Operation and Maintenance Manual

Operation and Maintenance
Manual
GASMAX CX Single / Dual Channel Gas Monitor
GDS Corp.
2513 Hwy 646 Santa Fe, Texas 77510
409-927-2980 409-927-4180 (Fax) ww.gdscorp.com
GASMAX CX Operation & Maintenance Manual, Revision 1.0
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
D’UTILISER, D’ENTRETENIR OU DE RÉPARER L’ÉQUIPEMENT.
REVISION HISTORY
Revision 1.0
4/15/14 Initial Release
Copyright © 2014 GDS Corp. All Rights Reserved
P/N 1200-0872-01
Page 2
ENTIER
AVANT
GASMAX CX Operation & Maintenance Manual, Revision 1.0
CONTENTS
1
SAFETY INFORMATION _______________________________________________ 7
2
OVERVIEW _________________________________________________________ 8
3
HARDWARE ________________________________________________________ 9
4
INSTALLATION _____________________________________________________ 10
Selecting a Location _________________________________________________________ 10
Explosion Proof Installation ___________________________________________________ 10
Intrinsically Safe Installation __________________________________________________ 10
Mounting the GASMAX CX Instrument Enclosure _________________________________ 10
Connecting DC Power & Output Signal Wiring ____________________________________ 11
Connecting to an Ethernet Network ____________________________________________ 12
Optional Relay / MODBUS Interface ____________________________________________ 12
Optional MODBUS Junction Box _______________________________________________ 13
Local Smart Toxic sensor _____________________________________________________ 15
Connecting a Remote Toxic Sensor transmitter ___________________________________ 16
Local Smart Bridge Sensor ____________________________________________________ 17
Connecting a Remote INFRARED Sensor transmitter _______________________________ 18
Local GDS-IR Infrared Sensor __________________________________________________ 19
Connecting a Remote GDS-IR Infrared Sensor ____________________________________ 20
Connecting an External 4-20mA Input Device_____________________________________ 21
5
SETUP AND OPERATION _____________________________________________ 22
GASMAX Controls and DIsplay ________________________________________________ 22
Display Screens_____________________________________________________________ 23
Initial Setup _______________________________________________________________ 24
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GASMAX CX Operation & Maintenance Manual, Revision 1.0
Normal Operating Mode _____________________________________________________ 24
Alarm Operation – ALARM 1, 2 and 3 ___________________________________________ 24
Alarm Operation – FAULT ____________________________________________________ 25
6
CALIBRATION ______________________________________________________ 26
Calibration Overview ________________________________________________________ 26
Calibration Procedure _______________________________________________________ 27
7
MAINTENANCE _____________________________________________________ 29
Normal Maintenance ________________________________________________________ 29
Sensor Replacement – Local Sensors____________________________________________ 29
Sensor Replacement – Remote Sensors _________________________________________ 30
8
TROUBLESHOOTING_________________________________________________ 32
Toxic Sensor Indicates Fault or Overrange _______________________________________ 32
Toxic Sensor Will Not Calibrate ________________________________________________ 32
Bridge Sensor Indicates Fault or Overrange ______________________________________ 32
Bridge Sensor Will Not Calibrate _______________________________________________ 32
Receiving Device and GASMAX Displayed Values Don’t Match _______________________ 33
Controller MODBUS Data Incorrect _____________________________________________ 33
Controller Showing MODBUS COMM ERROR _____________________________________ 33
GASMAX Display Blank ______________________________________________________ 33
Software reset (“Cold Boot”) __________________________________________________ 33
9
SPECIFICATIONS ____________________________________________________ 34
10
USER MENUS ____________________________________________________ 35
Alarm Outputs Menu ________________________________________________________ 36
Channel Settings Menu ______________________________________________________ 37
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GASMAX CX Operation & Maintenance Manual, Revision 1.0
Comm Settings Menu ________________________________________________________ 39
System Settings Menu _______________________________________________________ 40
Diagnostics Menu ___________________________________________________________ 41
11
NETWORK INTERFACE _____________________________________________ 42
MODBUS Registers __________________________________________________________ 42
12
SPARE PARTS ____________________________________________________ 50
Sensor Head Accessories _____________________________________________________ 51
13
DRAWINGS AND DIMENSIONS ______________________________________ 52
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GASMAX CX Operation & Maintenance Manual, Revision 1.0
TABLE OF FIGURES
FIGURE 3-1 GASMAX CX GAS MONITOR .................................................................................................... 9
FIGURE 4-1: GASMAX CX I/O POWER & SIGNAL WIRING .......................................................................... 11
FIGURE 4-2 ETHERNET INTERFACE .......................................................................................................... 12
FIGURE 4-3 GASMAX CX OPTIONAL RELAY / MODBUS INTERFACE ........................................................... 12
FIGURE 4-4: MODBUS WIRING JUNCTION BOX ........................................................................................ 13
FIGURE 4-5: MODBUS JBOX LOCATION OPTIONS..................................................................................... 14
FIGURE 4-6: LOCAL SMART TOXIC SENSOR CONNECTION ........................................................................ 15
FIGURE 4-7: REMOTE TOXIC SENSOR TRANSMITTER CONNECTION .......................................................... 16
FIGURE 4-8: LOCAL SMART BRIDGE SENSOR CONNECTION ...................................................................... 17
FIGURE 4-9 REMOTE INFRARED SENSOR TRANSMITTER .......................................................................... 18
FIGURE 4-10: LOCAL GDS-IR INFRARED SENSOR ...................................................................................... 19
FIGURE 4-11: REMOTE GDS-IR CONNECTION........................................................................................... 20
FIGURE 4-12: REMOTE 4-20MA INPUT .................................................................................................... 21
FIGURE 5-1: GASMAX CX DISPLAY SCREEN SEQUENCE ............................................................................. 22
FIGURE 5-2 GASMAX DATA DISPLAY........................................................................................................ 23
FIGURE 5-3 GASMAX TREND DISPLAY ...................................................................................................... 23
FIGURE 6-1: CALIBRATION FLOWCHART .................................................................................................. 28
FIGURE 7-1: GASMAX SENSOR REPLACEMENT......................................................................................... 30
FIGURE 10-1: MAIN MENU TREE ............................................................................................................. 35
FIGURE 10-2: ALARM OUTPUTS MENU TREE ........................................................................................... 36
FIGURE 10-3: CHANNEL SETTINGS MENU TREE (1) .................................................................................. 37
FIGURE 10-4: CHANNEL SETTINGS MENU TREE (2) .................................................................................. 38
FIGURE 10-5: COMM SETTINGS MENU .................................................................................................... 39
FIGURE 10-6: SYSTEM SETTINGS MENU TREE .......................................................................................... 40
FIGURE 10-7: DIAGNOSTICS MENU TREE ................................................................................................. 41
FIGURE 12-1: GASMAX CX + LOCAL SENSOR SPARE PARTS ....................................................................... 50
FIGURE 12-2: GASMAX SENSOR HEAD ..................................................................................................... 51
FIGURE 12-4: GASMAX SENSOR HEAD SPLASH GUARD & FLOW CELL ....................................................... 51
FIGURE 13-1 GASMAX CX DIMENSIONS ................................................................................................... 52
FIGURE 13-2 GASMAX CX REMOTE SENSOR TRANSMITTER DIMENSIONS ................................................ 53
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GASMAX CX Operation & Maintenance Manual, Revision 1.0
1 SAFETY INFORMATION
Important – Read Before Installation
Users should have a detailed understanding of GASMAX CX operating and maintenance instructions. Use
the GASMAX CX 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
•
The GASMAX CX gas monitor described in this manual must be installed, operated and
maintained in accordance with information contained herein. Installation in any hazardous area
must comply with all applicable restrictions, requirements and guidelines for said hazardous
areas. It is the end user customer’s final decision to ensure that the GASMAX CX is suitable for
the intended use.
•
The GASMAX CX is designed and constructed to measure the level of certain gases in ambient air.
Accuracy in atmospheres containing steam or inert gases cannot be guaranteed.
•
Always mount the sensor head vertically with the sensor head facing down. However, the GDS-IR
infrared sensor may be mounted vertically or horizontally.
•
Do not paint transmitter or sensor assembly.
•
Do not operate the GASMAX CX if its enclosure is damaged or cracked or has missing
components. Make sure the cover, internal PCB’s and field wiring are securely in place before
applying power.
•
Do not expose the GASMAX CX to electrical shock or continuous severe mechanical shock.
Protect the GASMAX CX and related sensor assemblies from dripping liquids and high power
sprays.
•
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.
•
Periodically test for correct operation of the system’s alarm events by exposing the monitor to a
targeted gas concentration above the High Alarm set point.
•
Use only for applications described within this manual.
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GASMAX CX Operation & Maintenance Manual, Revision 1.0
2 OVERVIEW
The GASMAX CX is a single or dual channel fixed-point gas
monitor designed to provide continuous monitoring of toxic
or combustible gases in hazardous areas. Gas values are
displayed in calibrated engineering units as well as bar graph
or 30-minute trend graph format.
The GASMAX CX supports one or two local or remote mount
sensors for toxic or combustible gases. The advanced
microcontroller, non-intrusive magnetic interface and
superior full color graphic LCD interface offers rapid setup,
simplified operation and enhanced diagnostics not found in
previous generation products. On-board non-volatile
memory retains all configuration data during power
interruptions. Two independent 4-20 mA outputs allow for
easy connection to control systems or other alarm
instrumentation, and a built-in Ethernet port allows the GASMAX CX to be easily integrated into a facilities
network. Additional output options include 4x alarm relays and dual channel MODBUS slave interfaces.
Built-in user-prompted calibration makes it easy for one person to perform calibration and maintenance
without opening the enclosure or declassifying the area. A battery-powered real-time clock and event log
allows the GASMAX CX to track calibration and alarm events for later recall on the LCD readout.
For toxic gases the GASMAX CX supports a wide range of electrochemical (“echem”) sensors. These
sensors use chemical reactions to sense the presence of gases such as hydrogen sulfide, chlorine, sulfur
dioxide and many others. Unlike previous generation gas detectors, GASMAX CX sensors contain all the
necessary micro-electronics needed to convert the extremely low level sensor output signals into digital
values that are immune to interference and noise. When combined with state-of-the-art digital signal
processing and filtering, the GASMAX is capable of gas detecting levels lower than ever before.
For combustible gases the GASMAX CX offers three different choices. In addition to traditional catalytic
bead (“cat bead”) sensor, the GASMAX CX supports the GDS Corp SmartIR infrared sensor and GDS-IR
infrared sensor as well as the latest generation photoionization detector (PID) sensors for measurement
of volatile organic compounds such as benzene or toluene.
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GASMAX CX Operation & Maintenance Manual, Revision 1.0
3 HARDWARE
The GASMAX CX is enclosed in a CSA / FM / IECEx certified anodized aluminum explosion proof yellow
enclosure designed to protect the electronics and make it easy for workers to identify in industrial
environments. The screw-on front cover is easily removed for installation and maintenance; however,
built-in user interface magnetic switches allow operators and technicians to adjust, calibrate or
troubleshoot the GASMAX CX without declassifying the area.
Local sensors are contained in a stainless steel sensor head, typically attached to the bottom of the
GASMAX CX as shown below. The normal sensor head includes an integrated stainless steel flame arrestor
that must be removed for the detection of certain reactive gases such as chlorine or chlorine dioxide. If
removed, the GASMAX CX is not certified for use in hazardous areas.
