FAULT INCREASE WIRELESS TRANSMISSIONS TO EVERY 6SECONDS!
5.2.1 ALARM 3 – UNDERSTANDING FAULT / LEVEL OPERATION
The “A3” alarm is typically dedicated to FAIL conditions indicating sensor failures or “out of
measurement range” conditions. However, some applications require a third level alarm. The A3
menu is identical to A1 & A2 and may be set to trip at an upscale level value. A3 WILL ALSO
TRIP WITH MISSING OR FAILED SENSORS REGARDLESS OF THE LEVEL VALUE!
CAUTION: Missing or failed sensors always trip the FAIL alarm. A3 and FAIL alarm conditions
DO NOT cause the radio transmission rate to increase to 6-seconds.
SECTION 6 – SETUP MENU CONFIGURATION
6.1
Menus Database Configuration
All GASMAX IIx configuration variables are stored in its non-volatile menu database. Upon
installation, many menu items will contain default values from the factory and require changes to
better match a user’s particular application. GASMAX IIx menus may be configured from the
magnetic keypad in just a few minutes per transmitter. For installations consisting of many
points, a USB Interface device is offered to allow Smart Sensors, or the GASMAX IIx monitor to
be configured from a PC’s USB port. This is useful when GASMAX IIx units have not yet been
installed or if a portable computer may be carried to each unit.
The GASMAX IIx configuration menus tree is shown in Figure 6-1.
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Figure 6-1: Configuration Menu Tree
6.2
Configuration Using the Magnetic Wand:
Passing the magnetic wand over the EDIT key, from either data display, displays EC INPUT
PAGE 1 setup screen as shown in Figure 6-2. The UP / DOWN keys maneuver the pointer while
EDIT enters sub-levels of menu items. All SETUP menu items have at least one page of submenus. Items with sub-menus are indicated by the > symbol (right hand pointing arrow) at the
end of each line. Edit menu items by pointing to them, press the EDIT key to display the cursor,
press UP / DOWN to change that character, press NEXT to move the cursor, then press EDIT
again to load the new item and remove the cursor. Press NEXT to reverse out of the sub-menu.
To view EC INPUT PAGE 2, press the DOWN key with the pointer aimed at the bottom item on
PAGE 1.
Figure 6-2: Setup Menu Entry
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6.3
System Configuration Menus:
The System Config. group consists of two pages of menus as shown in Figure 6-3. Each menu
item’s description follows in this section.
Figure 6-3: System Config. Menus
•
User Info may be edited to contain virtually any 16-character ASCII field. It is typically
used to describe the monitored point by user tag # or other familiar terminology.
•
Eunits (engineering units) may have up to a 10 character ASCII field. Many common
gases have pre-configured Eunits based upon the sensor type and each may be edited in
this menu as described in Configuration Using the Magnetic Wand section 5-2.
•
Zero (0%) defines the reading to be displayed when 4mA (0%) is the GASMAX IIx
output.
•
Span (100%) defines the reading to be displayed when 20mA (100%) is the GASMAX
IIx output. The highest reading allowed is 9999 includes negative polarity sign and one
decimal point. Polarity is only indicated for negative readings.
•
Decimal Points sets the resolution of the LCD readings and may be for 0, 1 or 2.
Example: ZERO readings for 0, 1 & 2 DP’s respectively are 0, 0.0 & 0.00.
•
Cal Span Value sets what upscale value must be applied when performing Span
calibrations.
•
Readout Deadband allows forcing low values to continue to read zero. This is
useful when there are small amounts of background gases that cause fluctuating
readouts above zero. The highest amount of deadband allowed is 5%.
•
Track Negative, set to NO, causes negative values to read the Zero (0%) value in
data displays. The CAL MODE readout displays negative values regardless of this
setting and negative values below the Fault set point will still cause the Fault alarm to trip.
The gas value’s 200-1000 counts output always locks at 200 counts when the reading is
negative.
•
Backup Config. allows users to store the entire current GASMAX IIx menu database
into non-volatile memory for restoration later if incorrect values are accidentally entered
or uploaded.
•
Restore Config. restores the GASMAX IIx menu database to the values from the
most recent Backup Config. This menu item is only available if a smart sensor is not
installed. The special keystroke sequence of 4 consecutive UP keys is also required to
perform backup and restore operations.
