Sierra Monitor Corporation 5100-02-IT User manual

MODEL 5100-02-IT
IT Series
COMBUSTIBLE GAS SENSOR MODULE
Version 3.00A
APPLICABILITY & EFFECTIVITY
Effective for all Model 5100-02-IT Modules manufactured after December 1, 2011.
Instruction Manual Part Number T12019
Rev. D

Model 5100-02-IT Combustible Gas Sensor Module
FM APPROVAL
ONLY THE FOLLOWING ITEMS, FUNCTIONS AND OPTIONS ARE FM*APPROVED
Notes:
1) FM Approval applies only to conventional (one cable run per sensor
module) or multiplexed (multiple sensor modules per cable) installations.
Apparatus must be installed in accordance with National Electrical Code.
2) FM Comments
*FM Approvals, a subsidiary of FM Global
Project# 3021050
Model 5100-02-IT Combustible Gas Sensor Module
Sensor Module
Model 5100-02-IT Combustible Gas Sensor Module
Model 5100-02-IT-SS Combustible Gas Sensor Module, 316SS
Calibration Equipment
Model 1200-26 Calibration Gas Delivery System
Model 1290-02 Combustible Gas Cylinder
Model 5358-01 Calibration Head, Standard
Model 5360-00 Calibration Gas Delivery Fitting
Model 1260-02 Combustible 50% LEL Gas Cylinder
Model 1260-42 Cylinder H2 50% LEL Type A
Model 1250-01 Gas Sensor Calibrator Kit, Type A
Model 1256-01 Regulator Type A Calibrator
Model 5394-51 Remote Sensor Option – 5100-02-IT

Model 5100-02-IT Combustible Gas Sensor Module
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TABLE OF CONTENTS
1. PRODUCT DESCRIPTION.................................................................................................................................3
1.1 GENERAL........................................................................................................................................................3
1.2 PRODUCT CONFIGURATION........................................................................................................................3
1.3 THEORY OF OPERATION..............................................................................................................................3
1.4 MODES OF OPERATION................................................................................................................................3
1.5 MECHANICAL .................................................................................................................................................4
1.6 INTERCONNECT WIRING..............................................................................................................................5
1.7 POWER REQUIREMENTS .............................................................................................................................5
2. CAUTIONS & WARNINGS.................................................................................................................................7
2.1 INTRODUCTION .............................................................................................................................................7
2.2 IT MODULES -GENERAL ..............................................................................................................................7
2.3 WIRING............................................................................................................................................................7
3. QUICK START....................................................................................................................................................9
3.1 OVERVIEW......................................................................................................................................................9
3.2 WIRING............................................................................................................................................................9
3.3 MODULE INSTALLATION...............................................................................................................................9
3.4 TRANSMITTER INSTALLATION ....................................................................................................................9
3.5 START-UP & OPERATION .............................................................................................................................9
4. INSTALLATION................................................................................................................................................10
4.1 SENSOR MODULE LOCATIONS.................................................................................................................10
4.2 WIRING..........................................................................................................................................................10
4.3 ENCLOSURE INSTALLATION......................................................................................................................11
4.4 TRANSMITTER AND SENSOR INSTALLATION ..........................................................................................12
4.5 MODULE ADDRESS SWITCH ......................................................................................................................13
5. OPERATION.....................................................................................................................................................18
5.1 DATA ENTRY KEY PAD ................................................................................................................................18
5.2 MAIN MENU...................................................................................................................................................19
5.3 SET-UP..........................................................................................................................................................20
5.4 MAINTENANCE FUNCTIONS.......................................................................................................................23
6. CALIBRATION..................................................................................................................................................24
6.1 CALIBRATION FREQUENCY .......................................................................................................................24
6.2 CALIBRATION PREPARATION ....................................................................................................................24
6.3 CALIBRATION GAS DELIVERY METHODS.................................................................................................24
6.4 CALIBRATION PROCEDURE.......................................................................................................................24
6.5 SENSOR EXPOSURE TO GAS ....................................................................................................................24
6.6 CALIBRATION SUB-MENU...........................................................................................................................25
7. SERVICE...........................................................................................................................................................26
7.1 MODULE SUB ASSEMBLY ...........................................................................................................................26
7.2 ENCLOSURE REPLACEMENT ....................................................................................................................26
7.3 TRANSMITTER REPLACEMENT .................................................................................................................27
7.4 SENSOR REPLACEMENT............................................................................................................................27
7.5 INSTALLATION INSPECTION ......................................................................................................................27