See Chapter 13 for drawings and dimensions.
¾” NPT
Conduit
Entry (2x)
Color LCD
Display
Removable Front Cover
Sensor Head & Gas Sensor
Optional Splash Guard
Figure 3-1 GASMAX CX GAS MONITOR
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GASMAX CX Operation & Maintenance Manual, Revision 1.0
4 INSTALLATION
SELECTING A LOCATION
Factors such as prevailing winds, target gas density, potential leak sources, air movement machinery and
similar environmental variables are important when selecting a location for the GASMAX CX gas monitor
or gas sensor. Even though the GASMAX CX is designed for rugged service, sensors and electronics should
be protected from environmental damage due to water, snow, shock, vibration and dirt. In addition, the
sensor and / or display should be located such that regular maintenance and periodic sensor replacement
can be readily accomplished. While there are no industry standards for gas detector placement,
professional tools exist that can simulate leaks or spills and provide excellent guidance for locating gas
detectors throughout a facility.
EXPLOSION PROOF INSTALLATION
GASMAX CX monitors with standard explosion-proof sensor heads are certified for use in Class 1 Division
1 hazardous areas. Installation in these areas should follow best industry standard practices and all
appropriate electrical codes. Generally, these codes require rigid metal conduit, poured seals and other
installation elements necessary to ensure safety. In all cases, GDS Corp recommends any GASMAX sensor
be mounted vertically with the sensor opening facing down. If there is a possibility that water or other
liquid may be present, GDS Corp further recommends the installation of a sensor head Splash Guard (p/n
10-0205) to protect the sensor from damage. For maximum protection against RF interference or
electrical surge, the GASMAX CX enclosure, all remote sensors and interconnecting conduit must be
properly grounded.
INTRINSICALLY SAFE INSTALLATION
The GASMAX CX is not certified for use as an Intrinsically Safe device.
MOUNTING THE GASMAX CX INSTRUMENT ENCLOSURE
The GASMAX CX standard enclosure is a cast aluminum explosion-proof (NEMA 7) enclosure as shown in
Figure 4-1. Two channel GASMAX CX units with dual local sensor heads include a “Y” adapter, shown in
Figure 4-2.
The GASMAX CX or remote sensor should always be mounted with the sensor head opening facing down.
If necessary, a Splash Guard (p/n 10-0205) should be attached if there is any chance that water or liquid
spray could enter the sensor opening from below. Be sure to leave sufficient room (~ 12”) below the
sensor head to allow for ambient air circulation and easy access for attachment of a Calibration Cup and /
or removal of the sensor head cover for sensor replacement.
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GASMAX CX Operation & Maintenance Manual, Revision 1.0
CONNECTING DC POWER & OUTPUT SIGNAL WIRING
To access the GASMAX signal and power connections, remove the cover on the GASMAX CX explosionproof enclosure, loosen the 2 thumbscrews holding the display assembly and remove it. The display will
remain connected to the IO/Power Supply PCB mounted in the back of the enclosure by a short ribbon
cable. Route the power and signal wires through the conduit entry and connect to terminal block “TB1”.
Plus 24VDC connects to TB1-1. DC Ground connects to TB1-4. Channel One 4-20mA output is available on
TB1-2 and Channel Two 4-20mA output is available on TB1-3. GDS Corp always recommends using
shielded wire for signal and power cable.
TB1 – 1: +12-30VDC Input
TB1 – 2: Channel 1 4-20mA Out
TODISPLAY
TB1 – 3: Channel 2 4-20mA Out
LOCAL
SENSOR
CH2
CH1
Figure 4-1: GASMAX CX I/O Power & Signal Wiring
NOTE: THE MAXIMUM DISTANCE 4-20 MA SIGNALS CAN TRAVEL IS DEPENDENT UPON CABLE
GAUGE, DC POWER SUPPLY VOLTAGE LEVEL AND INPUT IMPEDANCE OF THE RECEIVING DEVICE.
ASSUMING A NOMINAL 24 VDC POWER SUPPLY, 100 OHM LOAD AND MAXIMUM TOTAL LOOP
RESISTANCE OF 750 OHMS:
#18GA, 0.0064 OHM/FT => 9.6 MILES / 15.5 KM
#24GA, 0.026 OHMS/FT => 2.3 MILES / 3.7 KM
Page 11
420 IN2
A/COM
C/420 IN1
R/PWR
E-NET
COM
420 OUT2
420 OUT1
PWR
TB1 – 4: Power / Signal Common
GASMAX CX Operation & Maintenance Manual, Revision 1.0
CONNECTING TO AN ETHERNET NETWORK
The GASMAX CX provides a standard 10/100 Ethernet network interface on the Power I/O board as shown
in Fig. 4-2. Both DHCP and fixed IP address modes are provided. The Ethernet interface provides access to
the MODBUS database via MODBUS/TCP as well as remote access and setup via a built-in web server.
NOTE: USER MENU CHANGES TO
NETWORK SETUP PARAMETERS
TODISPLAY
REQUIRES A DEVICE REBOOT.
420 IN2
A/COM
R/PWR
E-NET
COM
420 OUT2
420 OUT1
PWR
RJ-45 Connector
C/420 IN1
S1 – Ethernet
NOTE: STANDARD ETHERNET
CABLES WITH MOLDED STRAIN
RELIEF FITTINGS ARE NOT
RECOMMENDED DUE TO SPACE
LOCAL
SENSOR
CH2
CONSTRAINTS.
CH1
Figure 4-2 Ethernet Interface
OPTIONAL RELAY / MODBUS INTERFACE
The optional Relay / Modbus board is connected “piggyback” to the back of the GASMAX CX Display
Assembly and provides three level alarm relays, a FAULT relay (“K3”), two RS-485 Modbus RTU serial ports
and access to the Digital Input / Remote ACK port.
Remote Alarm Acknowledge
Modbus Wiring:
1 Modbus 1 A
2 Modbus 1 B
3 Shield Tie Point
4 Modbus 2 A
5 Modbus 2 B
TB2
1
2
3
4
5
A
B
S
A
B
TB1
MODBUS interface
Relay Wiring:
1 Fault 1 NC
2 Fault 1 Common
3 Fault 1 NO
4 Relay 3 NC
5 Relay 3 Common
6 Relay 3 NO
7 Relay 2 NC
8 Relay 2 Common
9 Relay 2 NO
10 Relay 1 NC
11 Relay 1 Common
12 Relay 1 NO
Figure 4-3 GASMAX CX Optional Relay / MODBUS Interface
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GASMAX CX Operation & Maintenance Manual, Revision 1.0
OPTIONAL MODBUS JUNCTION BOX
MODBUS system architecture requires that the devices in any MODBUS loop be connected in a daisychain layout. This minimizes signal reflections and improves signal noise margin. A MODBUS Termination
Jumper installs a load resistor across the MODBUS signal lines and should only be set to “A” (ON) at the
last device in the string.
Cable selection for MODBUS systems is important for both signal integrity and power distribution.
MODBUS / RS-485 transmissions use low-voltage differential signaling to achieve reasonable data rates
over very long distances, up to 4000 feet without a repeater.
For MODBUS data signals, GDS Corp recommends 20GA to
24GA twisted shielded cable. Daisy-chain power distribution
may require larger gauge wire since it is critical that the
+24
GND
“A”
“B”
supply voltage for the GASMAX CX at the far end of the string
not fall below 12VDC during power-up.
+24 GND A
PWR to
ENCLOSURE
MODBUS to
TO GASMAX CX
+24 GND A
Note that while the GASMAX CX has two sets of wiring
+24
GND
“A”
“B”
terminals for MODBUS “A” and “B” signals, daisy-chain power
wiring requires that two wires be installed in the “+24” and
“GND” terminals on the GASMAX CX I/O Power Supply board. This
can be difficult if wire sizes are larger than #18GA. For these reasons, if
MODBUS is required GDS Corp recommends the addition of the
Figure 4-4: MODBUS Wiring
Junction Box
MODBUS Wiring Junction Box (see Fig. 5-7). This option minimizes the
need to access wiring inside the GASMAX CX, provides individual wire landing points for incoming and
outgoing MODBUS and power wiring and shields, and makes it easy to temporarily disconnect the
GASMAX CX power or MODBUS connections without affecting any other MODBUS device.
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GASMAX CX Operation & Maintenance Manual, Revision 1.0
The MODBUS wiring junction box is attached to the GASMAX CX, either on the bottom fitting or one of
the side fittings, depending on installation requirements. Specify BOTTOM, LSIDE or RSIDE when ordering
(See Fig. 4-5).
“BOTTOM”
“LSIDE”
Figure 4-5: MODBUS JBOX LOCATION OPTIONS
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GASMAX CX Operation & Maintenance Manual, Revision 1.0
LOCAL SMART TOXIC SENSOR
Local Smart toxic sensors are factory installed in a sensor head directly attached to the GASMAX CX
enclosure. Local Smart toxic sensors and can be connected to either Channel 1 or Channel 2 sensor inputs
on the I/O Power Supply board as shown below.
Smart sensors are automatically recognized on power-up and upload range, calibration and production
date information to the GASMAX for use during operation and setup.
A/COM
420 IN2
R/PWR
C/420 IN1
E-NET
COM
420 OUT2
PWR
420 OUT1
TODISPLAY
LOCAL
SENSOR
CH2
CH1
Smart TOXIC sensors
can be connected to
either CH1 or CH2
Figure 4-6: Local Smart Toxic Sensor Connection
IMPORTANT: TOXIC SENSORS ARE SUBJECT TO ACCELERATED DETERIORATION IF POWER IS NOT
SUPPLIED WITHIN 3 MONTHS OF SHIPMENT FROM GDS CORP.
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GASMAX CX Operation & Maintenance Manual, Revision 1.0
CONNECTING A REMOTE TOXIC SENSOR TRANSMITTER
GASMAX CX monitors with remote-mount toxic sensor transmitters are shipped in two pieces and sensor
wiring must be installed by the end user. Remote toxic sensor transmitters connect to the Channel 1 or
Channel 2 4-20mA analog input connections on the Power I/O board as shown below.
Remote toxic sensor transmitters use industry standard 4-20mA signal levels and can therefore be
mounted at some distance from the GASMAX CX. GDS Corp recommends a maximum distance of 500 ft. /
150 m using shielded two-wire cable sized appropriately.
GDS-49 REMOTE SENSOR TRANSMITTER
GASMAX CX
A/COM
420 IN2
C/420 IN1
E-NET
R/PWR
COM
420 OUT2
PWR
420 OUT1
TO DISPLAY
LOCAL
SENSOR
CH2
CH1
Remote TOXIC sensor
transmitters can be
connected to either
CH1 or CH2
4-20mA input
Figure 4-7: Remote Toxic Sensor Transmitter Connection
NOTE: FIELD WIRING FOR REMOTE TOXIC SENSOR TRANSMITTERS IS NOT POLARIZED AND MAY BE
CONNECTED IN ANY ORDER.
IMPORTANT: TOXIC SENSORS ARE SUBJECT TO ACCELERATED DETERIORATION IF POWER IS NOT
SUPPLIED WITHIN 3 MONTHS OF SHIPMENT FROM GDS CORP.