•
Upload Sensor Data allows manually uploading the entire smart sensor database to
the GASMAX IIx from the smart sensor. This menu item only appears if a smart sensor
is connected.
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6.4
Alarm Settings:
The Alarm Settings page has the Alarm 1, 2, 3 Setups and Event Log submenus shown in
Figure 6-4. Alarm 1, Alarm 2 and Alarm 3/Fail menus are identical and therefore described only
once in this section. Alarm conditions are indicated by A1, A2, A3 LCD icons and by flashing the
A1, A2 and FAIL led’s. The Event Log time and date stamps significant events such as power
applied, alarm trips sensor faults and wireless INRange / Out of Range conditions. The wireless
range icon changes to
after an Out of Range and subsequent return to InRange event. It may
be reset to normal with the Reset Range Icon menu.
Figure 6-4: Alarm Settings Menus
•
Set Point enters the engineering unit value where the alarm trips. It may be negative
and trip when monitored values fall out of range in this direction. A3 has a default
negative 5% of range Set Point with Low Trip set for YES. This makes it function as a
FAULT alarm and trip when the monitored value is more than 5% “out of range”.
•
Dead-Band has a minimum value of 1% and a maximum value of 10%. It is useful for
preventing alarm cycling when the monitored value is hovering around the set point.
EXAMPLE: With a range of 0-100 ppm, if Dead-Band equals 5% and the set point is 20
ppm, after tripping at 20 ppm the value must drop below 15 ppm to reset.
•
ON Delay allows entering a maximum 10 second delay before this alarm becomes
active. This is useful for preventing nuisance alarms caused by brief spikes beyond the
set point.
•
OFF Delay allows entering a maximum 120 minute delay before clearing an alarm after
the alarm condition is gone. This is useful for continuing an alarm function, such as
operation of an exhaust fan, for a period of time after the alarm condition clears.
•
Low Trip set to YES causes the alarm to trip as the value falls below the set point.
•
Latching set to YES causes the alarm to remain active even after the condition is gone
and only reset when the UP / RESET key is pressed from a data display.
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6.5
Sensor Information:
Sensor Information has the SENSOR SETUP/INFO menus shown in Figure 6-5
SENSOR
SETTINGS/INFO
Install Sensor
>
Recall Cal History >
>
Input Type SMART
New Sensor 01/28/04
Recent Cal 04/05/04
Sensor Life
EDIT
INSTALL
NEW
SENSOR
EDIT to install
New Sensor.
Any other
to Exit.
INSTALL
EDIT
key
NEW
SENSOR
Historical CAL data
Will be Deleted.
EDIT to Accept
NEXT to Abort
CALIBRATION DATES
Record 22 of 22
CAL Date: 04/05/04
UP/DOWN to scroll
NEXT to EXIT.
SMART
Type:
Span:
Zero:
SN:
Born On:
Last Cal:
ANY key
SENSOR
Cat-Bead
100
0
xxxxxx
01/28/04
04/05/04
to Exit
Figure 6-5: Sensor Information Menus
Install New Sensor should always be performed when a new simple sensor is installed. This
deletes historical CAL data and sets sensor life to 100% after initial calibration of the new simple
sensor. The GASMAX IIx Smart sensor interface will automatically detect new smart sensors and
this menu is therefore not available with a smart sensor connected.
Recall Cal History recalls each successful calibration. These dates may be reviewed by
scrolling with the UP / DOWN keys.
Input Type indicates what kind of input or sensor the GASMAX IIx is configured to accept and is
typically pre-configured at the factory. There are three Input Type possibilities consisting of
simple EC negative, simple EC positive and Smart. Smart sensors upload sensor type and other
data to the GASMAX IIx and may be viewed on the SMART SENSOR information screen.
New Sensor displays the date when a new sensor was last installed.
Recent Cal displays the most recent calibration date.
6.6
Clock / Warm-Up & Cal Purge Delays SETUP:
Since the GASMAX IIx is equipped with a Real Time Clock & Calendar Time and Date must be
set to correctly match its location. They are set at the factory in a 24 hour format but may require
adjustment to match the location’s time & date after shipment. Follow the procedure in
Configuration Using the Magnetic Wand in section 6.2.
