MSA SMC 5100-IT Series User manual

Operating Manual
SMC 5100-XX-IT Toxic Gas Detector Module
Document No./Revision:T12020/E3
Print Spec: 10000005389 (F)
MSAsafety.com

© MSA 2021. All rights reserved
WARNING!
Read this manual carefully before using or maintaining the device. The device will perform as designed only if it is used and
maintained in accordance with the manufacturer's instructions. Otherwise, it could fail to perform as designed, and persons
who rely on this device could sustain serious injury or death.
The warranties made by MSA with respect to the product are voided if the product is not installed and used in accordance
with the instructions in this manual. Please protect yourself and your employees by following the instructions.
Please read and observe the WARNINGS and CAUTIONS inside. For additional information relative to use or repair, call
1-800-MSA-2222 during regular working hours.
MSA is a registered trademark of MSA Technology, LLC in the US, Europe and other Countries. For all other trademarks
visit https://us.msasafety.com/Trademarks.
MSA Safety
1991 Tarob Court
Milpitas, CA 95035
U.S. Support Information:
[phone]
[phone]
Email: [email protected]
EMEA Support Information:
[phone]
Email: [email protected]
For your local MSA contacts, please go to our website www.MSAsafety.com

Contents
1 Product Description 6
1.1 General 6
1.2 Product Configuration 7
1.3 Theory of Operation 7
1.4 Modes of Operation 7
1.4.1 Classic Sentry Interface 7
1.4.2 Modbus Operation 7
1.4.3 Analog Operation 7
1.4.4 Remote Sensor 7
1.4.5 HART Connection 8
1.4.6 Remote Alarm Reset 8
1.4.7 Optional Integral Relays 8
1.5 Mechanical 8
1.5.1 Enclosure 8
1.5.2 Transmitter Electronics 10
1.5.3 Sensor Assembly 10
1.6 Interconnect Wiring 10
1.7 Power Requirements 10
2 Cautions & Warnings 11
2.1 Introduction 11
2.2 Gas Sensor Modules – General 11
2.3 Wiring Warnings 11
2.4 Calibration Frequency 11
3 Quick Start 12
3.1 Overview 12
3.2 Wiring 12
3.3 Module Installation 12
3.4 Transmitter Installation 12
3.5 Startup and Operation 12
3.6 Zero Stabilization 12
4 Installation 13
4.1 Sensor Module Locations 13
4.2 Wiring 14
4.2.1 Analog 4-20 mA Operation 14
4.2.2 Modbus Operation Using RS-485 Connection 14
4.2.3 Sentry Operation Using Sentry Connection 14
4.2.4 General 15
4.3 Enclosure Installation 15
4.4 Transmitter and Sensor Installation 16
4.5 Module Address Switch 18
5 Operation 24
5.1 Introduction 24
5.2 Data Entry Keypad 24
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5.3 Main Menu 25
5.4 Set-Up 27
5.5 Maintenance Sub-Menu 30
6 Calibration 32
6.1 Calibration Frequency 32
6.2 Calibration Preparation 32
6.3 Calibration Gas Delivery Methods 32
6.4 Sensor Exposure to Gas 33
6.5 Calibration Sub-Menu 33
6.5.1 5100-03-IT Oxygen Deficiency 34
6.5.2 5100-88-IT Carbon Dioxide 34
7 Service 35
7.1 Sensor Module Configuration 35
7.2 Enclosure Replacement 35
7.3 Transmitter Replacement 36
7.4 Sensor Replacement 36
7.5 Installation Inspection 37
7.5.1 Controller Installation 37
7.5.2 Cabling Installation 37
7.5.3 Sensor Module Installation 37
7.5.4 Moisture Traps and Rainshields 37
7.5.5 Standard Voltages 37
7.6 Inspection and Troubleshooting Guide 37
7.6.1 Module Displays “Starting” for more than 1 Hour 38
7.6.2 Module Does Not Display the Correct %PPM 38
7.6.3 Display Shows ‘F’ – Sensor Missing or Bad Sensor 38
7.6.4 Module Shows “***Calibration Required***” 38
7.6.5 Display Shows “H” or “L” 38
7.6.6 Display Shows “M” – Not Calibrated 38
7.6.7 Display Shows “C” – Calibration Mode 38
7.6.8 Display Shows “S” – Sentry Connection 38
7.6.9 Diagnostic LEDs 38
7.6.10 Error Messages 39
8 Specifications 40
9 Parts List 45
10 Limited Warranty 47
11 Remote Sensor Drawing 48
12 Modbus Memory Map 50
13 HART 51
14 Gas Sensor Module Calibration 62
14.1 Calibration for 5100-25-IT 62
14.2 Calibration for 5100-26-IT 66
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15 5100-88-IT Dimensions 67