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GASMAX CX Operation & Maintenance Manual, Revision 1.0
LOCAL SMART BRIDGE SENSOR
Local bridge-type sensors, including catalytic bead, SmartIR infrared sensors for combustibles and CO2
and photoionization detectors (PID) for volatile organic compounds are factory installed and must be
connected to the CH 1 Smart Sensor connector as shown below.
A/COM
420 IN2
R/PWR
C/420 IN1
E-NET
COM
420 OUT2
PWR
420 OUT1
TODISPLAY
LOCAL
SENSOR
CH2
CH1
LOCAL SMART BRIDGE-TYPE
SENSORS MUST BE
CONNECTED TO CH1
Figure 4-8: Local Smart Bridge Sensor Connection
NOTE: LOCAL SMART BRIDGE SENSORS AUTOMATICALLY ADJUST SENSOR EXCITATION VOLTAGE.
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GASMAX CX Operation & Maintenance Manual, Revision 1.0
CONNECTING A REMOTE INFRARED SENSOR TRANSMITTER
GASMAX CX monitors with remote-mount infrared sensor transmitter for combustibles or CO2 are
shipped in two pieces and sensor wiring must be installed by the end user. Remote infrared sensor
transmitters connect to the Channel 1 or Channel 2 4-20mA analog input connections on the Power I/O
board as shown below.
Remote infrared sensor transmitters use industry standard 4-20mA signal levels and can therefore be
mounted at some distance from the GASMAX CX. GDS Corp recommends a maximum distance of 500 ft. /
150 m using shielded two-wire cable sized appropriately.
GND
mA OUT
GDS-50 REMOTE SENSOR TRANSMITTER
PWR
GASMAX CX
A/COM
420 IN2
R/PWR
C/420 IN1
E-NET
COM
420 OUT2
PWR
420 OUT1
TODISPLAY
LOCAL
SENSOR
CH2
PW
CH1
Figure 4-9 Remote Infrared Sensor Transmitter
NOTE: FIELD WIRING FOR REMOTE INFRARED SENSOR TRANSMITTERS IS POLARIZED AND CORRECT
WIRING POLARITY MUST BE OBSERVED.
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GASMAX CX Operation & Maintenance Manual, Revision 1.0
LOCAL GDS-IR INFRARED SENSOR
When the GASMAX CX is configured to include a GDS-IR Infrared Combustible or CO2 sensor, the
IO/Power Supply board is factory modified to make Channel 2 compatible with the sensor’s 4-20mA input
signal. An integrated “zero set” pushbutton and magnetic zero switch is included inside the GASMAX CX
enclosure and is used to periodically set the zero point for the GDS-IR.
GASMAX CX with LOCAL GDS-IR SENSOR
GDS-IR INTERFACE BOARD MOUNTED
INSIDE GASMAX CX ENCLOSURE
A/COM
420 IN 2
R/PWR
C/420 IN 1
E-NET
COM
420 OUT 2
PWR
420 OUT 1
TO DISPLAY
LOCAL
SENSOR
CH 2
CH 1
USE MAGNETIC WAND TO ACTIVATE SET
ZERO SWITCH MOUNTED ON GDS-IR
INTERFACE BOARD INSIDE GASMAX CX
ENCLOSURE
Figure 4-10: Local GDS-IR Infrared Sensor
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GASMAX CX Operation & Maintenance Manual, Revision 1.0
CONNECTING A REMOTE GDS-IR INFRARED SENSOR
GASMAX CX monitors with remote-mount GDS-IR sensors are shipped in two pieces and sensor wiring
must be installed by the end user. GDS-IR sensors can be mounted up to 500 feet from the GASMAX
display. Cable used should be three-wire stranded with foil shield. GDS Corp recommends Belden B8771.
The cable shield must be connected to an earth ground at ONE END ONLY. In this configuration the zeroset pushbutton is located in the GDS-IR remote mount junction box.
A/COM
420 IN 2
C/420 IN 1
E-NET
R/PWR
COM
PWR
420 OUT 2
420 OUT 1
TB2
LOCAL
SENSOR
CH 2
CH 1
RED: +18 - 30VDC Power
BLU: 4-20mA Analog Out
CUSTOMER-SUPPLIED 4-CONDUCTOR
SHIELDED WIRING
#18 GA OR LARGER RECOMMEND
BLK: Power Common
WHT: Hardware Zero
Figure 4-11: Remote GDS-IR Connection
Page 20
ZE-
TB1
PWR
TO DISPLAY
CO
REMOTE GDS-IR SENSOR
A
GASMAX CX GAS MONITOR
GASMAX CX Operation & Maintenance Manual, Revision 1.0
CONNECTING AN EXTERNAL 4-20MA INPUT DEVICE
The GASMAX CX supports two general purpose, non-isolated 4-20mA inputs as shown below. The amount
of voltage and current available for the remote 4-20mA device is determined by the GASMAX DC supply
connected to TB1. Both channels support local calibration if necessary; if the devices are pre-calibrated, or
are calibrated at the source, the calibration feature on each channel can be disabled.
INPUT:
TB2 – 1: +24VDC Excitation Out
TB1 – 2: Channel 1 4-20mA Input
TODISPLAY
TB1 – 3: Common
LOCAL
SENSOR
TB1 – 3: Channel 2 4-20mA Out
CH2
TB1 – 4: Power / Signal Common
Figure 4-12: Remote 4-20mA Input
Page 21
CH1
420 IN2
A/COM
R/PWR
E-NET
COM
TB1 – 2: Channel 1 4-20mA Out
C/420 IN1
TB1 – 1: +24VDC Input
420 OUT2
OUTPUT:
420 OUT1
PWR
TB1 – 4: Channel 2 4-20mA Input
GASMAX CX Operation & Maintenance Manual, Revision 1.0
5 SETUP AND OPERATION
GASMAX CONTROLS AND DISPLAY
There are four magnetic switches on the face of the GASMAX CX,
arranged in a quadrant around the LCD display. Starting in the upper
left and proceeding clockwise these are labeled UP, NEXT, EDIT and
DN/CAL. To activate, or “press” a magnetic switch, swipe the magnet
near the switch. For the balance of this manual, the term “press” will
be used to describe activation of any key via the magnetic wand.
Below the LCD display, two LEDs monitor the MODBUS RS-485 or
Ethernet network interface. Flashing indicates sent or received data.
The EDIT key activates the USER MENU mode (See Chapter 8). During USER MENU mode, the UP, DN and
NEXT keys are used to select and confirm menu entries. The USER MENU allows the operator to view the
Event Log and channel parameters and change system settings such as alarm levels and real time clock
day and date.
Pressing the DOWN/CAL key, followed by the EDIT key, initiates calibration mode. For a detailed
description of calibration, see Chapter 6.
When not viewing any of the user menus, pressing the NEXT key momentarily causes the GASMAX CX
display to sequence between DUAL CHANNEL DATA DISPLAY, CHANNEL 1 TREND DISPLAY, CHANNEL 2
TREND DISPLAY, CHANNEL 1 DATA DISPLAY and CHANNEL 2 DATA DISPLAY as shown below. If only one
channel is enabled, the dual channel display mode and corresponding data and trend screens are not
included in the rotation.
Figure 5-1: GASMAX CX Display Screen Sequence
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GASMAX CX Operation & Maintenance Manual, Revision 1.0
DISPLAY SCREENS
The DATA display screen shows a single channel’s information. The current value is shown in calibrated
engineering units. A horizontal bargraph tracks the current value and shows the Alarm 1 and Alarm 2
values in graphical form. The user-programmable Engineering Units (“Eunits”) and programmable Tag
Name (“Measurement Name”) text strings are shown below the real-time reading. If the channel is in
Alarm 1, the background color changes to YELLOW, and if the channel is in Alarm 2, the background color
changes to RED.
“UP/RESET”
“NEXT”
Current Reading
Programmable
Engineering Units
Programmable Tag Name
“DN/CAL”
“EDIT”
Figure 5-2 GASMAX DATA DISPLAY
Below the LCD display, two LEDs indicate the status of the Ethernet or serial MODBUS communications
channels.
The TREND display shows a graph of the most recent 30 minute interval for the channel value. The graph
is scaled to match the channels zero and span settings and shows the trend line, real-time value and
Alarm 1 and Alarm 2 settings as Yellow and Red horizontal lines.
Current Reading
Last 30 minute trend
Alarm 2 Level
Alarm 1 Level
Figure 5-3 GASMAX TREND DISPLAY
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GASMAX CX Operation & Maintenance Manual, Revision 1.0
INITIAL SETUP
Once installed, apply power to the GASMAX CX and verify that the LCD display is active. Certain sensors
may initially indicate off-scale high or low values, but should quickly return to zero if no target gas is
present. During this warm-up delay period, the 4-20mA output is held at 4.0 mA to eliminate false alarms
in any receiving devices. Warm-up delay is one of the user-adjustable parameters.
Once operational, the user should verify the following settings prior to initial calibration:
Local time and date: Check date value and adjust time for proper time zone.
Tag name or Engineering Units settings: Edit values as necessary.
CAL SPAN GAS value: Set to match concentration of calibration gas cylinder.
CAL MARKER value: Adjust desired output mA during calibration.
ALARM 1, ALARM 2, ALARM 3 settings: Set for desired levels. NOTE: If relays are not installed, GASMAX CX
programmable alarm levels affect operation of display color only (Sec 7-3).
Allow the GASMAX CX to stabilize for at least four hours, preferably overnight if possible. This will allow all
sensors to reach stable equilibrium with respect to environmental conditions such as ambient
temperature, humidity, and barometric pressure as well as applied “reference” and “counter” voltages
generated by the GASMAX CX electronics. At this point, the GASMAX CX can be calibrated and made
operational.
NORMAL OPERATING MODE
During normal operation, the GASMAX display shows the current gas reading in direct calibrated
engineering units. If the reading goes above the Alarm 1 or Alarm 2 values, the display will change color
and flash, and the internal relays, if installed and programmed properly, will activate. The 4-20mA
outputs will transmit values that represent the % of scale shown on the display. If the sensor
malfunctions, or is removed, the display will turn red and the message FAULT will appear on the screen.
ALARM OPERATION – ALARM 1, 2 AND 3
Each channel can be programmed for up to three independent alarm levels, and can be set to alarm
ABOVE the target value for BELOW the target value. All programming is done in engineering units that
correspond to the channels ZERO and SPAN settings. Alarm processing will trigger an alarm condition
when the input exceeds the programmed value, and includes hysteresis to keep the alarm from rapidly
switching ON and OFF if the input remains close to the programmed alarm value.
NOTE: ALARM RELAYS ARE NORMALLY TRIGGERED IF EITHER CHANNEL 1 OR CHANNEL 2 ALARM
THRESHOLDS ARE EXCEEDED.
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GASMAX CX Operation & Maintenance Manual, Revision 1.0
NOTE: IF THE OPTIONAL ALARM RELAYS ARE NOT INSTALLED, ALARM SETTINGS AFFECT THE OPERATION
OF THE FRONT PANEL DISPLAY ONLY. SEPARATE ALARM SETTINGS MAY NEED TO BE PROGRAMMED IN
THE 4-20MA RECEIVING DEVICE.
ALARM OPERATION – FAULT
FAULT is typically used to indicate FAULT conditions that suggest sensor failure or “out of measurement
range” conditions.