Model 5100-02-IT Combustible Gas Sensor Module
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8. APPENDICES...................................................................................................................................................29
8.1 APPENDIX A: SPECIFICATIONS..................................................................................................................29
8.2 APPENDIX B: MODEL NUMBERS, PARTS LIST &PARAMETERS.............................................................30
8.3 APPENDIX C: LIMITED WARRANTY............................................................................................................31
8.4 APPENDIX D: REMOTE SENSOR OPTION .................................................................................................32
8.5 APPENDIX E: HART......................................................................................................................................33
8.6 APPENDIX F: MODBUS MEMORY MAP ......................................................................................................40
8.7 APPENDIX G: COMBUSTIBLE GAS SCALING FACTORS ..........................................................................41
8.8 APPENDIX H: MENU KEY FOR 5100-02-IT GAS SENSOR MODULE.........................................................42
8.9 APPENDIX I: FM APPROVAL.......................................................................................................................45
8.10 APPENDIX J: SIL-2 APPROVAL CERTIFICATE...........................................................................................47
LIST OF FIGURES
FIGURE 1 - 1: MODEL 5100-02-IT COMBUSTIBLE SENSOR – MOUNTING OPTIONS.................................... 5
FIGURE 1 - 2: MODEL 5100-02-IT COMBUSTIBLE SENSOR – CAST AL ENCLOSURES, DIMENSIONS....... 6
FIGURE 1 - 3: MODEL 5100-02-IT-SS COMBUSTIBLE SENSOR – 316SS ENCLOSURES, DIMENSIONS ..... 6
FIGURE 4 - 1: TYPICAL MOUNTING OPTIONS................................................................................................. 10
FIGURE 4 - 2: TRANSMITTER FACE PLATE ..................................................................................................... 14
FIGURE 4 - 3: 4-20 MA CIRCUITS TYPES 5100-02-IT ...................................................................................... 14
FIGURE 4 - 4: 4-20 MA CIRCUITS TYPES 5100-02-IT – CONNECTIONS........................................................ 15
FIGURE 4 - 6: REMOTE ALARM RESET............................................................................................................ 16
FIGURE 4 - 5: DIGITAL INTERFACE CONNECTIONS ...................................................................................... 16
FIGURE 4 - 7: TERMINATION DRAWING .......................................................................................................... 17
FIGURE 5 - 1: FACE PLATE WITH DATA ENTRY KEY PAD............................................................................. 18
FIGURE 6 - 1: MODEL 5358-01 CALIBRATION ADAPTER ............................................................................... 24
FIGURE 7 - 1: MODULE COMPONENTS ........................................................................................................... 26
FIGURE 8 - 1: REMOTE SENSOR OPTION ....................................................................................................... 32
FIGURE 8 - 2: HART ............................................................................................................................................ 33
FIGURE 8 - 3: 4-20 MA CIRCUITS TYPES 5100-02-IT – CONNECTIONS - HART .......................................... 34
LIST OF TABLES
TABLE 4 - 1: MINIMUM WIRE GAUGES............................................................................................................. 11
TABLE 4 - 2: SENSOR MODULE EXTERNAL INTERFACES ............................................................................ 13
TABLE 4 - 3: SENSOR MODULE ADDRESS SWITCH POSITIONS.................................................................. 13
TABLE 5 - 1: MASTER MENU ............................................................................................................................. 19
TABLE 5 - 2: OPERATION DISPLAY VALUES ................................................................................................... 19
TABLE 5 - 3: SET-UP CONFIGURATION ........................................................................................................... 21
TABLE 5 - 4: MAINTENANCE MENU .................................................................................................................. 23
TABLE 6 - 1: CALIBRATION ................................................................................................................................ 25
TABLE 8 - 1: MODBUS MEMORY MAP .............................................................................................................. 40