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1 Product Description
1.1 General
The Model 5100-XX-IT Toxic Gas Sensor Module is a smart transmitter and member of the IT Series family and it offers a
broad array of features including:
• Integral alphanumeric LED display
• Up to 180 day calibration frequency
• Model 5100-05-IT FM approved
• Suitable for SIL-2 service
• Optional integral alarm relays (3)
• 4-20 mA output
• Modbus®RTU interface
NOTE:Modbus is a registered trademark of Schneider Electric
• SMC Sentry interface
• Optional HART interface
• 316 Stainless steel enclosure option
• Remote sensor option
• Low maintenance and operation costs
Members of the 5100-XX-IT Series Toxic Gas family include:
• 5100-03-IT Oxygen Gas Sensor Module
• 5100-04-IT Carbon Monoxide Gas Sensor Module
• 5100-05-IT Hydrogen Sulfide Gas Sensor Module
• 5100-06-IT Chlorine Gas Sensor Module
• 5100-08-IT Chlorine Dioxide Gas Sensor Module
• 5100-10-IT Sulfur Dioxide Gas Sensor Module
• 5100-12-IT Nitrogen Dioxide Gas Sensor Module
• 5100-25-IT Ammonia Gas Sensor Module
• 5100-26-IT Hydrogen Fluoride Gas Sensor Module
• 5100-88-IT Carbon Dioxide Gas Sensor Module
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1.2 Product Configuration
Various module mounting configurations can be implemented without special fixtures. Where applicable, these options are
factory configured prior to shipment. Mounting configuration can be selected by the installer or field technician and are fully
described in this manual. Sensor must always be oriented downward.
1.3 Theory of Operation
Electrochemical sensors are fuel cell-like devices consisting of an anode, cathode, and electrolyte. The components of the
cell are selected so a subject gas, allowed to diffuse into the cell, will cause a chemical reaction and generate a current. The
cells are diffusion limited so the rate the gas enters the cell is solely dependent on the gas concentration. The current
generated is proportional to the rate of consumption of the subject gas in the cell.
Sierra Monitor electrochemical sensors provide improved reliability by allowing the gas to diffuse into the sensor through a
capillary port, rather than diffusing through membranes. The result is an extremely stable sensor with very low temperature
and pressure coefficients and the capability to monitor gas as ppm.
1.4 Modes of Operation
1.4.1 Classic Sentry Interface
IT gas sensor modules can be installed on Sierra Monitor Sentry Model 5000 controllers Ver. 6.XX MFD after 9/1/95. 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 Module Address Switch accessible from the cover plate as illustrated in Section 4.5 Module Address
Switch. Section 4.5 Module Address Switch also provides the wiring terminations for connections to the Sentry controller.
NOTE:The Model # 5100-88-IT CO2 gas sensor module range is 0-5000 ppm. Therefore, the Sentry Controller
must be configured for a 0-100 % full scale input. The Sentry cannot display engineering units up to 5000. The
alarm set points need to be set as a percentage of full scale. For example, a 2500 ppm alarm set point is equal
to 50% scale.
When the module is operated in conjunction with a Sentry controller, the alarm relay set-up (Section 5.3 Main Menu) should
be set to “Sentry”, allowing the Sentry controller to manage alarm relay action rather than the 5100-XX-IT Gas Sensor
Module.
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 Module Address Switch) allows the user to select up to 15 different Modbus addresses.Also, an additional 254
Modbus addresses are available via menu selection. Section 4.5 Module Address Switch provides the wiring terminations
for Modbus connections. The 5100-XX-IT 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. (Section 4.5 Module Address Switch)
1.4.4 Remote Sensor
The Remote Sensor option can be used to remotely mount some sensors up to 15’ from the transmitter. Refer to Section 11
Remote Sensor Drawing for allowable distances.