Warm Up and Cal Purge time delays are also available to prevent unwanted alarm trips. Figure
6-6 shows the menu for these items.
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CLOCK/DELAY SETUP
Time
12:35:42
Date
04/22/04
Warm Up Sec
120
Cal Purge Sec
100
Figure 6-6: Clock & Calendar / Delay Timer Menu
6.7
COMMUNICATIONS SETUP:
The Communications menu provides access to RADIO SETUP menus described below. Hop
Channel and System ID settings must match these settings in the Server. Remote ID must be
unique to each GASMAX IIx. Items tagged with an asterisk affect power consumption and may
have significant affects upon battery life.
Figure 6-7: Radio Setup Menu
•
Hop Channel may be set from 1-32 and assigns the pseudo-random radio frequency
hopping pattern. A transceiver will not go In Range of or communicate with a transceiver
operating on a different Hop Channel. Different hop channels can be used to prevent
radios in one network from listening to transmissions of another. Installations having
more than one Server network should also have different hop channels for each network.
2.4GHZ variation: Hop channels on 2.4 GHZ models may be set between 0 and 39.
Hop channels 0-19 includes EU “low band” frequencies 2406 – 2435MHZ. Hop
channels 20-39 includes EU “high band” frequencies 2444 – 2472MHZ.
IMPORTANT!! EXPLORE WHAT FREQUENCIES ARE APPROPRIATE FOR THE
FINAL LOCATION OF ANY WIRELESS SYSTEM.
•
Remote ID may be set from 1-255 and acts as the “RTU” address for this particular
GASMAX IIx. Controller channels receiving this monitor’s data must also be configured
with this matching Remote ID address.
•
System ID may be set from 1-255 and is similar to a password character or network
number and makes network eavesdropping more difficult. A transceiver will not go In
Range of or communicate with a transceiver operating on a different System ID.
•
*TX Multiples allows up to 5 consecutive repeats of EVERY transmission. The
default setting of 1 should only be increased if there is no other way to improve
communications success. Power consumption increases with radio transmissions and
battery life will be affected by raising the TX Multiples setting.
•
*TX Mode affects the way RF transmissions are made by the GASMAX IIx. This menu
may be set for BROADCAST (default) or AUTO DESTINATION. AUTO DESTINATION
should be used only when transmitting to a single receiving server. Since AUTO
DESTINATION creates an “acknowledge” hand shake returned from the receiver, only
one receiver is allowed to avoid data collisions of the “acknowledge” signal. If an
“acknowledge” is not received by the GASMAX IIx it transmits repeatedly up to 16 times.
BROADCAST may be used for any application but is required when transmitting to a
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Server and other Client radios. BROADCAST always transmits the packet 4 times and
does not require any “acknowledge” returned by the receivers.
•
*TX Power (900MHZ models only) may be set for 10mW, 200mW, 400mW and 1 watt.
If the GASMAX IIx monitor is battery or solar powered, the TX Power setting should be
set as low as possible to sustain reliable communication. The maximum TX Power
setting is 30db (1 watt). Each time TX power is reduced by half, antenna transmit power
is reduced by 3dB.
2.4GHZ variation: The TX Power menu is not available in 2.4GHZ models and the
power level is fixed at 50mW.
•
TX Verbose should be set to NO for normal operation. YES entries cause the
GASMAX IIx to transmit additional information that may be used in future products.
•
Radio Status opens a page indicating if the GASMAX IIx is In-Range of the Server. A
reading on this page displays the internal 3.3V power supply value.
* TX Multiples, TX Mode and TX Power menu settings are available to improve communications
reliability by increasing the quantity and power of wireless transmissions.
IMPORTANT! Ensure proper selection and location of antennas before increasing TX Multiples
and TX Power settings! Battery life will be reduced by increasing these settings. Proper
selection and location of antennas contributes much more to successful communications, without
sacrificing battery life, than these settings.
6.7.1 GASMAX IIx Operation with C1 Protector Controllers
Figure 6-8 shows correct settings for the C1 Protector base station’s “Data From” menu to
receive data from GASMAX IIx monitors.. Each C1 channel’s Remote ID must match the
GASMAX IIx Remote ID setting (see section 6.7) in order for its VALUE to appear on the desired
C1 channel. During normal operation, the GASMAX IIx digital output value equals 75 counts, or
minus 15.6%, during CAL MODE. Enabling the C1 Protector’s “INPUT MARKER” menu as
shown on the right menu in Figure 6-8 causes the C1 to indicate “IN CAL” when the GASMAX IIx
CAL MODE activated.
