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When the module is operated in conjunction with a Sentry controller, the alarm relay setup (See section 5.3) 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) allows the user to select up to 15 different Modbus addresses. Also, an additional 254 Modbus addresses are available via menu selection. Figure 4-7 in this manual 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. (Figure 4.6) 1.4.4 REMOTE SENSOR (APPENDIX D) The Remote Sensor option can be used to remotely mount the sensor up to 15’ 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 REMOTE ALARM RESET An input is available for connection of remote alarm reset/acknowledge. Figure 4-8 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, 250 VAC, 0.25 Amp for the Trouble relay. * HART option alarm relays are all SPDT, 250VAC, 2 Amp, Trouble = 0.25 Amp If the gas sensor module is provided with the optional relays, it will include Terminal P4 on the interface board (Figure 4-3 and 4-4). Relay output connections are on P4. Page: 2 Model 5100-XX-IT Toxic Gas Sensor Module 1.5 MECHANICAL The sensor module is comprised of the following three primary components: • ENCLOSURE Standard on the 5100-XX-IT is an explosion-proof, rain-tight cast aluminum electrical housing (Figure 1-3) with three .” FNPT conduit hubs. The 5100-XX-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 1-3. • 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. 1.6 INTERCONNECT WIRING Not supplied with the sensor module, but necessary to the installation and operation is the two conductor wiring shielded 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 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. Page: 3 Model 5100-XX-IT Toxic Gas Sensor Module Effective November 2012 a new enclosure is being used for the Model 5100-XX-IT-A1. Refer to Appendix K for dimension drawings. Figure 1 - 1: Model 5100-05-IT-A2 Toxic Gas Sensor Module Aluminum – Dimensions (Valid for all except 5100-25/26-IT – See Appendix G) Figure 1 - 2: Model 5100-05-IT-S1(and S2) Toxic Gas Sensor Module Stainless Steel – Dimensions (Valid for all except 5100-25/26-IT – See Appendix G) Page: 4 Model 5100-XX-IT Toxic Gas Sensor Module Figure 1 - 3: Model 5100-XX-IT Toxic Gas Sensor Module – Mounting Options NOTE Module installation must be such that it is mounted vertical with sensor pointing downward. Page: 5 Model 5100-XX-IT Toxic Gas Sensor Module 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 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 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 vibratio...

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