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1.4.5 HART Connection
A HART interface option is available. Refer to Section 13 HART for information.
1.4.6 Remote Alarm Reset
An input is available for connection of remote alarm reset. Section 4.5 Module Address Switch provides the wiring
termination for connecting the remote alarm reset. This only resets local alarms, not Sentry alarms.
1.4.7 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, 0.25 Amp for the Trouble relay.
* HART option alarm 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 (Section 4.5
Module Address Switch). Relay output connections are on P4.
1.5 Mechanical
The sensor module is comprised of the following three primary components:
1.5.1 Enclosure
Standard on the 5100-XX-IT is a cast aluminum electrical housing with three ¾” FNPT conduit hubs. The 5100-XX-IT-S has
a 316 Stainless Steel enclosure. Both enclosure covers have a viewing window. The design of the enclosure allows 3-way
mounting choices as shown below.
NOTE:Module installation must be such that it is mounted vertically with sensor pointing downward.
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Model 5100-05-IT-S1/S2 Toxic Gas Sensor – Stainless Steel Enclosure, Dimensions
Model 5100-05-IT-A1/A2 Toxic Gas Sensor – Cast Aluminum Enclosure, Dimensions
NOTE:These dimensions are valid for all except 5100-25/26-IT.
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1.5.2 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.
1.5.3 Sensor Assembly
The sensor assembly includes an Aluminum or Stainless Steel 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.
1.6 Interconnect Wiring
Not supplied with the sensor module, but necessary to the installation and operation is the shield cable 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 requirements and alternatives.
1.7 Power Requirements
The modules operate on 24 VDC power between 10 VDC and 30 VDC. Filtered, regulated DC power must be supplied from
a separate source or from an approved Sentry or IT controller.
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2 Cautions & Warnings
2.1 Introduction
Although the IT Transmitter Modules are designed and constructed for installation and operation in industrial applications
including “hostile” environments, caution should be taken to ensure 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 Gas Sensor Modules – General
Avoid installing sensor modules where they will be unnecessarily exposed to wind, dust, water (i.e. 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: Halides (compounds containing
chlorine, fluorine, bromine, iodine), acid vapors, caustic liquids or mists.
Care has been taken by the manufacturer to ship 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 O2, CO, and H2S sensors are 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 shields 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 Warnings
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.
• When the sensor module is to be operated in analog (4-20mA output) mode shielded cable is required.
• 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. Voltage AC conductors
are not to be run in the same conduit as voltage DC conductors.
2.4 Calibration Frequency
The H2S calibration frequency is six months or 180 days. However, prudent gas detector maintenance practices normally
suggest a simple recalibration following incidences of exposure to high levels of gas that would lead to alarm activation
within any system utilizing the output of the 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 Wiring to determine if 3-wire or 4-wire operation is necessary.
Provide two conductor twisted shielded wiring from the power supply/control device to the sensor module location. Use wire
that is 18 AWG or larger.
3.3 Module Installation
The sensor can be mounted in a variety of configurations supported by the conduit. See Section 1.5.1 Enclosure 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” NPT or M20 conduit. During installation heed the following:
• 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.
3.5 Startup and 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 1.0 minutes (60 seconds). 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 “UNCALIB” instead of “STARTING”.
NOTE:All ITmodules require 300 seconds warm-up period. 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 and depends on the selected range. For
instance, when the range of 0 to 50 PPM has been selected, a current of 4 mA corresponds to 0 PPM and a
current of 20 mA corresponds to 50 PPM.
3.6 Zero Stabilization
All electrochemical sensors require at least 30 minutes on power prior to calibration. This allows the electrode potentials to
equilibrate, resulting in a stable zero signal level.
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4 Installation
4.1 Sensor Module Locations
Model Gas Gas Density
N/A Air 1.00
5100-04-IT CO 0.97
5100-05-IT H2S 1.19
5100-06-IT Cl22.49
5100-08-IT ClO23.09
5100-10-IT SO22.26
5100-12-IT NO22.12
5100-25-IT NH30.60
5100-26-IT HF 1.86
5100-88-IT CO21.53
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.