When Input Req is set for VALUE, this C1 channel reads the GASMAX IIx monitored gas value.
If Input Req is set for BATT, the C1 channel reads the battery voltage from the GASMAX IIx with
the same Remote ID. To properly display the GASMAX IIx battery voltage, the C1’s engineering
unit range should be set to 0-5.00 VDC. Even if this channel reads VALUE from the GASMAX
IIx, the battery voltage is displayed at the bottom of this C1 menu as shown in Figure 6-8.
Figure 6-8: C1 Protector Base Station “Data From” Menu
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6.7.2 GASMAX IIx Operation with C2 Quad Protector Controllers
FIGURES 6-9 and 6-10 show correct settings for a C2 Quad Controller to receive data from
GASMAX IIx monitors.
Figure 6-9
C2 Quad controllers must have their Communications menus set for Wireless Receiver mode as
shown in Figure 6-9. In Receiver mode the C2 Quad may have 1-4 channels configured to
receive input data from 1-4 GASMAX IIx sensor transmitters.
Channel input type is configured in the ANALOG SETUP menu located within the Input/Output
Setup menus as shown in Figure 6-10. GASMAX IIx monitors transmit 200 counts for 0% and
1000 counts for 100% full scale readings, so Input Min/Max menu values should be set for 200 &
1000. The Remote Xmitter ID menu entry must match the Remote ID address setting in the
GASMAX IIx providing data to this C2 Quad Controller channel. The voltage level of the 3.6 volt
lithium battery and the most recent A/D Counts value are displayed at bottom of the screen.
Figure 6-10
6.8
SYSTEM SECURITY:
The SYSTEM SECURITY menu in Figure 6-11 offers two levels of protection. A LOW level
allows CAL MODE sensor calibrations but requires the 4-digit Pass Code prior to altering menus.
HIGH level locks the entire menu database and CAL Mode until the correct Pass Code is
entered. LOW and HIGH security levels always allow viewing of configuration menus but they
may not be changed. Contact Name is a 12 character ASCII field available for displaying a
phone # or name of personal who know the Pass Code. Lost Pass Codes may be recovered by
entering the locked security menu and holding the UP key for 5 seconds. The 4-digit code
appears near the bottom of the screen.
SYSTEM SECURITY
Contact Name
Secure Level LOW
Pass Code
Unlocked
Figure 6-11: System Security Menu
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6.9
LCD Contrast Adj:
LCD Contrast Adj. may be set for optimum viewing using the menu shown in Figure 6-12.
CONTRAST
UP/DOWN to change
NEXT to EXIT
Figure 6-12: LCD Contrast Adjust Menu
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SECTION 7 – TECHNICIANS ONLY MENUS
7.1
Introduction:
WARNING! Users of these menus must have a detailed understanding of their functions.
Monitoring of target gases, processing of alarms, wireless communications should not be relied
upon while editing these menus! Back-up the current configuration prior to altering any Technical
menus in case Restore is required later (see section 6.3).
The TECHNICIAN ONLY menu group in Figure 7-1 contains items that are factory configured
depending upon the type sensor input connected to the GASMAX IIx BRIDGE/RF. They should
not be tampered with after installation. If configured incorrectly, some items will prevent
monitoring of target gases. Access requires a special key sequence of four consecutive UP
keystrokes to prevent accidental modification of critical items.
Figure 7-1: Technicians Menu Tree
7.2
Set Balance / Set Sensor Voltage (Technicians only!):
Set Balance and Set Sensor Voltage are used when Input Type is for Bridge sensors. They
are factory configured and only require field adjustment if the bridge sensor is mounted remote
from the GASMAX IIx or if a new sensor is installed. Other input type entries draw a line through
these menus and they are inactive. Sensors mounted a long distance away may require the
voltage at the GASMAX IIx be higher than the sensor’s rated voltage to compensate for losses in
field wiring. Be careful not to exceed the rated voltage at the sensor’s A and R terminals.