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GASMAX CX Operation & Maintenance Manual, Revision 1.0
6 CALIBRATION
CALIBRATION OVERVIEW
Calibration is critically important to ensure correct operation of the GASMAX CX. The built-in CAL MODE
function is designed to make calibration quick, easy and error free; a successful ZERO and SPAN
calibration requires only four keystrokes. During CAL MODE zero and span, the sensor output is
disconnected and the GASMAX CX transmits a fixed mA value, called the CAL MARKER, to notify the
receiving device that a calibration is in progress. During the following CAL PURGE DELAY time, the
GASMAX CX transmits a fixed 4.0 mA signal to prevent external alarms during calibration. In the case of
local or remote Oxygen sensors, during CAL PURGE DELAY the output simulates a typical atmospheric
reading of 20.8%. CAL MODE automatically exits if no keystrokes are detected after 5 minutes.
Follow these GASMAX CX calibration guidelines:
•
Calibration accuracy is only as good as the calibration gas accuracy. GDS Corp calibration gases
are traceable to NIST (National Institute of Standards and Technology).
•
Never use calibration gas that has passed its expiration date.
•
Check the SPAN GAS VALUE setting and make sure it matches the calibration gas. (See Fig. 6-2)
•
Always use a GDS Corp calibration cup that completely surrounds the sensor head.
•
Be sure to use ZERO AIR, a mixture of 21% oxygen and 79% nitrogen, as a zero reference unless
you are certain that no target gas exists in the area. Ambient gas may result in an ‘elevated zero’
condition that will cause a FAULT to occur once the ambient gas is no longer present.
•
Always calibrate a new sensor before depending on the device for personnel or equipment
safety
•
Calibrate on a regular schedule. GDS Corp recommends a full calibration every 3 months, with
periodic ‘bump tests’ on a more frequent basis to ensure that the sensor has not been affected
by temperature extremes or the presence of incompatible gases.
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GASMAX CX Operation & Maintenance Manual, Revision 1.0
CALIBRATION PROCEDURE
Before beginning calibration, make sure you have the following items: A cylinder of calibration gas, fixed
flow regulator and an appropriate calibration cup connected to the regulator via a length of flexible
tubing. If necessary, a cylinder of ‘zero air’ may be necessary if the absence of target gas cannot be
confirmed. GDS Corp recommends a flow rate of 0.5 liters / minute for standard gases and a flow rate of
1.0 liters / minute for highly reactive gases such as chlorine or chlorine dioxide.
Flexible Tubing
Fixed Flow Regulator
Cylinder of
Calibration Gas
Calibration Cup
To calibrate a GASMAX CX detector:
1.
For dual channel units, press the NEXT key until that the DATA Display screen for the desired
channel is shown.
2.
To enter CAL MODE, press the DOWN / CAL key and within 5 seconds press the EDIT key.
3.
The screen will display an APPLY ZERO message. Using the setup shown in Fig. 5-1, apply clean
ZERO air unless it can be guaranteed that no target gas is present. After the reading stabilizes,
press the EDIT key to complete the ZERO calibration.
4.
If the ZERO CAL SUCCESSFUL message is displayed, an APPLY SPAN message will appear. Apply
the correct SPAN gas. After the reading is stable, (approximately 1 minute) press the EDIT key to
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GASMAX CX Operation & Maintenance Manual, Revision 1.0
complete the SPAN GAS calibration. If the SPAN calibration is successful, the display flashes
REMOVE CAL GAS and starts the CAL PURGE delay.
5.
Immediately shut off the regulator and remove the calibration cup. At the end of the CAL PURGE
delay, the GASMAX EC output is re-enabled and the unit is fully operational.
The flow chart shown in Figure 5-2 illustrates the above procedure. UP, CAL, NEXT & EDIT labels indicate
keystrokes using the magnetic wand. ZERO or SPAN calibration will fail if the readings exceed built-in
limits for maximum allowable zero or minimum allowable span.
NOTE: A CAL MODE INFO SCREEN IS AVAILABLE TO VIEW CERTAIN CAL MODE PARAMETERS DURING
CALIBRATION. HOLD THE UP KEY FOR 5 SECONDS DURING CAL MODE TO DISPLAY THIS SCREEN.
Figure 6-1: Calibration Flowchart
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GASMAX CX Operation & Maintenance Manual, Revision 1.0
7 MAINTENANCE
NORMAL MAINTENANCE
Normal maintenance for the GASMAX CX primarily involves periodic calibration on standard intervals. GDS
Corp recommends calibration at least every three months, or more often if temperature extremes,
vibration, the presence of incompatible gases or other environmental factors may accelerate the
deterioration of the sensor element. Calibration should also include inspections for clogged or wet sensor
heads, cracked or damaged enclosures and water incursion inside conduit or junction boxes.
SENSOR REPLACEMENT – LOCAL SENSORS
If a sensor shows FAULT, does not respond to gas or can no longer be calibrated, it should be replaced.
GASMAX CX monitors use GDS Corp type 10-98XX toxic or combustible sensors, where the XX is the gas
type, or GDS-IR infrared sensors. For toxic or combustible sensors, the range value should also be
specified when ordering replacement sensors. For example, a replacement H2S sensor for 0-100 ppm
would be “10-9815-R0100”.
To replace a GASMAX local sensor:
1.
Declassify the area or remove power to the GASMAX CX.
2.
Unscrew the sensor head cover. If unable to open the cover by hand, use a Sensor Head
Replacement Tool (p/n 10-0187).
3.
Remove the old sensor by pulling straight down.
NOTE: DO NOT TRY TO UNSCREW THE SENSOR. PULL STRAIGHT DOWN!
4.
Carefully install the replacement sensor by aligning the arrow on the sensor with the arrow
engraved on the sensor head. Push straight up until the sensor connector seats firmly into the
sensor connector.
5.
Reinstall the sensor head cover by CAREFULLY screwing the cover onto the sensor head.
NOTE: IF THE SENSOR FALLS OUT OF THE SOCKET DURING THIS STEP, IT CAN BE DAMAGED. USE
CAUTION WHEN REINSTALLING THE COVER.
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GASMAX CX Operation & Maintenance Manual, Revision 1.0
Figure 7-1: GASMAX Sensor Replacement
Local Smart Sensors are automatically recognized by the GASMAX CX and the Smart Sensor identification
screen should appear immediately after the installation of a local Smart Sensor. If the sensor is the same
gas type as was previously installed, the sensor’s calibration data will be uploaded into the GASMAX CX.
All other parameters stored in the GASMAX CX will be retained.
GASMAX CX units can be reconfigured for different sensors by simply installing a different type
compatible sensor. If a new sensor TYPE is installed, the Smart Sensor identification screen will appear,
followed by the ERROR CODE 01 message and the user will be given the opportunity to confirm the new
sensor type. If the user activates the EDIT key, all data stored in the new sensor’s database – including
range, tag name, cal span value, engineering units and alarm levels – will replace the current settings.
SENSOR REPLACEMENT – REMOTE SENSORS
To replace a GASMAX remote sensor:
1.
Declassify the area or remove power to the GASMAX CX.
2.
Unscrew the sensor head cover. If unable to open the cover by hand, use a Sensor Head
Replacement Tool (p/n 10-0187).
3.
Remove the old sensor by pulling straight down.
NOTE: DO NOT TRY TO UNSCREW THE SENSOR. PULL STRAIGHT DOWN!
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GASMAX CX Operation & Maintenance Manual, Revision 1.0
4.
Carefully install the replacement sensor by aligning the arrow on the sensor with the arrow
engraved on the sensor head. Push straight up until the sensor connector seats firmly into the
sensor connector.
5.
Reinstall the sensor head cover by CAREFULLY screwing the cover onto the sensor head.
NOTE: IF THE SENSOR FALLS OUT OF THE SOCKET DURING THIS STEP, IT CAN BE DAMAGED. USE
CAUTION WHEN REINSTALLING THE COVER.
6.
At the GASMAX CX, activate the Main Menu, open the Sensor Information page and select Install
New Sensor. This will reset the Sensor Life settings and tell the GASMAX that a new sensor is
available.
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GASMAX CX Operation & Maintenance Manual, Revision 1.0
8 TROUBLESHOOTING
TOXIC SENSOR INDICATES FAULT OR OVERRANGE
•
Certain toxic sensors indicate off-scale low or high at power up and quickly drift towards zero.
This is normal behavior.
•
Toxic sensors showing constant FAULT: If local, remove sensor and examine for moisture or
discoloration. Replace sensor if wet or discolored. If remote, check sensor cable and junction box
for moisture or standing water. Remove sensor and examine for moisture or discoloration.
FAULT indication generally indicates sensor useful life is exhausted.
•
Toxic sensors left unpowered for more than 3 months are subject to accelerated degradation and
may demonstrate a permanent loss of sensitivity.
TOXIC SENSOR WILL NOT CALIBRATE
•
Sensor reading during zero calibration exceeds upper limit of zero – sensor is defective and
should be replaced.
•
Sensor reading during span calibration too low – sensor may be defective. However, it may be
possible to temporarily continue operation by increasing PREAMP GAIN.
BRIDGE SENSOR INDICATES FAULT OR OVERRANGE
•
Catalytic bead combustible sensors generally indicate off-scale high at power up and quickly drift
towards zero as they reach operating temperature. This is normal behavior.
•
Combustibles sensors showing constant OVERRANGE may have defective bead. If remote, check
wiring for correct excitation voltage at sensor. Replace sensor.
BRIDGE SENSOR WILL NOT CALIBRATE
•
Sensor reading during zero calibration exceeds limits – readjust SENSOR BALANCE to reset zero if
possible. If not, sensor is defective and should be replaced.
•
Sensor reading during span calibration too low – sensor may be defective. However, it may be
possible to temporarily continue operation by increasing PREAMP GAIN. See Section 8.2 for
more details.
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GASMAX CX Operation & Maintenance Manual, Revision 1.0
RECEIVING DEVICE AND GASMAX DISPLAYED VALUES DON’T MATCH
•
Check that zero and full scale range values match between GASMAX and receiving device
(controller). Use DIAGNOSTICS menu to force GASMAX CX output to 12mA (1/2 scale) and verify
appropriate half-scale reading on controller.
•
Check for high impedance shorts to ground on 4-20mA wiring.
•
If 4-20mA output is off-scale low or high and cannot be adjusted using DIAGNOSTICS mode,
IO/Power Supply board may be defective and should be replaced.
CONTROLLER MODBUS DATA INCORRECT
•
Verify the MODBUS master is requesting data from registers 31001 for CH 1, 31002 for CH 2.
•
Verify that controller MIN and MAX count settings are correct. MIN counts should be “800”
which corresponds to 4mA and MAX counts should be “4000” which corresponds to 20 mA.
•
Verify that the GASMAX MODBUS address matches the address programmed into the controller’s
channel configuration.
CONTROLLER SHOWING MODBUS COMM ERROR
•
Check for incorrect MODBUS polarity (swap “A” and “B” if unsure; no damage will occur).
•
Verify that MODBUS master is requesting data from correct MODBUS address.
•
Verify that MODBUS master is requesting correct registers: 31001 for CH 1, 31002 for CH 2.
•
Verify that there are no other MODBUS slave devices with identical MODBUS address.