Model 5100-02-IT Combustible Gas Sensor Module
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1. PRODUCT DESCRIPTION
1.1 GENERAL
The Model 5100-02-IT Catalytic Bead Combustible Gas Sensor Module is a member of the Sentry
Information Technology ”IT” family of gas sensor transmitter modules. IT modules offer a broad array of
features including:
•Integral Alphanumeric display
•180 day calibration frequency
•SIL-2 Certified
•FM Approved for performance and hazardous locations
•4-20 mA output
•Modbus®RTU interface
•SMC Sentry interface
•316 Stainless steel enclosure option
•Remote alarm reset
•Optional Alarm Relays
•Remote sensor option
IT modules are designed, and approved for installation and operation in hazardous locations.
1.2 PRODUCT CONFIGURATION
Various module configuration options are available. Where applicable, these options are factory configured
prior to shipment.
1.3 THEORY OF OPERATION
Catalytic bead gas sensors detect gas by comparing the resistance of two heated elements. One element is
catalytic to enhance the burning of combustible gases, the other element is passive. Electronic circuits are
used to compare the change in the catalytic bead resistance relative to the passive bead. The relative change
is calibrated to determine the concentration of the gas of interest.
1.4 MODES OF OPERATION
1.4.1 SENTRY INTERFACE
All IT gas sensor modules can be installed on Sierra Monitor Sentry Model 5000 controllers. Catalytic bead
modules communicate as a combustible gas sensor module (Type 2 communication) and are automatically
detected by the Sentry controller. When it is installed in a Sentry system the IT module must have a unique
address which can be established by setting an address between 1 and 8 on the rotary switch accessible
from the cover plate as illustrated in Figure 4-1. Figure 4-4 in this manual provides the wiring terminations
for connections to the Sentry controller.
When the module is operated in conjunction with a Sentry controller, the alarm relay setup (See section
4.3) should be set to “Sentry”, allowing the Sentry controller to manage alarm relay action rather than the
5100-02-IT Gas Sensor Module.
An available option, applicable only to Sentry installations, is a connector card which allows daisy chain
installation using the Sentry multiplex capability. Use of the connector card reduces costs by avoiding the
requirement for wiring junction boxes. The connector card has two sets of connections, allowing for a
continuous run to the next module
®
Registered trademark of Schneider Electric.

Model 5100-02-IT Combustible Gas Sensor Module
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1.4.2 MODBUS OPERATION
An RS-485 Modbus RTU serial interface allows direct connection to standard PLCs and DCSs. The
Module Address Switch (section 4.5) allows the user to select up to 15 different Modbus addresses. Also,
up to 254 different Modbus Addresses are available via menu selection. Figure 4-5 in this manual provides
the wiring terminations for Modbus connections.
1.4.3 ANALOG OPERATION
The analog 4-20 mA interface allows direct connection to standard controller and distributed system. The
module is an active current source.
The standard configuration is set up for a 3-wire non-isolated connection. An optional 4-wire isolated
connection is also available and can be enabled by changing JP1 and JP2.
1.4.4 REMOTE SENSOR (APPENDIX E)
The Remote Sensor option enables the remote mounting of the sensor up to 50’ from the transmitter.
1.4.5 HART CONNECTION (APPENDIX F)
A HART interface option is available. Refer to Appendix F for information.
1.4.6 OPTIONAL INTEGRAL RELAYS
The optional relays are integral to the gas sensor module and are rated as SPDT, 250VAC, 5 Amps for the
High Alarm and Low Alarm relays and SPDT, 250VAC, 2 Amp for the Trouble relay.
* HART option, relays are all SPDT, 250VAC, 2 Amp
If the gas sensor module is provided with the optional relays, it will include Terminal P4 on the interface
board (Figure 4-3). Relay output connections are on P4.
1.4.7 REMOTE ALARM RESET
An input is available for connection of remote alarm reset/acknowledge. Figure 4-6 provides the wiring
termination for connecting the remote alarm reset. This only resets local alarms, not Sentry alarms.
1.5 MECHANICAL
The sensor module of comprised of the following three primary components:
ENCLOSURE
Standard on the 5100-02-IT is an explosion-proof, rain-tight cast aluminum electrical housing (Figure 1-3)
with three ¾” FNPT conduit hubs. The 5100-02-IT-SS has a 316 Stainless Steel enclosure (Figure 1-2).
Both enclosure covers have a viewing window. The design of the enclosure allows 3-way mounting choices
as shown in figure 1-1.
TRANSMITTER ELECTRONICS
Electronic Assembly consisting of one printed circuit board assembly mounted under a cover plate,
plugged into one field termination board. Connectors for wiring for power, signal interface and alarm
relays are located on the bottom of the termination board.
SENSOR ASSEMBLY
The sensor assembly includes an explosion proof housing containing the gas sensor and a wiring harness
for connection to the transmitter. The sensor assembly threads into one hub of the enclosure. The
exposed end of the sensor assembly is threaded to allow connection of a rain-shield or calibration gas.

