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1. PRODUCT DESCRIPTION
1.1 GENERAL
The Model 5100-XX-IT Toxics Gas Sensor Module is a member of the Information Technology ”IT” family of
gas sensor transmitter modules. Members of the IT Toxics family include:
• 5100-03-IT Oxygen Deficiency 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
IT modules offer a broad array of features, including:
• Integral alphanumeric LED display
• 180 day calibration frequency
• 4-20 mA output
• Modbus
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RTU interface
• SMC Sentry interface
• 316 Stainless steel enclosure option
• Auxiliary integral relay option
• Remote display option
• 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
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.
1.4 MODES OF OPERATION
1.4.1 SENTRY INTERFACE
IT gas sensor modules can be installed on Sierra Monitor Sentry Model 5000 controllers. The gas sensor
module communicates as a toxic gas sensor module (Type 4 – 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
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Registered trademark of Schneider Electric