GASMAX DISPLAY BLANK
•
Verify DC power at IO/Power Supply board, TB1, terminals 1 (+24) and 4 (Gnd).
•
Verify ribbon cable connected between IO/Power Supply board and Display Assembly.
SOFTWARE RESET (“COLD BOOT”)
If the GASMAX display shows ‘nonsense’ characters or one or more of the settings appear to be
corrupted, performing a “Cold Boot” will restore the default values in the non-volatile memory and may
clear the problem. To perform a ‘Cold Boot”, hold the magnetic wand over the EDIT key while applying
power.
Note that a COLD BOOT will reset certain values to their default setting, including the MODBUS address
value. If a Smart Sensor is connected to a local sensor head, the GASMAX will reload the sensor type,
range, cal span value and other sensor –related values automatically.
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GASMAX CX Operation & Maintenance Manual, Revision 1.0
9 SPECIFICATIONS
Model
Power Input
Display
Channel One
Input
GASMAX CX Single / Dual Channel Gas Monitor
10-30VDC at < 10 watts with relay board. Additional power required for Extended
Temp & GDS-IR option.
Full color LCD with engineering units, bargraph and 30-minute trend
Digital input for GDS Corp 10-98xx Smart Toxic Sensors
Bridge input for GDS Corp 10-98xx Catalytic Bead, SmartIR or PID sensors
Analog 4-20mA input
Channel Two
Input
Digital input for GDS Corp 10-98xx Smart Toxic Sensors
Analog 4-20mA input
Accuracy
+/- 5% of full scale (typical)
Standard
Output
Dual three-wire 4-20mA current source outputs with fault and overrange indication.
Maximum loop resistance is 750 ohms with standard 24VDC supply
Optional
Output
Relay / MODBUS interface with 4x 5A SPDT programmable alarm relays
Temperature
Dual channel MODBUS interface
Electronics -40°C to +60°C. See Sensor Manual for additional details
Memory
On-board non-volatile memory retains all user settings
Housing
Aluminum housing with epoxy paint standard; #316 stainless steel optional
One ¾” NPT female connection for local sensor head
Two ¾” NPT female connections for conduit or cable glands
Dimensions
Width 5.4” (137 mm), Height 8” (203 mm), Depth 5” (127 mm) Shipping weight 6.5
pounds (3 kg)
Approvals
CSA Certified Division 1 & 2 Groups B, C, D. Suitable for explosion-proof installations
with flame arrestor
Warranty
Two years on electronics, one year on sensor
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GASMAX CX Operation & Maintenance Manual, Revision 1.0
10 USER MENUS
The GASMAX CX gas monitor used in the GDS-68XP has a menu-driven user interface that allows the
operator to review and adjust a wide range of settings. In the GDS-68XP, channel 1 of the GASMAX CX
measures the “raw sensor” gas level and channel 2 provides continuous display, output and alarming on
the stored value retained in the sequencer memory.
To access the Main Menu, activate the EDIT key with a magnetic wand.
Main Menu
Alarm Outputs
Channel Settings
Comm Settings
Security
System
Diagnostics
→
→
→
→
→
→
Alarm Outputs
Relay 1
→
Relay 2
→
Relay 3
→
Alarm Output Menu – contains settings that control the four optional
alarm relays (if installed). These setting include relay programming, on
and off delay, failsafe mode and specific input override.
Channel Settings
Channel 1
→
Channel 2
→
Channel Settings Menu – contains settings specific to each channel.
These include tag names, range, calibration settings and alarm levels.
Comm Settings
COMM 1 Settings
COMM 2 Settings
ModbusTCP
Network Settings
Troubleshooting
→
→
→
→
→
Comm Settings Menu – contains settings specific to the Ethernet
network interface, MODBUS/TCP interface and optional RS-485 serial
ports (if installed).
Security
Code to Lock
****
Modbus/Web Code
1234
Contact Info
System
Version
v1.00
Configure
→
Digital Input
→
View Event Log
→
Clear Event Log →
View Sensor Life →
Diagnostics
Relays
Analog Inputs
Analog Outputs
LED Test
Serial Ports
ADC Readings
→
→
→
→
→
→
Security Settings Menu – allows the user to restrict operation for some
or all of the features as well as provide a programmed contact name.
System Settings Menu – contains settings that are unit specific. These
include unit name. time and date, warm-up and calibration delay
settings, and Event Log.
Diagnostics Menu – comprehensive set of tools that can be used to
activate relays, simulate output values and test serial ports.
Figure 10-1: Main Menu Tree
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GASMAX CX Operation & Maintenance Manual, Revision 1.0
ALARM OUTPUTS MENU
The Alarm Outputs Menu controls the four optional alarm relays (if installed). These setting include relay
programming, acknowledge, failsafe mode and specific input override options.
NOTE: The Alarm / Modbus board containing the 3x alarm relays and 1x fault relay is optional on the
GDS-68XP.
Alarm Outputs
Relay 1
→
Relay 2
→
Relay 3
→
All three relay outputs are identical and can be set to respond to
channel 1 or channel 2 events. The fault relay is always dedicated to
Relay x
Alarm 1
Alarm 2
Alarm 3
Fault
Acknowledge
Failsafe
Override
Off
Off
Off
Off
No
No
None
Alarm 1, 2, 3 and Fault – Determines which channel or combination of
channels can activate the relay. Options are “Off”, “Ch1”, “Ch2”, “Ch1 and
Ch2”, and “Ch1 or “Ch2”.
Acknowledge – Determines if the alarm can be reset by an Acknowledge
command (YES) or not (NO).
Failsafe – Determines if the relay is OFF when inactive (NO) or ON when
inactive (YES). Failsafe connections thru the Normally Open connection will
open automatically if the alarm activates or if power is lost.
Override – Allows the relay to be dedicated to a specific channel alarm
level or function such as calibration. Settings that involve calibration allow
None
Ch1 Alarm 1
Ch1 Alarm 2
Ch1 Alarm 3
Ch1 Fault
Ch2 Alarm 1
Ch2 Alarm 2
Ch2 Alarm 3
Ch2 Fault
Ch1/2 Cal Zero
Ch1 Cal Span
Ch2 Cal Span
1/2 Cal Zero/Span
the relay to be connected to a cylinder of calibration gas via a solenoid
valve to enable automatic application of calibration gas if the unit is placed
in Cal Mode.
Figure 10-2: Alarm Outputs Menu Tree
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GASMAX CX Operation & Maintenance Manual, Revision 1.0
CHANNEL SETTINGS MENU
The Channel Settings Menu allows the user to adjust individual channel or sensor-specific features. Data
in the Channel Settings Menu is uploaded from Smart Sensors, and written back to any local Smart Sensor
if changed in the menu.
Channel Settings
Channel 1
→
Channel 2
→
All three relay outputs are identical and can be set to respond to channel 1 or channel
2 events. The fault relay is always dedicated to fault events.
Channel x
Alarm 1
Alarm 2
Alarm 3
Fault Alarm
Data From
Temp. Comp.
Configure
Calibrate
Both channel setup menus are identical so only one is shown.
→
→
→
→
→
→
→
→
Alarm X menu (all three alarm setting menus are identical)
Set Point is the engineering unit value where the alarm trips. It may be
negative or positive.
Latching YES causes the alarm to remain active even after the event clears.
NO clears the alarm automatically.
Alarm x
Setpoint
20.00
Latching
No
Trip On
High
Fault
Off
On Delay(sec)
0
Off Delay(min) 0
Dead Band %
1
Trip On HIGH causes the alarm to activate if the value goes above the
setpoint. Trip On LOW activates the alarm if the value goes below the
setpoint.
On / Off Delay adjusts the time delay between the time when the event
occurs and when the alarm is activated.
Deadband prevents alarm cycling when the value is close to the alarm
level.
Fault Alarm
Setpoint
-10.00
Fault Alarm setpoint is typically set at -10% of full scale.
Data From
EC Sensor
Remote Sensor No
Min Raw
800
Max Raw
4000
Filter Samples 20
Polarity
POS
PGA Gain
→
Heater Enabled No
Heat(degC) 10.0
Data From Menu
Data From determines the source of the data for this channel.
Min Raw / Max Raw – Set the range of the input A/D converter. Normally
set to 800 (min) and 4000 (max). Useful if a sensor’s output does not
provide a full range signal.
Filter Samples – Number of samples used by the smoothing filter.
PGA Gain – sets the analog amplification level in the smart sensor interface
circuit. WARNING: Changing PGA gain resets calibration data.
Heater Enabled – Determines if the internal sensor heater is ON or OFF.
Heat(degC) – Heater thermostat setting.
Figure 10-3: Channel Settings Menu Tree (1)
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GASMAX CX Operation & Maintenance Manual, Revision 1.0
Temperature Compensation compensates for changes in sensor output
(gain) and zero value (offset) as sensor temperature changes. Individual
values for gain and offset can be entered for eleven points ranging from
Temp. Comp.
Temp Gain Offset
-40 1.00 +0.00
-30 1.00 +0.00
-20 1.00 +0.00
-10 1.00 +0.00
0 1.00 +0.00
+10 1.00 +0.00
+20 1.00 +0.00
+30 1.00 +0.00
+40 1.00 +0.00
+50 1.00 +0.00
minus 40C to +60C. Gain and offset values are linearly interpolated
between points by the internal microprocessor.
NOTE: These values are typically set by the sensor manufacturer and
should not be changed.
Configure Menu
Measurement Name – User-programmable character string to describe the
channel. Otherwise called “tag name”.
E. Units – User-programmable character string that describes the
engineering units value.
Configure
Hydrogen Sulfide
E. Units
ppmH2S
Zero
0.00
Span
100.0
Decimal Points 0
Channel On?
Yes
Deadband (%) 0.00
Backup/Restore →
Zero – Channel zero value, typically “0”.
Span– Channel full scale value. Max value is “9999”.
Decimal Points – Determines the number of displayed digits to the right of
the decimal point.
Channel On? – Channel ON or OFF setting. An “OFF” channel will have no
effect on any alarm or output value.
Deadband (%) – The value, around zero, for which the screen will show
“0.0”. Eliminates display of small values around zero due to sensor drift.
Calibrate
Offset
1.73
Gain
1.00
Cal Zero
0.00
Cal Span
100.0
Set Unity Gain →
Backup / Restore Calibrate Menu
Offset – Shows the computed offset value based on the latest calibration.
Gain – Shows the computed gain value based on the latest calibration.
Cal Zero – The value for the zero point calibration
Cal Span – The value for span calibration, typically 50% of full scale.
Set Unity Gain – Clears gain and offset to “1.00” and “0.00” respectively.
WARNING: Set Unity Gain resets calibration data.
Figure 10-4: Channel Settings Menu Tree (2)
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COMM SETTINGS MENU
The Comm Settings Menu allows the user to configure the Ethernet interface, MODBUS/TCP slave and
two optional RS-485 serial interfaces.
Comm Settings
COMM 1 Settings
COMM 2 Settings
ModbusTCP
Network Settings
Troubleshooting
Comm X Menu (both comm port setting menus are identical)
→
→
→
→
Type (“Modbus Slave”) determines whether the MODBUS port is a master
or slave.
Baud Rate – Sets the baud rate for the serial port. Options are 9600,
→
19200, 38400, 57600 and 115200 baud.
Slave ID - Sets the MODBUS slave ID for the serial port.
