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Sierra Monitor utilizes a variety of gas sensor technologies to provide accurate, reliable monitoring of hazardous gas concentration. Each Sentry smart gas sensor module has a unique address that allows signals from multiple modules to be multiplexed for communication with the controller on the same cable. All Sentry sensor modules are designed for hostile or hazardous environments. Key sensor modules are FM approved.

In addition, with the Analog Input Module, other sensors and devices can be interfaced to the Sentry system. The Analog Input Module accepts digital or 4-20 mA input signals and converts the signal to the Sentry digital protocol.

Sentry sensor features:

• Digital signal transmission between the sensor and controller enabling multiplexing sensor modules on a single cable, significantly reducing installation cost.

• One-person, Non-Intrusive Calibration for ease of use. In the calibration mode, sensors continue to monitor for hazardous conditions until calibration gas is applied. All adjustments are made automatically after calibration gas has been removed. Sentry notifies the operator of calibration completion and allows acceptance or rejection of the calibration at the controller keypad.

• RFI and EMI immunity over extended distances.

• There are no manual adjustments required at the sensor module, the controller automatically makes all necessary adjustments after the calibration gas is removed.

• Automatic, post-calibration, low sensitivity check of the sensor for proper output.

• Power up and calibration output delay to avoid erroneous readings during warm-up and after calibration.

• Diagnostic information displayed on controller's alphanumeric display.

• Catalytic bead, infrared and electrochemical sensor technology for proven reliability and high accuracy.

• Full range of sensors for combustible gas, oxygen deficiency and toxic gases.