Model 5100-02-IT Combustible Gas Sensor Module
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1.6 INTERCONNECT WIRING
Not supplied with the sensor module, but necessary to the installation and operation is the multi conductor
wiring which connects the module to its power source and controller. Before this wiring is installed it is
important to read and understand the control system installation instructions to determine wiring alternatives
requirements and alternatives.
1.7 POWER REQUIREMENTS
IT modules operate on DC power between 10 VDC and 30 VDC. Regulated DC power must be supplied from
a separate source, or from an approved Sentry or IT controller.
Figure 1 - 1: Model 5100-02-IT Combustible Sensor – Mounting Options
(Default)

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Figure 1 - 3: Model 5100-02-IT-SS Combustible Sensor – 316SS Enclosures, Dimensions
Figure 1 - 2: Model 5100-02-IT Combustible Sensor – Cast Aluminum Enclosures, Dimensions

Model 5100-02-IT Combustible Gas Sensor Module
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2. CAUTIONS & WARNINGS
2.1 INTRODUCTION
Although IT Transmitter Modules are designed and constructed for installation and operation in industrial
applications including "hostile" environments, caution should be taken to insure that the installation is made in
compliance with this instruction manual and that certain procedures and conditions are avoided. This chapter
discusses the necessary cautions. Read the entire chapter prior to installation of the equipment.
2.2 IT MODULES - GENERAL
Avoid installing sensor modules where they will be unnecessarily exposed to wind, dust, water (esp. direct
hose down), shock, or vibration. Observe temperature range limitations.
Sensors may be adversely affected by prolonged exposure to certain materials. Loss of sensitivity, or
corrosion, may be gradual if such materials are present in low concentrations. These materials include:
silicones, sulfides, Halides (compounds containing chlorine, fluorine, bromine, iodine), acid vapors, caustic
liquids or mists.
Care has been taken by the manufacturer to ship your modules in protective packaging to avoid contamination
prior to installation. It is recommended that the modules remain protected during installation and that the
covering be removed immediately prior to system start-up.
During normal use the sensor is protected from dirt and oil contamination by a sintered metal cover. If this
cover becomes clogged, the response of the sensor will be reduced. Protect the sensor from contamination
by careful placement, or by use of rain and dust shields.
Sensor modules must not be painted. Paint may contain compounds which will contaminate the sensor. Paint
will cause clogging of the sintered metal cover and will cause difficulties during attachment of the calibration
head or other maintenance activity. It is recommended that the module be tagged "DO NOT PAINT".
2.3 WIRING
The manufacturer recommends that extra caution be taken where the installation is near any sources of
electromagnetic or radio frequency interference. Precautions include:
•Avoid running sensor module cable close to high power cables, radio transmission lines, or cables
subject to pulses of high current.
•Avoid running cables near large electric motors or generators.
•Unit is shipped with RF filter that is clipped onto the sensor assembly connector.
•When shielding is used, it is recommended that shields be grounded at the controller and nowhere
else.
•All splices must be via either a termination hardware system or soldered. Improperly spliced cable can
result in corrosion, resistance changes and system errors. The use of wire nuts and crimp-on
connectors is unacceptable.
NOTE
Installation and wiring must be in accordance with the National Electrical Code.
AC Voltage conductors are not to be run in the same conduit as DC voltage
conductors.
2.3.1 CATALYTIC BEAD SENSOR MODULES
Model 5100-02-IT Gas Sensor Modules are FM performance approved for detection of Combustible gas
(methane and hydrogen). The sensor is cross sensitive to the combustible gases indicated in Table 2-1.
Risk management planning should take into consideration the potential for the presence of other gases in
the monitored area.