Byte Order – sets the byte order for words larger than 16 bits.
COMMx Settings
Modbus Slave
BaudRate
9600
Parity
None
Slave ID
42
Byte Order
BADC
Enable LEDs
Yes
Enable LEDs – If YES, front panel LEDs indicate MODBUS transmission.
MODBUS TCP Menu
Slave Settings:
Byte Order – sets the byte order for words larger than 16 bits.
Master Settings:
ModbusTCP
Slave
Byte Order BADC
Master
Timeout(ms) 500
Poll Dly(ms) 250
Enable LEDs
Yes
Timeout – Length of time (in mSec) that master will wait for a reply before
indicating a comm timeout.
Poll Delay – Length of time (in mSec) between sequential read requests.
Enable LEDs – if YES, front panel LEDs indicate MODBUS / TCP transmission
Network Settings Menu
DHCP Enabled – If YES, uses a remote DHCP server to establish a network
Network Settings
DHCP Enabled Yes
Hostname
Unit-44-1000
Ip Address
169.254.100.10
Netmask
254.254.0.0
address. If NO, uses fixed address.
Hostname – Character string that defines device network name
IP Address – Network address. If DHCP enabled, will show address assigned
by DHCP server. If DHCP disabled, is IP address programmed by user.
Net mask – Network mask value. See above.
Gateway – Network gateway value. See above.
Troubleshooting
View Error Count
Clear Error Count
Troubleshooting Menu
View Error Count – View a menu that tracks the number of network errors
Clear Error Count – Resets number of network errors to zero.
Figure 10-5: Comm Settings Menu
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GASMAX CX Operation & Maintenance Manual, Revision 1.0
SYSTEM SETTINGS MENU
The Comm Settings Menu allows the user to configure the Ethernet interface, MODBUS/TCP slave and
two optional RS-485 serial interfaces.
System
Version
v1.00
Configure
→
Digital Input
→
View Event Log
→
Clear Event Log →
View Sensor Life →
Configure Menu
Date & Time – Sets the system date and time. Used for display and event
log entries.
Warm Up Delay – Sets length of time (in minutes) from power on to output
signals active. During Warmup Delay the 4-20mA outputs are set to 4mA.
Cal Purge Delay - Sets length of time (in minutes) that outputs are disabled
following a zero or span calibration
Configure
Unit-44-1000
Date
01/25/2013
Time
04:33:05
Warmup(m)
1
Cal Purge(m)
1
Block Neg
No
Send SensrLife No
InCal mA
0.00
Alm Refresh(m)
0
Block Negative – If YES, blocks screen from showing negative values.
Send Sensor Life – If YES, enables transmission of sensor life data across 420mA output (see GASMAX CX manual for more details).
InCal mA – Sets the 4-20mA output value to be transmitted during a
calibration sequencer. Enables remote devices to track “In Cal” status.
Alarm Refresh – See GASMAX CX manual.
Digital Input Menu
Digital Input
Mode Flt Override
Normally
Open
Channel Ch. 1 & 2
Mode – Determines action if digital input (fault ack input) is activated.
Normally – If Normally OPEN the action will occur if the contacts close; if
normally CLOSED the event will occur if the contacts open.
Channel – Determines which channel output is affected.
Hh:mm Ch
Event
01/25/2013
03:35 2 Fault Out
03:34 2 Fault In
03:33 2 Fault Out
03:32 2 Fault In
Event Log
Event Log Format – The event log includes the date, time and list of events
that occur. Events include cold boot, system boot, alarm reset, remote
alarm reset, log cleared, config edit, A1, A2 and A3 in and out, fault in and
out, calibration in and out, calibration fail, communications error, config
error and marker event.
Ch.1 Sensr Found
Life: 100%
__________________
Ch.2 No Sensor
Clear Event Log – Clears all entries in the event log.
View Sensor Life Menu
Life – Computed value based on initial stored ‘gain’ value when sensor was
first calibrated. If new gain equals original gain, sensor life = 100%. If new
gain equals twice original gain, sensor life = 0%.
Figure 10-6: System Settings Menu Tree
Page 40
GASMAX CX Operation & Maintenance Manual, Revision 1.0
DIAGNOSTICS MENU
The Diagnostics page provides tools for use during setup or testing. Tests for optional features are not
available if the feature is not installed.
Diagnostics
Relays
Analog Inputs
Analog Outputs
LED Test
Serial Ports
ADC Readings
→
→
→
→
→
→
!! Warning !!
Diagnostic mode.
Alarms will not
Be processed.
WARNING – ENTERING DIAGNOSTICS MODE DISABLED ALARM
FUNCTION AND REQUIRES A DEVICE REBOOT ON EXIT.
Edit (OK)
Next (Cancel)
Relay
Relay
Relay
Fault
Relays
1
2
3
Relay
Relays Menu
Off
Off
Off
On
Ch.1 EC - Loc
Counts: 856
Temp: 24.5 degC
—————————————————
Ch.2 4-20mA
Counts: 0
Current: 0.00mA
Analog Outputs
4-20mA Out1
0mA
4-20mA Out2
0mA
Allows individual relays to be turned on or off under user control. Only
available if optional Relay / Modbus board is installed.
Analog Inputs Menu
Shows current input readings for channel 1 and channel 2.
Analog Outputs Menu
Shows the live output values on analog channel 1 and analog channel 2.
Also shows the feedback monitor reading for both channels.
Out1 Fdbk
Out2 Fdbk
0.07
0.06
LED Test Menu
LED Test
Comm Test
Connect Loopback
Cycles the external LED.
Comm Test Menu
Performs a loopback test to verify proper operation of the serial
Port 1 => 2: Bad
components. Only available if optional Relay / Modbus board is installed.
Port 2 => 1: Bad
420 Out1:
Fdbk 1:
420 Out2:
Fdbk 2:
Sensor V:
SensrAmp:
PSU:
4.60mA
4.57mA
4.05mA
4.14mA
0.01V
0.78V
22.93V
ADC Readings
Displays values monitored by internal analog-to-digital converters.
Figure 10-7: Diagnostics Menu Tree
Page 41
GASMAX CX Operation & Maintenance Manual, Revision 1.0
11 NETWORK INTERFACE
MODBUS REGISTERS
The GASMAX CX features a full complement of user-accessible MODBUS registers that can provide a
complete snapshot of the gas detector configuration. This includes all real-time data, preset zero, span
and calibration values and user-programmable text.
Variable Name
Alias
Read
Write
Notes
Ch 1 Analog Output Raw
31001
4
N/A
12 bit value; 800 = 4mA, 4000 = 20mA
Ch 2 Analog Output Raw
31002
4
N/A
12 bit value; 800 = 4mA, 4000 = 20mA
Ch 1 A2D Raw Counts
31003
4
N/A
12 bit value from A/D converter
Ch 2 A2D Raw Counts
31004
4
N/A
12 bit value from A/D converter
Ch 1 Sensor Life
31009
4
N/A
16 bit signed integer ranging from -1 to 100
where -1 indicates Cal Required
Ch 2 Sensor Life
31010
4
N/A
16 bit signed integer ranging from -1 to 100
where -1 indicates Cal Required
Ch 1 Sensor Temp
31011
4
N/A
16 bit integer from 1 to 4095 scaled for
-55°C to +125°C
Ch 2 Sensor Temp
31012
4
N/A
16 bit integer from 1 to 4095 scaled for
-55°C to +125°C
Ch 1 4-20mA Out FP
31210
4
N/A
32 bit floating point
Ch 2 4-20mA Out FP
31212
4
N/A
32 bit floating point
Ch 1 Output Feedback FP
31214
4
N/A
32 bit floating point
Ch 2 Output Feedback FP
31216
4
N/A
32 bit floating point
12V Input FP
31218
4
N/A
32 bit floating point
Sensor Volts FP
31220
4
N/A
32 bit floating point
Bridge Amp FP
31222
4
N/A
32 bit floating point
Bridge Out FP
31224
4
N/A
32 bit floating point
Product ID
32001
4
N/A
Factory use only
Version
32002
4
N/A
Factory use only
Custom Feature
32003
4
N/A
Factory use only
Customer ID
32004
4
N/A
Factory use only
Lock Status
32005
4
N/A
Boot Year
32006
4
N/A
Last power-up time & date
Boot Month
32007
4
N/A
Last power-up time & date
Boot Day
32008
4
N/A
Last power-up time & date
Boot Hour
32009
4
N/A
Last power-up time & date
Boot Minute
32010
4
N/A
Last power-up time & date
Boot Second
32011
4
N/A
Last power-up time & date
SR 1 State
32020
4
N/A
True if relay #1 active
Page 42
GASMAX CX Operation & Maintenance Manual, Revision 1.0
SR 2 State
32021
4
N/A
True if relay #2 active
SR 3 State
32022
4
N/A
True if relay #3 active
FR State
32023
4
N/A
True if fault relay active
Warmup
32025
4
N/A
True if unit in warm-up
SR 1 Flashing
32026
4
N/A
True if relay #1 flashing
SR 2 Flashing
32027
4
N/A
True if relay #2 flashing
SR 3 Flashing
32028
4
N/A
True if relay #3 flashing
FR Flashing
32029
4
N/A
True if fault relay flashing
DI State
32034
4
N/A
Digital input status
Ch 1 Fixed Point
33001
4
N/A
