The Sentry Gas Detection System provides the flexibility and expandability sought by safety and instrumentation engineers worldwide for plant-wide hazardous gas monitoring needs in a broad range of industrial applications. Implementing the concept of Gas Risk Management in a flexible, easy to operate system, Sentry offers the alarm logic, event response and critical data retention to insure that your safety requirements are met and that your due diligence is documented.

The FM Approved 5100-28-IT IR Gas Sensor Module utilizes Non-Dispersive Infrared technology to monitor for combustible gases (Methane and others). Output range is either 0-100% of LEL (default) or percent (%) by volume. This Module requires minimal maintenance with a calibration check once a year. Internal continuous self-diagnostics will automatically indicate any fault or optics problems.

Infrared technology has the benefits of:

Model 5100-02-IT utilizes the proven, reliable, catalytic bead technology to monitor for combustible gases (methane and others). Output range is 0-100% of Lower Explosive Limit (LEL). This detector has minimal maintenance requirements and is Factory Mutual approved for six month calibration intervals. Internal, continuous self-diagnostics automatically detect and alarm any fault problems. The 5100-02-IT can be used as a 4-20 mA component or as a Modbus RTU node. For higher level system capability the module can interface directly to Sierra Monitor’s Sentry Controller enabling system level Modbus serial communications, area and zone alarm management, extensive system diagnostic features, WebServer interface, and multiplexing sensor connections.

The IT Toxic Series Gas Sensor Modules utilize proven electrochemical technology to monitor for toxic gases or oxygen deficiency. IT Modules require minimal maintenance. Continuous self-diagnostics will automatically detect and indicate any fault condition. This gas sensor module interfaces directly with the Sierra Monitor Sentry Controller via the Sentry digital bus or to other devices using RS-485 Modbus RTU communications.

The module also offers a three or four wire 4-20 mA analog output signal. By integration of IT modules into a Sentry system the user gains the capability of system Modbus serial communications, extensive diagnostic features, WebServer interface, multiplexed sensor wiring and field-proven reliability.