Model 5100-02-IT Combustible Gas Sensor Module
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Note that the 5100-02-IT has a gas factor scaling feature in which a calibration standard of Methane or
Propane may be used in conjunction with scaling factors to cause alarm function in %LEL scale of another
gas. See Appendix G.
Acetaldehyde 2,3-Dimethylpentane Methyl Chloride
Acetic Acid 2,3-Dimethylpropane Methylcyclohexane
Acetic Anhydride Dimethylsulphide Methylenedichloride
Acetone 1,4-Dioxane Methylethylether
Acetylene Epichlorohydrin Methylethylketone
Alkyl Alcohol Ethane Methyl Formate
Ammonia Ethyl Acetate Methylmercaptan
n-Amyl Alcohol Ethyl Alcohol Methylpropionate
Aniline Ethylamine Methyl n-propylketone
Benzene Ethyl Benzene Napthalene
Biphenyl Ethyl Bromide Nitromethane
1,3-Butadiene Ethyl Chloride n-Nonane
n-Butane Ethylcyclopentane n-Octane
iso-Butane Ethylene n-Pentane
Butene-1 Ethylenedichloride i-Pentane
cis-Butene-2 Ethyleneoxide Propane
trans-Butene-2 Diethyl Ether n-Propyl Alcohol
n-Butyl Alcohol Dimethoxyethane n-Propylamine
iso-Butyl Alcohol Dimethyl Ether n-Propylchloride
tert-Butyl-Alcohol Dimethylformamide Propylene
n-Butyl Benzene Ethyl Formate Propyleneoxide
iso-Butyl Benzene Ethylmercaptan iso-Propylether
n-Butyric Acid n-Heptane Propyne
Carbon Disulfide n-Hexane Toluene
Carbon Monoxide Hydrazine Triethylamine
Carbon Oxysulphide Hydrogencyanide Trimethylamine
Chlorobenzene Hydrogen Vinylethylether
Cyanogen Hydrogen Sulfide o-Xylene
Cyclohexane Methane m-Xylene
Cyclopropane Methyl Actetate p-Xylene
n-Decane Methyl Alcohol JP-4 (Jet Fuel)
Diethylamine Methylamine
Dimethylamine Methyl Bromide
Table 2 - 1: Combustible gases detected by Model 5100-02-IT Combustible Gas Sensor Module

Model 5100-02-IT Combustible Gas Sensor Module
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3. QUICK START
3.1 OVERVIEW
The gas sensor module has been supplied factory calibrated and ready for immediate installation and
operation. An installer familiar with installation and operation of gas detection products can use this section to
begin immediate use of the module.
3.2 WIRING
See section 4.2 to determine if 3-wire or 4-wire operation is necessary.
Provide twisted shielded wiring from the power supply/control device to the sensor module location. Use
stranded wire that is 18 AWG or larger.
3.3 MODULE INSTALLATION
The sensor module can be mounted in a variety of configurations supported by the conduit. See figure 1-1 to
determine which configuration is best for your specific application. The default configuration enables the
modules to be put in line with other modules with the sensor element below the transmitter. To change the
configuration simply remove the transmitter and rotate to the appropriate configuration and remount the
standoffs and transmitter.
The module is designed to be installed on a ¾” conduit. Two important warnings:
•The installation must meet any hazardous environment codes for electrical equipment.
•The sensor module enclosure mounting must be spaced far enough from any vertical surface
to allow removal and replacement of the sensor assembly which is threaded into one ¾”
conduit entry.
•Sensor housing must be oriented vertically pointing downward.
•If module is installed outdoors it is recommended that it be sheltered from direct sunlight.
3.4 TRANSMITTER INSTALLATION
To install the transmitter printed circuit assembly into the housing, carefully turn the faceplate so that the
printing is in the correct horizontal position for the mounting configuration and slide the assembly over the two
stand-offs in the enclosure.
Hand tighten the two captive panel thumb screws into the stand-offs. Replace the enclosure cover prior to
providing power to the transmitter
•If the transmitter is installed in a classified hazardous area, replace the threaded cover prior to
providing power.
3.5 START-UP & OPERATION
To begin operation of the sensor module activate the instrument loop with 10-30 VDC. Each time the sensor
module is powered up it will perform a warm-up for approximately 5-10 minutes. During this time the display
will read “Starting”. The loop output will be held at 4 mA.
NOTE: If the sensor is uncalibrated, the startup display will state “START” instead of “STARTING”
After the warm-up period has expired, the display will indicate the gas concentration. Also, the instrument loop
will be released to output current in the range of 4 to 20 mA. The actual current is linear with the gas
concentration.

