TQ122 - 3 Wire - LEL Hydrogen Detector

0-100% LEL Hydrogen ATEX approved, 3-wire Catalytic “Pellistor” sensor


Robust stainless steel housing designed for hostile environments such as offshore and petrochemical works features high thermal mass, providing exceptional zero stability.

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The TQ122-210 series is a range of flameproof (Exdb) flammable gas sensors, for use in zones 1 and 2 hazardous areas. Utilising proven electocatlytic Pellistor technology, it comprises of a detector and compensator elements in a Wheatstone bridge circuit. The senors are industry standard 3-wire devices.



  • Weight: 580g
  • Height: 50mm
  • Length: 50mm

Power Requirements

  • Input Voltage: 24V DC
  • Power Consumption: 250mA
  • Max Switching Current: 2A
  • Power Input: 4-20mA

Time Info

  • Life Expectancy: 2-3 years
  • Warranty: 12 Months
  • Rating: IP55
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