MSA SMC 5100-99-IT User manual

Operating Manual
SMC 5100-99-IT Transmitter
Document No./Revision:T12005/B2
Print Spec: 10000005389 (F)
MSAsafety.com

© MSA 2023. 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
1000 Cranberry Woods Drive
Cranberry Township, PA 16066 USA
Customer Service / Tech Support:
[phone] Option 1
Email: [email protected]
For your local MSA contacts, please go to our website www.MSAsafety.com

Contents
1 Product Description 5
1.1 General 5
1.2 Product Configuration 6
1.3 Modes of Operation 6
1.3.1 Classic Sentry Interface 6
1.3.2 Modbus Operation 6
1.3.3 Analog Output Operation 6
1.3.4 Analog Input Operation 6
1.3.5 Remote Alarm Reset 6
1.3.6 Optional Integral Relays 6
1.4 Mechanical 7
1.4.1 Enclosure 7
1.4.2 Transmitter Electronics 8
1.5 Interconnect Wiring 8
1.6 Power Requirements 8
2 Cautions & Warnings 9
2.1 Introduction 9
2.2 IT Transmitters – General 9
2.3 Wiring Warnings 9
3 Installation 10
3.1 Transmitter Locations 10
3.2 Wiring 10
3.2.1 4-20 mA Analog Output Operation 10
3.2.2 4-20 mA Analog Input 10
3.2.3 Modbus Operation Using RS-485 Connection 10
3.2.4 Sentry Operation Using Sentry Connection 11
3.2.5 General 11
3.3 Enclosure Installation 11
3.4 Transmitter Installation 12
3.5 Module Address Switch 13
4 Operation 20
4.1 Introduction 20
4.2 Data Entry Keypad 20
4.3 Main Menu 21
4.4 Set-Up 22
4.4.1 Alarms 22
4.4.2 Relays 22
4.4.3 Range 22
4.4.4 4-20mA 22
4.4.5 RS-485 23
4.4.6 DigInput 23
4.5 Maintenance Sub-Menu 26
5 Service 28
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5.1 Transmitter Configuration 28
5.2 Enclosure Replacement 28
5.3 Transmitter Replacement 28
5.4 Installation Inspection 28
5.4.1 Controller Installation 28
5.4.2 Moisture Traps and Rainshields 28
5.4.3 Standard Voltages 28
5.5 Inspection and Troubleshooting Guide 29
5.5.1 If Transmitter Does Not Respond to Gas 29
5.5.2 Module Displays “Starting” for more than 1 Hour 29
5.5.3 Module Does Not Display the Correct %PPM / output 29
5.5.4 Display Shows ‘F’ – Sensor Missing or Bad Sensor 29
5.5.5 Display Shows “H” or “L” 29
5.5.6 Display Shows “C” – Calibration Mode 29
5.5.7 Display Shows “S” – Sentry Connection 29
5.5.8 Diagnostic LEDs 29
5.5.9 Error Messages 30
6 Specifications 31
7 Model Numbers & Spare Parts 32
8 Limited Warranty 33
9 Modbus Memory Map 34
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1 Product Description
1.1 General
The Model 5100-99-IT transmitter is a member of the IT Series family of gas sensor transmitters and it offers a broad array
of features including:
• Integral alphanumeric LED display
• Optional integral alarm relays
• Analog 4-20 mA input/output
• Modbus®RTU interface
NOTE:Modbus is a registered trademark of Schneider Electric
• SMC Sentry interface
• 316 Stainless steel enclosure option
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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 Modes of Operation
1.3.1 Classic Sentry Interface
IT gas sensor modules can be installed on 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 3.5 Module Address Switch. This
section also provides the wiring terminations for connections to the Sentry controller.
When the module is operated in conjunction with a Sentry controller, the alarm relay set-up (Section 4.3 Main Menu) should
be set to “Sentry”, allowing the Sentry controller to manage alarm relay action rather than the transmitter.
1.3.2 Modbus Operation
An RS-485 Modbus RTU serial interface allows direct connection to standard PLCs and DCSs. The Module Address Switch
(Section 3.5 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 3.5 Module Address Switch provides the wiring terminations
for Modbus connections.
1.3.3 Analog Output Operation
The 4-20 mA analog output 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 3.5 Module Address Switch)
1.3.4 Analog Input Operation
The 4-20 mA analog input interface offers 4-20 mA current loop transmitters Modbus and Classic Sentry interfaces.
The standard configuration is a 2-wire input. 3-wire and 4-wire connections can also be accommodated (Section 3.5 Module
Address Switch)
1.3.5 Remote Alarm Reset
An input is available for connection of remote alarm reset. Section 3.5 Module Address Switch provides the wiring
termination for connecting the remote alarm reset. This only resets local alarms, not Sentry alarms.
1.3.6 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, 0.25 Amp for the Trouble relay.
If the gas sensor module is provided with the optional relays, it will include Terminal P4 on the interface board (Section 3.5
Module Address Switch). Relay output connections are on P4.
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1.4 Mechanical
The transmitter is comprised of the following three primary components:
1.4.1 Enclosure
Standard on the 5100-99-IT is a cast aluminum electrical housing with three ¾” FNPT conduit hubs. The 5100-99-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.
Model 5100-99-IT-S1/S2 Toxic Gas Sensor – Stainless Steel Enclosure, Dimensions
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Model 5100-99-IT-AL Transmitter – Cast Aluminum Enclosure, Dimensions
1.4.2 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 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.
1.6 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 is 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 IT Transmitters – 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.
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.
• Relays are not to be used for safety critical functions.
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.
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3 Installation
3.1 Transmitter Locations
Select locations for each transmitter so that they are placed in areas accessible for calibration.
3.2 Wiring
3.2.1 4-20 mA Analog Output 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 3.5 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 3.5
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 3.5 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 3.5 Module Address Switch.
3.2.2 4-20 mA Analog Input
When using a 2-wire connection, a minimum of an 18AWG, 2 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 3.5 Module Address Switch.
3.2.3 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 RS-485 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 RS-485 Settings are: 38,400 baud, 8 bits, 1 stop bit, no parity
Termination Resistor Jumper
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 jumper 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. The IT series of toxic gas sensors
automatically apply the bias jumpers, and are factory installed so that the bias is always enabled.
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3.2.4 Sentry Operation Using Sentry Connection
See Section 3.5 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 5100-99-IT
Transmitter.
3.2.5 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.
3.3 Enclosure Installation
To protect the transmitter, it should be removed from the enclosure and preserved until final installation and wiring
termination.
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 transmitter.
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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3.4 Transmitter Installation
Establish the module address according to Section 3.5 Module Address Switch.
P1 PCB Label Function
1Switch IN + Digital Input SW +
2 IN - Digital Input SW -
34-20 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
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 is normally approx. 3 minutes but in some circumstances may take longer.
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3.5 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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Analog Output Circuit Types
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Analog Output, 4-20 mA Circuit Type Connections for 5100-99-IT
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Analog Input Connection Options for 5100-99-IT
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Wiring Connections for Modbus and Sentry PSG Interface
5100-XX-IT TO MODBUS DEVICE
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Wiring Connections for Remote Alarm Reset
5100-XX-IT Remote Alarm Reset (Unsupervised)
(dry contact only unpowered)
5100-XX-IT Remote Alarm Reset (Supervised)
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4 Operation
4.1 Introduction
The Transmitter utilizes a visual menu system operated by means of a magnet. A magnetic tool (5358-50) 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.
4.2 Data Entry Keypad
The transmitter 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 under the faceplate
above and below the LED display and are labeled M, E, ▲ and ▼ as shown below.
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