Compatible with GASMAX II
CH 2 Fixed Point
33002
4
N/A
Compatible with GASMAX II
Ch 1 Floating Point
33010
4
N/A
32 bit IEEE 754 float
Ch 1 Value String
33012
4
N/A
6 character string, zero terminated
Ch 1 Temperature Float
33015
4
N/A
Sensor temperature
Ch 1 A1 Status
33017
4
N/A
True if alarm 1 active
Ch 1 A1 Flashing
33018
4
N/A
True if alarm 1 indicator flashing
Ch 1 A2 Status
33019
4
N/A
True if alarm 2 active
Ch 1 A2 Flashing
33020
4
N/A
True if alarm 2 indicator flashing
Ch 1 A3 Status
33021
4
N/A
True if alarm 3 active
Ch 1 A3 Flashing
33022
4
N/A
True if alarm 3 indicator flashing
Ch 1 Fault Status
33023
4
N/A
True if fault active
Ch 1 Comm Error
33024
4
N/A
True if comm error
Ch 1 Config Error
33025
4
N/A
True if config error
Ch 1 I/O Error
33026
4
N/A
True if input/output error
Ch 1 Cal Flag
33027
4
N/A
True if calibration in progress
Ch 1 Marker Flag
33028
4
N/A
True if marker active
Ch 1 Linearize
33029
4
N/A
True if linearization table active
Ch 1 Err Flashing
33030
4
N/A
True if channel error
Ch 2 Floating Point
33040
4
N/A
32 bit IEEE 754 float
Ch 2 Value String
33042
4
N/A
6 character string, zero terminated
Ch 2 Temp Float
33045
4
N/A
Sensor temperature
Ch 2 A1 Status
33047
4
N/A
True if alarm 1 active
Ch 2 A1 Flashing
33048
4
N/A
True if alarm 1 indicator flashing
Ch 2 A2 Status
33049
4
N/A
True if alarm 2 active
Ch 2 A2 Flashing
33050
4
N/A
True if alarm 2 indicator flashing
Ch 2 A3 Status
33051
4
N/A
True if alarm 3 active
Ch 2 A3 Flashing
33052
4
N/A
True if alarm 3 indicator flashing
Ch 2 Fault Status
33053
4
N/A
True if fault active
Ch 2 Comm Error
33054
4
N/A
True if comm error
Ch 2 Config Error
33055
4
N/A
True if config error
Page 43
GASMAX CX Operation & Maintenance Manual, Revision 1.0
Ch 2 I/O Error
33056
4
N/A
True if input/output error
Ch 2 Cal Flag
33057
4
N/A
True if calibration in progress
Ch 2 Marker Flag
33058
4
N/A
True if marker active
Ch 2 Linearize
33059
4
N/A
True if linearization table active
Ch 2 Err Flashing
33060
4
N/A
True if channel error
Alarm Reset
40001
N/A
3
System Name
40010
4
N/A
16 character ASCII text
Date Year
40020
3
N/A
Current time & date
Date Month
40021
3
N/A
Current time & date
Date Day
40022
3
N/A
Current time & date
Date Hour
40023
3
N/A
Current time & date
Date Minute
40024
3
N/A
Current time & date
Date Second
40025
3
N/A
Current time & date
Refresh Time
40026
3
N/A
Alarm refresh (minutes)
Warmup Time
40027
3
N/A
Warm up delay (minutes)
Cal Purge Time
40028
3
N/A
Cal purge delay (minutes)
Block Negative Flag
40029
3
N/A
True if prohibit display of neg values
Comm 1 Function
40030
3
N/A
MODBUS serial port #1
Comm 1 Baud Rate
40031
3
N/A
MODBUS serial port #1
Write to acknowledge alarm
Comm 1 Parity
40032
3
N/A
MODBUS serial port #1
Comm 1 Slave ID
40033
3
N/A
MODBUS serial port #1
Comm 1 Timeout
40034
3
N/A
MODBUS serial port #1
Comm 1 Poll Delay
40035
3
N/A
MODBUS serial port #1
Comm 1 Byte Order
40036
3
N/A
MODBUS serial port #1
Comm 1 Wireless T/O
40037
3
N/A
MODBUS serial port #1
Comm 1 LED Enable
40038
3
N/A
MODBUS serial port #1
Comm 2 Function
40040
3
N/A
MODBUS serial port #2
Comm 2 Baud Rate
40041
3
N/A
MODBUS serial port #2
Comm 2 Parity
40042
3
N/A
MODBUS serial port #2
Comm 2 Slave ID
40043
3
N/A
MODBUS serial port #2
Comm 2 Timeout
40044
3
N/A
MODBUS serial port #2
Comm 2 Poll Delay
40045
3
N/A
MODBUS serial port #2
Comm 2 Byte Order
40046
3
N/A
MODBUS serial port #2
Comm 2 Wireless T/O
40047
3
N/A
MODBUS serial port #2
Comm 2 LED Enable
40048
3
N/A
MODBUS serial port #2
DHCP Enabled
40050
3
N/A
Ethernet port; DHCP or fixed address
Host Name
40051
3
N/A
Ethernet port: 16 ASCII characters
IP Address
40066
3
N/A
Ethernet port: xxx.xxx.xxx.xxx
Net Mask
40070
3
N/A
Ethernet port: xxx.xxx.xxx.xxx
Page 44
GASMAX CX Operation & Maintenance Manual, Revision 1.0
Gateway IP
40074
3
N/A
Ethernet port: xxx.xxx.xxx.xxx
Modbus TCP Byte Order
40080
3
N/A
MODBUS/TCP function
Modbus TCP Timeout
40081
3
N/A
MODBUS/TCP timeout (mSec)
Modbus TCP Poll Delay
40082
3
N/A
MODBUS/TCP poll delay (mSec)
Save Config
40095
N/A
3
Write command to save local config
Config Changed
40096
3
N/A
True if config changed since last read
Security Unlock
40099
3
N/A
TBD
Relay 1 A1 Votes
40101
3
N/A
Alarm relay #1 configuration
Relay 1 A2 Votes
40102
3
N/A
Alarm relay #1 configuration
Relay 1 A3 Votes
40103
3
N/A
Alarm relay #1 configuration
Relay 1 Fault Votes
40104
3
N/A
Alarm relay #1 configuration
Relay 1 Override
40105
3
N/A
Alarm relay #1 configuration
Relay 1 Ack
40107
3
N/A
Alarm relay #1 configuration
Relay 1 Failsafe
40108
3
N/A
Alarm relay #1 configuration
Relay 2 A1 Votes
40111
3
N/A
Alarm relay #2 configuration
Relay 2 A2 Votes
40112
3
N/A
Alarm relay #2 configuration
Relay 2 A3 Votes
40113
3
N/A
Alarm relay #2 configuration
Relay 2 Fault Votes
40114
3
N/A
Alarm relay #2 configuration
Relay 2 Override
40115
3
N/A
Alarm relay #2 configuration
Relay 2 Ack
40117
3
N/A
Alarm relay #2 configuration
Relay 2 Failsafe
40118
3
N/A
Alarm relay #2 configuration
Relay 3 A1 Votes
40121
3
N/A
Alarm relay #3 configuration
Relay 3 A2 Votes
40122
3
N/A
Alarm relay #3 configuration
Relay 3 A3 Votes
40123
3
N/A
Alarm relay #3 configuration
Relay 3 Fault Votes
40124
3
N/A
Alarm relay #3 configuration
Relay 3 Override
40125
3
N/A
Alarm relay #3 configuration
Relay 3 Ack
40127
3
N/A
Alarm relay #3 configuration
Relay 3 Failsafe
40128
3
N/A
Alarm relay #3 configuration
Force Sensor Upload
40141
3
N/A
Binary
Digital Input Mode
40150
3
N/A
Alarm ack or flow switch input
Digital Input Type
40151
3
N/A
Alarm ack or flow switch input
Digital Input Mode
40152
3
N/A
Alarm ACK or flow switch input
Send Sensor Life
40153
3
N/A
True if transmit sensor life value
Contact Info String
40160
3
N/A
16 ASCII characters (2 per register)
Ch 1 Measurement Name
40401
3
N/A
16 ASCII characters (2 per register)
Ch 2 Measurement Name
40409
3
N/A
16 ASCII characters (2 per register)
Ch 1 EUNITS
40423
3
N/A
10 ASCII characters (2 per register)
Ch 2 EUNITS
40428
3
N/A
10 ASCII characters (2 per register)
Page 45
GASMAX CX Operation & Maintenance Manual, Revision 1.0
Ch 1 Preamp gain
40433
3
N/A
Contact factory
Ch 2 Preamp gain
40434
3
N/A
Contact factory
Ch 1 Cal Zero
42001
3
N/A
Modbus 32 bit IEEE 754 Floating Pt
Ch 1 Cal Span
42003
3
N/A
Modbus 32 bit IEEE 754 Floating Pt
Ch 1 Zero Value
42005
3
N/A
Modbus 32 bit IEEE 754 Floating Pt
Ch 1 Span Value
42007
3
N/A
Modbus 32 bit IEEE 754 Floating Pt
Ch 1 Fault Value
42009
3
N/A
Modbus 32 bit IEEE 754 Floating Pt
Ch 1 Alarm 1 Setpoint
42011
3
N/A
Modbus 32 bit IEEE 754 Floating Pt
Ch 1 Alarm 2 Setpoint
42013
3
N/A
Modbus 32 bit IEEE 754 Floating Pt
Ch 1 Alarm 3 Setpoint
42015
3
N/A
Modbus 32 bit IEEE 754 Floating Pt
Ch 1 Manual Gain
42017
3
N/A
Modbus 32 bit IEEE 754 Floating Pt
Ch 1 Manual Offset
42019
3
N/A
Modbus 32 bit IEEE 754 Floating Pt
Ch 2 Cal Zero Value
42021
3
N/A
Modbus 32 bit IEEE 754 Floating Pt
Ch 2 Cal Span Value
42023
3
N/A
Modbus 32 bit IEEE 754 Floating Pt
Ch 2 Zero Value
42025
3
N/A
Modbus 32 bit IEEE 754 Floating Pt
Ch 2 Span Value
42027
3
N/A
Modbus 32 bit IEEE 754 Floating Pt
Ch 2 Fault Value
42029
3
N/A
Modbus 32 bit IEEE 754 Floating Pt
Ch 2 Alarm 1 Setpoint
42031
3
N/A
Modbus 32 bit IEEE 754 Floating Pt
Ch 2 Alarm 2 Setpoint
42033
3
N/A
Modbus 32 bit IEEE 754 Floating Pt
Ch 2 Alarm 3 Setpoint
42035
3
N/A
Modbus 32 bit IEEE 754 Floating Pt
Ch 2 Manual Gain
42037
3
N/A
Modbus 32 bit IEEE 754 Floating Pt
Ch 2 Manual Offset
42039
3
N/A
Modbus 32 bit IEEE 754 Floating Pt
Ch 1 Alarm 1 Latch
43001
3
N/A
False = NO, True = YES
Ch 1 Alarm 1 Trip
43002
3
N/A
False = HIGH, True = LOW
Ch 1 Alarm 1 On Delay
43003
3
N/A
Activation delay in seconds
Ch 1 Alarm 1 Off Delay
43004
3
N/A
Deactivation delay in minutes
Ch 1 Alarm 1 Hysteresis
43005
3
N/A
Percent of scale
Ch 1 Alarm 2 Latch
43011
3
N/A
False = NO, True = YES
Ch 1 Alarm 2 Trip
43012
3
N/A
False = HIGH, True = LOW
Ch 1 Alarm 2 On Delay
43013
3
N/A
Activation delay in seconds
Ch 1 Alarm 2 Off Delay
