Intrinsically safe Humidity and Temperature Transmitter HMT368

The HMT368 has been discontinued, the product data is for reference purposes. View the new HMT370EX, also designed for use in hazardous and explosive areas. The HMT370EX replaces the HMT368. 

Humidity and Temperature Transmitter HMT368  is suitable for measuring moisture in oil in e.g. central lubrication systems, hydraulic systems and power transformers, and it is designed specifically for hazardous and explosive environments. The entire transmitter can be placed into zone 0. The HMT368 probe enables flexible installation in pressurized pipelines.  In addition, there is another version for measuring JET A-1 fuel moisture. The HMT368 is part of the HMT360 series.

  • HMT368F for moisture in oil
  • HMT368H for JET A-1 fuel

Click here to download bid specs for USA.


  • Complies with classifications from FM (USA), CSA (Canada), TIIS (Japan), PCEC (China), and VTT (IECEx)​
  • Interchangeable probe allows for easy maintenance & calibration
  • Measures humidity and temperature, outputs also dew point, mixing ratio, absolute humidity and wet bulb temperature
  • Safe operation with the entire transmitter in hazardous areas: Division 1 and 2, Categories 1G / Zone 0
  • Vaisala HUMICAP® Sensor features high accuracy, excellent long-term stability, and negligible hysteresis
  • NIST traceable (certificate included)
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Key Benefits

Intrinsically safe
The whole transmitter can be installed into the explosive area up to zone 0.
The interchangeable probe module enables a simple switch of a calibrated probe in the field.
The rugged design and trouble-free operation ensure a long product life-time.