Univex 5100-02-IT, IT Series Installation, 3.1SENSOR MODULE LOCATIONS, 3.2WIRING, Page

Model 5100-02-IT Combustible Gas Sensor Module

3. 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.

3.1SENSOR MODULE LOCATIONS

Select locations for each sensor module 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) can 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.

3.2WIRING

3.2.1ANALOG 4-20 MA OPERATION

The 4-20 mA output for the 5100-02-IT can be either 3-wire (using the 5394-61 Connector Board) or 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’.

3.2.2MODBUS 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.

3.2.3SENTRY OPERATION USING SMC SENTRY 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

3.2.4 GENERAL

Install conduit as required by local code or construction specifications. When sensor modules are to be multiplexed for Sentry or RS-485 communication two alternatives may be planned:

•Install splice boxes above each sensor module. Use multi-position positive contact terminals to connect daisy chain wiring and provide a pigtail to connect to the sensor module transmitter board.

•Use Auxiliary Connection Assembly, Model 5394-61. The Auxiliary Connection Assembly plugs into the sensor module transmitter and provides daisy chain wiring.

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 75oC. If cable runs through higher temperature

environments, it must be specified for that environment.

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