43014
3
N/A
Deactivation delay in minutes
Ch 1 Alarm 2 Hysteresis
43015
3
N/A
Percent of scale
Ch 1 Alarm 2 Color
43016
3
N/A
TBD
Ch 1 Alarm 3 Latch
43021
3
N/A
False = NO, True = YES
Ch 1 Alarm 3 Trip
43022
3
N/A
False = HIGH, True = LOW
Ch 1 Alarm 3 On Delay
43023
3
N/A
Activation delay in seconds
Ch 1 Alarm 3 Off Delay
43024
3
N/A
Deactivation delay in minutes
Ch 1 Alarm 3 Hysteresis
43025
3
N/A
Percent of scale
Ch 1 Alarm 3 Color
43026
3
N/A
TBD
Ch 1 Alarm 3 Enabled
43027
3
N/A
False = NO, True = YES
Page 46
GASMAX CX Operation & Maintenance Manual, Revision 1.0
Ch 1 Data From
43031
3
N/A
Selection
Ch 1 Min Raw
43032
3
N/A
Binary (800)
Ch 1 Max Raw
43033
3
N/A
Binary (4000)
Ch 1 Remote ID
43034
3
N/A
Binary
Ch 1 Interface
43035
3
N/A
Binary
Ch 1 Byte Order
43036
3
N/A
Byte order
Ch 1 Alias
43037
3
N/A
Binary, 32 bit, 2x
Ch 1 IP Address
43039
3
N/A
Binary, 4x unsigned bytes
Ch 1 Port
43041
3
N/A
Binary, 32 bit, 2x
Ch 1 Remote Sensor
43043
3
N/A
Binary
Ch 1 DP
43079
3
N/A
Number of decimal points
Ch 1 Enable
43080
3
N/A
False = NO, True = YES
Ch 1 Deadband
43081
3
N/A
Modbus 32 bit IEEE 754 Floating Pt
Ch 1 Marker Enable
43083
3
N/A
False = NO, True = YES
Ch 1 Marker Percent
43084
3
N/A
Modbus 32 bit IEEE 754 Floating Pt
Ch 1 Marker Info
43086
3
N/A
6 ASCII characters
Ch 1 Marker Life
43089
3
N/A
Binary
Ch 1 Filter Count
43090
3
N/A
Binary, 0 to 60
Ch 1 Radio Reg
43091
3
N/A
Binary
Ch 1 Coefficient
43092
3
N/A
Binary
Ch 1 Bridge Voltage
43093
3
N/A
Modbus 32 bit IEEE 754 Floating Pt
Ch 1 Balance
43095
3
N/A
Binary
Ch 1 Heater Enable
43096
3
N/A
False = NO, True = YES
Ch 1 Heater Setpoint
43097
3
N/A
Modbus 32 bit IEEE 754 Floating Pt
Ch 1 Temp Comp -40
43099
3
N/A
32 bit FP Gain, 32 bit FP Offset
Ch 1 Temp Comp -30
43103
3
N/A
32 bit FP Gain, 32 bit FP Offset
Ch 1 Temp Comp -20
43107
3
N/A
32 bit FP Gain, 32 bit FP Offset
Ch 1 Temp Comp -10
43111
3
N/A
32 bit FP Gain, 32 bit FP Offset
Ch 1 Temp Comp 0
43115
3
N/A
32 bit FP Gain, 32 bit FP Offset
Ch 1 Temp Comp +10
43119
3
N/A
32 bit FP Gain, 32 bit FP Offset
Ch 1 Temp Comp +20
43123
3
N/A
32 bit FP Gain, 32 bit FP Offset
Ch 1 Temp Comp +30
43127
3
N/A
32 bit FP Gain, 32 bit FP Offset
Ch 1 Temp Comp +40
43131
3
N/A
32 bit FP Gain, 32 bit FP Offset
Ch 1 Temp Comp +50
43135
3
N/A
32 bit FP Gain, 32 bit FP Offset
Ch 1 Temp Comp +60
43139
3
N/A
32 bit FP Gain, 32 bit FP Offset
Ch 1 Sensor Type
43143
3
N/A
TBD
Ch 1 Send Sensor Life
43144
3
N/A
False = NO, True = YES
Ch 1 Cal mA Setting
43145
3
N/A
Modbus 32 bit IEEE 754 Floating Pt
Ch 1 Local Cal
43147
3
N/A
False = NO, True = YES
Ch 1 AI Range
43148
3
N/A
TBD
Page 47
GASMAX CX Operation & Maintenance Manual, Revision 1.0
Ch 2 Alarm 1 Latch
43201
3
N/A
False = NO, True = YES
Ch 2 Alarm 1 Trip
43202
3
N/A
False = HIGH, True = LOW
Ch 2 Alarm 1 On Delay
43203
3
N/A
Activation delay in seconds
Ch 2 Alarm 1 Off Delay
43204
3
N/A
Deactivation delay in minutes
Ch 2 Alarm 1 Hysteresis
43205
3
N/A
Percent of scale
Ch 2 Alarm 2 Latch
43211
3
N/A
False = NO, True = YES
Ch 2 Alarm 2 Trip
43212
3
N/A
False = HIGH, True = LOW
Ch 2 Alarm 2 On Delay
43213
3
N/A
Activation delay in seconds
Ch 2 Alarm 2 Off Delay
43214
3
N/A
Deactivation delay in minutes
Ch 2 Alarm 2 Hysteresis
43215
3
N/A
Percent of scale
Ch 2 Alarm 2 Color
43216
3
N/A
TBD
Ch 2 Alarm 3 Latch
43221
3
N/A
False = NO, True = YES
Ch 2 Alarm 3 Trip
43222
3
N/A
False = HIGH, True = LOW
Ch 2 Alarm 3 On Delay
43223
3
N/A
Activation delay in seconds
Ch 2 Alarm 3 Off Delay
43224
3
N/A
Deactivation delay in minutes
Ch 2 Alarm 3 Hysteresis
43225
3
N/A
Percent of scale
Ch 2 Alarm 3 Color
43226
3
N/A
TBD
Ch 2 Alarm 3 Enabled
43227
3
N/A
False = NO, True = YES
Ch 2 Data From
43231
3
N/A
Selection
Ch 2 Min Raw
43232
3
N/A
Binary (800)
Ch 2 Max Raw
43233
3
N/A
Binary (4000)
Ch 2 Remote ID
43234
3
N/A
Binary
Ch 2 Interface
43235
3
N/A
Binary
Ch 2 Byte Order
43236
3
N/A
Byte order
Ch 2 Alias
43237
3
N/A
Binary, 32 bit, 2x
Ch 2 IP Address
43239
3
N/A
Binary, 4x unsigned bytes
Ch 2 Port
43241
3
N/A
Binary, 32 bit, 2x
Ch 2 Remote Sensor
43243
3
N/A
Binary
Ch 2 DP
43279
3
N/A
Number of decimal points
Ch 2 Enable
43280
3
N/A
False = NO, True = YES
Ch 2 Deadband
43281
3
N/A
Modbus 32 bit IEEE 754 Floating Pt
Ch 2 Marker Enable
43283
3
N/A
False = NO, True = YES
Ch 2 Marker Percent
43284
3
N/A
Modbus 32 bit IEEE 754 Floating Pt
Ch 2 Marker Info
43286
3
N/A
6 ASCII characters
Ch 2 Marker Life
43289
3
N/A
Binary
Ch 2 Filter Count
43290
3
N/A
Binary, 0 to 60
Ch 2 Radio Reg
43291
3
N/A
Binary
Ch 2 Coefficient
43292
3
N/A
Binary
Ch 2 Bridge Voltage
43293
3
N/A
Modbus 32 bit IEEE 754 Floating Pt
Page 48
GASMAX CX Operation & Maintenance Manual, Revision 1.0
Ch 2 Balance
43295
3
N/A
Binary
Ch 2 Heater Enable
43296
3
N/A
False = NO, True = YES
Ch 2 Heater Setpoint
43297
3
N/A
Modbus 32 bit IEEE 754 Floating Pt
Ch 2 Temp Comp -40
43299
3
N/A
32 bit FP Gain, 32 bit FP Offset
Ch 2 Temp Comp -30
43303
3
N/A
32 bit FP Gain, 32 bit FP Offset
Ch 2 Temp Comp -20
43307
3
N/A
32 bit FP Gain, 32 bit FP Offset
Ch 2 Temp Comp -10
43311
3
N/A
32 bit FP Gain, 32 bit FP Offset
Ch 2 Temp Comp 0
43315
3
N/A
32 bit FP Gain, 32 bit FP Offset
Ch 2 Temp Comp +10
43319
3
N/A
32 bit FP Gain, 32 bit FP Offset
Ch 2 Temp Comp +20
43323
3
N/A
32 bit FP Gain, 32 bit FP Offset
Ch 2 Temp Comp +30
43327
3
N/A
32 bit FP Gain, 32 bit FP Offset
Ch 2 Temp Comp +40
43331
3
N/A
32 bit FP Gain, 32 bit FP Offset
Ch 2 Temp Comp +50
43335
3
N/A
32 bit FP Gain, 32 bit FP Offset
Ch 2 Temp Comp +60
43339
3
N/A
32 bit FP Gain, 32 bit FP Offset
Ch 2 Sensor Type
43343
3
N/A
TBD
Ch 2 Send Sensor Life
43344
3
N/A
False = NO, True = YES
Ch 2 Cal mA Setting
43345
3
N/A
Modbus 32 bit IEEE 754 Floating Pt
Ch 2 Local Cal
43347
3
N/A
False = NO, True = YES
Ch 2 AI Range
43348
3
N/A
TBD
Registers 45001-45022 added in V1.03
Ch 1 Value
45001
3
N/A
800 = “0”, 4000 = Full Scale
Ch 2 Value
45002
3
N/A
800 = “0”, 4000 = Full Scale
Ch 1 Value
45003/04
3
N/A
MODBUS 32 bit floating point
Ch 2 Value
45005/06
3
N/A
MODBUS 32 bit floating point
Ch 1 Alarm 1 Status
45007
3
N/A
“1” = Fault
Ch 1 Alarm 2 Status
45008
3
N/A
“1” = Fault
Ch 1 Alarm 3 Status
45009
3
N/A
“1” = Fault
Ch 1 Fault Status
45010
3
N/A
“1” = Fault
Ch 2 Alarm 1 Status
45011
3
N/A
“1” = Fault
Ch 2 Alarm 2 Status
45012
3
N/A
“1” = Fault
Ch 2 Alarm 3 Status
45013
3
N/A
“1” = Fault
Ch 2 Fault Status
45014
3
N/A
“1” = Fault
Ch 1 Sensor Life
45015
3
N/A
0-100 binary
Ch 2 Sensor Life
45016
3
N/A
0-100 binary
Ch 1 Sensor Temp
45017
3
N/A
Binary 0 - 4095
Ch2 Sensor Temp
45018
3
N/A
Binary 0 - 4095
Ch 1 Sensor Temp
45019/20
3
N/A
MODBUS 32 bit floating point
Ch 2 Sensor Temp
45021/22
3
N/A
MODBUS 32 bit floating point
Page 49
GASMAX CX Operation & Maintenance Manual, Revision 1.0
12 SPARE PARTS
Display Assembly:
10-0387
Display Board
10-0388
Relay / MODBUS Board
I/O Power Supply Board
10-0390
Power / I/O Board
Yellow Enclosure:
10-0160
GASMAX Enclosure
Sensor Head Assembly:
10-0247
Toxic or Bridge Direct (Type 1-2)
10-0247F
Toxic Direct / Reactive Gas (Type 3-4)
10-0248
Toxic Sensor Transmitter (Type 20-21)
10-0248F
Toxic S-T / Reactive Gas (Type 22-23)
Figure 12-1: GASMAX CX + Local Sensor Spare Parts
Page 50
GASMAX CX Operation & Maintenance Manual, Revision 1.0
Sensor Head Assembly (See list above):
Sensor Head Base
Sensor:
10-98xx (Toxic, combustible, SmartIR, PID)
Sensor Head Cover
Figure 12-2: GASMAX Sensor Head
SENSOR HEAD ACCESSORIES
Sensor Head Splash Guard
10-0198
Splash Guard (Fits all sensor heads
Sensor Head Flow Cell
10-0205
Splash Gu ard
Flow Cell (1/8” NPT compression fittings)
Flow Cell
Figure 12-3: GASMAX Sensor Head Splash Guard & Flow Cell
Page 51
GASMAX CX Operation & Maintenance Manual, Revision 1.0
13 DRAWINGS AND DIMENSIONS
5.25”
5.0”
7.75”
Figure 13-1 GASMAX CX DIMENSIONS
Page 52
GASMAX CX Operation & Maintenance Manual, Revision 1.0
4.25”
5.0”
7.75”
Figure 13-2 GASMAX CX REMOTE SENSOR TRANSMITTER DIMENSIONS
Page 53
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