Set Balance allows balancing of the bridge sensor and must only be performed with ZERO gas
on the sensor (Figure 7-2). Balance is similar to a very coarse ZERO calibration and does not
need to be precise since subsequent calibrations will correct for small errors. ZERO gas applied
to the sensor should provide a Reading of –3 to +3 on the SENSOR BALANCE menu.
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GASMAX IIx Wireless Monitor Instruction Manual
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Figure 7-2: Bridge BALANCE & SENSOR VOLTS Adjust Menus
7.2
Set Gain to Unity (Technicians only!):
Set Gain to UNITY allows resetting previous calibration OFFSET to zero and GAIN to one. This
is the definition of UNITY. A calibration should be performed after setting UNITY.
*****WARNING*****
Previous Calibration
will be erased.
EDIT
Gain=Unity
EDIT to confirm.
NEXT to exit.
Figure 7-3: Set UNITY GAIN Menu
7.3
PreAmp Gain Adjust (Technicians only!):
Depending upon Input Type, GASMAX IIx input signals may have a very wide range. PreAmp
Gain Set is the adjustment that matches the input signal range to the GASMAX IIx input signal
conditioning circuits. Altering the PreAmp Gain setting automatically resets previous calibration
OFFSET & GAIN values to UNITY as described in section 7.3.
If it is determined the PreAmp Gain value is incorrect, apply the desired up-scale input and use
the UP / DOWN keys to obtain the correct Reading value. Counts are the 10-bit binary A/D
value with an active range value of 0 - 1023.
CAUTION: For standard installations, this is a factory adjustment. Do not use the PreAmp Gain
Set menu for calibrating sensors. It should only be adjusted if a new measurement gas or input
range is required.
PGA Setup
Gain
25.0%
Counts
1011
Reading
100
Up/Dn to Change.
Next to exit.
Figure 7-4: PreAmp Gain Adjust (PGA) Menu
7.4
Simple Sensor Input Type (Technicians only!):
Smart sensors automatically configure Input Type. Simple inputs must be configured manually
using the Input Type menu. Input Type configures GASMAX IIx hardware to accept positive or
negative coefficient electrochemical sensors. Positive / Negative coefficient electrochemical
sensors have several gas types available within each group (see table below). Biased EC
sensors require factory installed solder bridge SB1 on the Display Assy PCB - see Addendum 3.
After selecting Input Type, a SELECT EUNITS screen indicates the default engineering units for
this sensor. These EUNITS may be accepted by pressing the EDIT key, or changed by moving
the pointer to [Custom] and editing as described in Configuration Using the Magnetic Wand in
section 6-2.
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Figure 7-5: “Simple” Sensor Input Type Selection Menu
Coefficient
Negative
Negative
Negative
Negative, Bias
Negative, Bias
Negative
Negative
Negative
Negative
Negative
Negative
Negative
Negative
Negative
Negative
Positive
Positive
Positive
7.5
Electrochemical Sensor Type
Hydrogen Sulfide
Oxygen
Carbon Monoxide
Ammonia
Nitric Oxide
Ethylene Oxide
Hydrogen Chloride
Hydrazine
Arsine
Sulfur Dioxide
Hydrogen
Hydrogen Cyanide
Phosgene
Phosphine
Hydrogen Fluoride
Nitrogen Dioxide
Ozone
Chlorine
Default EUNITS
ppm H2S
% Oxygen
ppm CO
ppm NH3
ppm NO
ppm Eth O2
ppm HCL
ppm N2H4
ppm Arsine
ppm SO2
ppm H2
ppm HCN
ppm COCl2
ppm PH3
ppm HF
ppm NO2
ppm Ozone
ppm Cl2
Zero Cal Value (Technicians only!):
The Zero Cal Value menu entry allows the zero calibration value to be set for something other
than a zero reading. In rare cases it may be necessary to perform Zero calibrations at some
other engineering unit reading than zero. Do not exceed 25% of full scale.
7.6
Raw Min / Max Counts (Technicians only!):
The Raw Min / Max Counts menus determine the range of 10-bit analog to digital (A/D)
converter counts that define 0 & 100% of full scale. Raw Min A/D counts create 0% readings and
Raw Max A/D counts create 100% readings. The corresponding Zero 0% and Span 100%
readings are entered in the Configuration Menu describe in section 6.3. Live A/D count values
may be viewed from the CAL MODE Information screen described section 5.1.
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