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Infrared Combustible Gas Detector – IR400

Infared Combustible Gas Detector
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Infrared Combustible Gas Detector – IR400

Infrared Combustible Gas Detector – General Monitors IR400 Sensor

The Model IR400 Infrared Combustible Gas Detector is a microprocessor-based hydrocarbon gas detector that continuously monitors combustible gases and vapors within the lower explosive limit (LEL) and provides alarm indication.

All electronics are contained within an explosion-proof housing so that the IR400’s detector information can be processed locally. The IR400 operates with a 4-20mA signal, which is proportional to 0 to 100% LEL gas concentration at the detector. Configurations with analog output, Modbus and HART are also available.


  • Industry-leading speed & response: T90 ≤ 3 seconds even with splash guard installed
  • No routine calibration required reducing maintenance costs
  • Industry standard 4-20 mA output provides remote alarm and fault indication
  • Multiple communication outputs provide complete status and control capability in the control room
  • Heated optics eliminate condensation
  • Dirty optics indication discriminates between true fault and cleaning requirements
  • Fast calibration times reduce amount of cal gas required which lowers maintenance time and costs


  • Refineries
  • Drilling rigs and platforms
  • Fuel loading facilities
  • Compressor stations
  • Oil well logging
  • LNG / LPG processing and storage facilities
  • Wastewater treatment facilities
  • Gas turbines
  • Solvent vapors
  • Chemical plants