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4. INSTALLATION
NOTE
All IT modules are factory pre-configured and calibrated.
All modules are tagged to indicate the configuration including the sensor module number
Identify all components during unpacking and install using the factory configuration.
4.1 SENSOR MODULE LOCATIONS
Select locations for each sensor modules based on the following:
•Modules should be placed close to the potential source of gas.
•Modules should be placed in areas accessible for calibration.
•Sensors should be pointed down and the conduit should include an inverse trap to reduce moisture
(condensation) from accumulating in the electronics enclosure.
•Remote calibration fitting (5360-00) should be used to facilitate calibration gas delivery. Run
polyurethane tubing (1/4” O.D. x 1/8” I.D.) from fitting to an accessible location.
NOTE
Module must always be installed vertically with sensor pointing down.
4.2 WIRING (Figure 4-2 refers to Analog, Modbus and Sentry operation)
4.2.1 ANALOG 4-20 MA OPERATION
The 4-20 mA output for the 5100-02-IT can be either 3-wire (ISA Type 3 Circuit) or standard (ISA Type 4
Circuit 4-wire) operation. If using 3-wire operation, use a minimum of 18 AWG, shielded, 3-conductor cable
up to 2000’. For 4-wire operation, use a minimum of 2 each, 18 AWG, twisted, shielded, pair up to 2000’.
Figure 4 - 1: Typical Mounting Options

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4.2.2 MODBUS OPERATION USING RS-485 CONNECTION
Use a minimum of 18 AWG, 2 conductor for DC power connection. No shield required. In addition use a
minimum of 24 AWG, low capacitance, shielded data cable for RS485 half duplex communication. The
installation may be planned in a manner which provides up to 32 sensor modules on a single home run.
TERMINATION RESISTOR JUMPERS:
Termination resistors are used in RS-485 wire runs to provide impedance matching. The IT series
modules use a 120 Ohm resistor for this function. The cable being used for this RS-485 connection must
have a minimum of 100 Ohm impedance with a maximum of 120 Ohms.
Installations where the cable length is under 100’, termination resistors may not be required. In
installations where the cable length is greater than 100’, it is recommended to place the termination
jumpers on the first device and last device on the RS-485 wire run. Termination jumpers must be removed
from all other modules connected between the first and last device. The first device in the RS-485
multiplexed bus is usually a gas controller or PLC. Factory term resistor setting is “not enabled.”
BIAS JUMPERS: (BIAS A, BIAS B)
Bias resistors are used to force RS-485 receiver outputs to a known (fail-safe) state, when the bus is idle.
Bias jumpers are always installed in pairs as the bias must be placed on both the TX A and TX B lines.
Sierra Monitor’s IT series of combustible gas sensors automatically apply the bias jumpers, and are factory
installed so that the bias is always enabled.
4.2.3 SENTRY OPERATION USING SENTRY PSG CONNECTION
Use a minimum of 18 AWG, 3-conductor cable up to 2000’. The cable may or may not be shielded. We
recommend shielded cable in circumstances that there could be RF or EM interference present. Shield to
be terminated and grounded only at the Sentry controller. Shield must be cut and dressed at the module
end so that no part of it comes in contact with the conduit or ground.
NOTE:
Be sure to follow all local electric code and safety requirements when installing the 5100-02-IT Gas Sensor Module
4.2.4 GENERAL
Install conduit as required by local code or construction specifications. Provide for splice boxes where
multiple modules will be wired to a single run. Pull conductors of the correct gauge wire from the controller
to each splice box and from the respective splice box to each planned module location. See for proper
wire termination in the splice box. Twisted wire secured with wire nuts is not an acceptable splice.
NOTES
RFI Noise Suppressor must be added to power/ground as per Appendix D.
The drain wire of shielded cable must NOT be used as one of the conductors.
Installation and wiring must be in accordance with the National Electrical Code. Temperature
rating of cable wire must be at least 75oC. If cable runs through higher temperature
environments, it must be specified for that environment.
4.3 ENCLOSURE INSTALLATION
To protect the transmitter and sensor assembly they should be removed from the enclosure and preserved
until final installation and wiring termination.
Number
of
modules
Maximum length of wire run (feet)
500 1,000 2,000 3,000 5,000
1 18 18 16 16 14
2 18 18 14 12 xx
3 18 16 12 xx xx
4 16 14 12 xx xx
Table 4 - 1: Minimum Wire Gauges

