Combustible Gas, Toxic Gas, Oxygen Deficiency Transmitters and Alarms 
Sierra Monitor fixed gas detectors, gas monitors, flame detectors and hazardous gas detection systems are used in industrial facilities worldwide.
The Gas Detectors range from basic gas monitors with alarms to complete plant-wide intelligent hazardous gas detection systems utilizing digital 2-way communications between the sensors and the controller and the controller to the plant DCS.
The Sentry IT Smart Gas Detectors provide multiple avenues of interface to plant-wed industrial controls. Sentry Plant-wide Gas Detection System: comprehensive, top-of-the-line plant-wide hazardous gas detection system Smart Gas Detectors (IT Series): 
- smart gas sensor modules incorporating 4-20 mA
- Sentry and Modbus output
- digital display
- relays
- extensive diagnostics
- proven reliability and flexibility
4-20 mA Analog Gas Sensors: detectors for combustible gas, toxic gas and oxygen deficiency with 4-20 mA output of gas concentration
2-Wire Gas Sensors: the latest in loop-powered gas detection loaded with features not normally found in these easily to install sensor modules
Gas Monitors: basic go/no-go gas alarms and monitors
Flame Detectors: Industrial flame detectors utilizing multi-spectrum design
Open Path Gas Detection: real-time monitoring of gaseous emissions over large areas for both combustible and toxic gases
In-Stream Analyzer: Hydrogen Sulfide in Methane gas stream analyzer Custom Systems: systems designed for a variety of industrial, commercial and military applications