The gas sensor module utilizes a diffusion type sensor which should be located close to either the expected source or
destination of the gas hazard. If the gas is heavier than air, the sensor module should be installed within 24 inches of the
ground or floor. If it is lighter than air, move it above 6’.
After optimum locations are determined based on the above recommendations, consideration should be given to placing the
sensor modules in locations which are accessible for calibration service. Slight adjustments to the location of the sensor
module may have little impact on effectiveness but major effect on accessibility.
• 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.
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4.2 Wiring
4.2.1 Analog 4-20 mA Operation
For a 3-wire non-isolated connection, set jumpers, located on the bottom of the transmitter board, to the lower position as
illustrated in Section 4.5 Module Address Switch. Verify that both jumpers are in the position marked by 3-wire. When using
a 3-wire connection, a minimum of an 18 AWG, 3-conductor shielded cable must be used. A cable shield must never be
used as a conductor. Larger gauge wire is recommended with distances over 1000’. Connect wires as shown in Section 4.5
Module Address Switch.
For a 4-wire isolated connection, set jumpers, located on the bottom of the transmitter board, to the upper position as
illustrated in Section 4.5 Module Address Switch. Verify that both jumpers are in the position marked by 4-wire. When using
a 4-wire connection, a minimum of 2 each of an 18 AWG, 2 conductor twisted/shielded pair cable must be used. A cable
shield must never be used as a conductor. Larger gauge wire is recommended with distances over 1000’. Connect wires as
shown in Section 4.5 Module Address Switch.
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.
Standard default RS485 Settings are: 38,400 baud, 8 bits, 1 stop bit, no parity
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 toxic 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 Connection
See Section 4.5 Module Address Switch. 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-XX-IT Gas
Sensor Module.
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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.
NOTE: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
75°C. 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
Prior to installation and wiring complete the following steps.
1. Remove the transmitter from the module housing by:
a. Unscrew the two captive panel screws on the faceplate.
b. Lift the transmitter out of the enclosure.
c. Unplug the sensor cable from transmitter connector P2.
d. Remove the sensor assembly from the enclosure hub.
2. Install the module enclosure onto the end of the supply conduit and/or bolt into position as required.
3. For hazardous locations an Explosion poof seal fitting must be installed within 18" of the detector.
NOTE:When enclosure earth grounding is required for the installation a grounding lug is located in the base of
the enclosure. Install the earth ground under the green ground screw.
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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 wires which return to the controller to interface board connectors P1, P2, P3 and P4 according to
Section 4.5 Module Address Switch and as detailed in the connector tables below.
3. Connect the sensor assembly cable to top transmitter board connector P2.
4. Align the headers between the top transmitter board and the lower interface board then push together.
5. Turn the rotary switch to correct sensor address if required.
6. Carefully return the transmitter to the enclosure, installing it over the two stand-off’s. Tighten the retaining screws into
the stand-offs.
7. Cycle power to accept module address change.
8. Establish the module address according to Section 4.5 Module Address Switch.
P1 PCB Label Function
1Switch 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
64-20 OUT + 4-20 mA Output +
7 OUT - 4-20 mA Output -
P2
1
RS 485
+ RS 485 (+) (A)
2 - RS 485 (-) (B)
3 S RS 485 shield (Isolated GND)
4 + RS 485 (+) (A)
5 - RS 485 (-) (B)
6 S RS 485 shield (Isolated GND)
P3B
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* PCB Label Function
1
WARNING
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
* P4 Connections are installed only when the optional Relays are included
** Trouble relay is a fail-safe so it is energized for normal operation, functions are labeled for normal operation.
NOTE:The starting delay period normally takes approximately 3 minutes but under some circumstances can
take longer. For optimum performance, it is recommended that a calibration be performed after 24 hours of
operation.
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4.5 Module Address Switch
For digital interface applications the module address switch (or Modbus node) must be set per the table below.
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
NOTE:Use selector switch to pick Sentry PSG addresses 1 through 8 only. 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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Interface Board Connectors
RS-485 – Termination, BIAS Jumper
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mA Circuit Types
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