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Prior to installation and wiring.
1. Remove the transmitter from the module housing by:
•Unscrew the two captive panel screws in the face plate.
•Lift the transmitter out of the enclosure housing.
•Unplug the sensor cable from transmitter assembly connector J1.
•Remove the sensor assembly from the enclosure hub.
2. Install the module housing onto the end of the supply conduit and/or bolt into position as required.
NOTES
When housing earth grounding is required for the installation a grounding lug is located in the
base of the enclosure. Install the earth ground wire under the green lug.
4.4 TRANSMITTER AND SENSOR INSTALLATION
When all pre-wire is complete:
1. Install sensor assembly in the open hub on the module enclosure. The sensor assembly thread
must be fully seated into the hub and tightened to maintain explosion proof assembly.
2. Connect the sensor assembly cable to top transmitter board connector J1.
3. Align the headers between the top transmitter board and the lower termination board and push
together.
4. Turn rotary switch to correct sensor address if required.
5. Carefully return the transmitter to the enclosure installing it over the two stand-off’s. Tighten the
retaining screws into the stand-offs.
6. Cycle power to accept module address change.
P1 PCB Label Function
1 Switch IN + Digital Input SW +
2 IN - Digital Input SW -
3 4-20
IN + 4-20 mA Input +
4 IN - 4-20 mA Input -
5 GND Ground
6 4-20 OUT + 4-20 mA Output
7 OUT - 4-20 mA Output
P2 PCB Label Function
1
RS 485
+ RS 485 (+) (A)
2 - RS 485 (-) (B)
3 S RS 485 shield (Isolated GND)
4
RS 485
+ RS 485 (+) (A)
5 - RS 485 (-) (B)
6 S RS 485 shield (Isolated GND)
P3B PCB Label Function
1 P VDC Power
2 S Sentry Signal or Communication
3 G VDC Ground
P3A
4 P VDC Power
5 S Sentry Signal or Communication
6 G VDC Ground

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P4 Connections are only available when the optional Relays are included
P4 PCB Label Function
1
WARN
N/C Low Alarm Relay NC
2 COM Low Alarm Relay COM
3 N/O Low Alarm Relay NO
4
ALARM
N/C High Alarm Relay NC
5 COM High Alarm Relay COM
6 N/O High Alarm Relay NO
7
TRBL
N/C Trouble Alarm Relay NC *
8 COM Trouble Alarm Relay COM*
9 N/O Trouble Alarm Relay NO*
* Trouble relay is fail safe so it is energized for normal operation,
functions are labeled for normal operation.
Table 4 - 2: Sensor Module External Interfaces
7. Establish the module address according to section 4.5.
NOTES
The starting delay period normally takes approximately 3 minutes but under some
circumstances can take longer.
4.5 MODULE ADDRESS SWITCH
For digital interface applications the module address switch (or Modbus node) must be set per Table 4-2:
POSITION ADDRESS POSITION ADDRESS
1 Sensor 1 9 Sensor 09
2 Sensor 2 A Sensor 10
3 Sensor 3 B Sensor 11
4 Sensor 4 C Sensor 12
5 Sensor 5 D Sensor 13
6 Sensor 6 E Sensor 14
7 Sensor 7 F Sensor 15
8 Sensor 8 0 Software Menu
Table 4 - 3: Sensor Module Address Switch
Positions
NOTE
For Sentry applications only sensor addresses 1-8 are allowed. If using Modbus output sensor
addresses 1-15 are available. Position 0 allows the Modbus Address to be set by software
menu, in the range 16-254.

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Figure 4 - 2: Transmitter Face Plate
Figure 4 - 3: 4-20 mA Circuits Types 5100-02-IT

Model 5100-02-IT Combustible Gas Sensor Module
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7
Figure 4 - 4: 4-20 mA Circuits Types 5100-02-IT – Connections
(DEFAULT)

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+
-
Figure 4 - 5: Digital Interface Connections
Figure 4 - 6: Remote Alarm Reset

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Figure 4 - 7: Termination Drawing

Model 5100-02-IT Combustible Gas Sensor Module
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5. OPERATION
The Combustible Gas Sensor utilizes a visual menu system operated by means of a magnet. A magnet stick is
supplied for this purpose. The menu system is used to configure alarm set-points, calibrate the sensor
module, and for maintenance procedures and alarms acknowledge.
5.1 DATA ENTRY KEY PAD
The module menu system is operated by means of directing the magnet stick toward each of four independent
hall-effect magnetic switches. Each switch functions as if it is a manually activated panel key. The keys are
located above and below the faceplate display and are labeled M, E, ▲, and ▼as shown in Figure 5-1.
•Key M: MODE
•Key E: ENTER
•Key ▲: UP (+)
•Key ▼: DOWN (-)
Mode
U
p
Ente
r
Down
Figure 5 - 1: Face Plate with Data Entry Key Pad