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Model 5100-28-IT Combustible Gas Sensor Module
Page: 3
1. PRODUCT DESCRIPTION
1.1 GENERAL
The Model 5100-28-IT Infrared (“IR”) Combustible Gas Monitor is a
member of the Information Technology “IT” family of gas sensor
transmitter modules. IT modules offer a broad array of features,
including:
Integral Alphanumeric display
SIL-2 Certified
FM Approved for performance and hazardous locations
Optional Integral alarm relays (3)
4-20 mA output
Modbus® RTU interface
SMC Sentry interface
Optional HART Interface
316 Stainless steel enclosure option
Remote Sensor option
% LEL or % Volume operation
Low maintenance and operation costs
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. Options which can be re-configured by the installer or field technician are fully described in
this manual.
1.3 THEORY OF OPERATION
Infrared (IR) gas sensors operate on the principle of absorption of IR light. As air containing an IR absorbing
gas passes between an IR source and IR detector, the amount of light detected is attenuated. The attenuation
of IR light is then compared to a calibrated standard to determine the concentration of gas in the air sample.
1.4 MODES OF OPERATION
1.4.1 SENTRY INTERFACE
IT gas sensor modules can be installed on Sierra Monitor Sentry Model 5000 controllers Ver. 6.XX MFD
after 9/1/95. Infrared 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 Module Address Switch accessible from the cover plate as illustrated in Figure 4-
1. Figure 4-5 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
5.3) should be set to “Sentry”, allowing the Sentry controller to manage alarm relay action rather than the
5100-28-IT Gas Sensor Module.
® Registered trademark of Schneider Electric
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