1. Home
  2. Products
  3. Instruments, sensors and other measurement devices
  4. Intrinsically Safe Humidity and Temperature Transmitter Series HMT370EX

Intrinsically Safe Humidity and Temperature Transmitter Series HMT370EX

For use up to zone 0 and 20

Please note that the HMT370EX has been released with IECEx, ATEX, FM, NEPSI, KC, and MET certificates for intrinsically safe compliance, but CSA approval is still pending.

The intrinsically safe HMT370EX is the ideal solution for use in hazardous areas up to zone 0 and 20. In addition to measuring relative humidity and temperature, the transmitter outputs also other humidity parameters: dew point temperature, wet-bulb temperature, absolute humidity, mixing ratio, water concentration, water mass fraction, water vapor pressure, and enthalpy. Special models for moisture in oil and jet fuel measurements are available.

Contact us
Datasheet
Order Form

Typical applications

Typical applications include fuel storage tanks, manufacturing of chemicals, pharmaceuticals and food, paint booths, and any other industry or process where intrinsically safe humidity or moisture in oil measurement is required. View the current certificates for the HMT370EX:

Replaces the HMT360 transmitter series

This next-generation HMT370EX transmitter replaces the long-running HMT360 transmitter series.

The HMT370EX offers several probe options for different applications:

  • HMP371 - for wall mounting
  • HMP373 - for confined spaces
  • HMP374 - for pressurized spaces
  • HMP375 - for high temperature
  • HMP377 - for high humidity
  • HMP378 - for pressurized pipelines

Models for measuring moisture in oil and jet fuel:

  • HMP378F - for moisture in oil
  • HMP378H - for JET A-1 fuel

The HMT370EX uses the superior Vaisala HUMICAP technology. 

Features

  • Intrinsically safe (Exi)
  • Interchangeable probes
  • Detachable probe module
  • Graphical LCD display and non-display model
  • Vaisala HUMICAP® sensor
  • Compatible with Vaisala Insight PC software
  • Traceable calibration (certificate included)

Key benefits

Intrinsically safe

The entire HMT370EX transmitter can be installed directly in explosive areas. It can withstand continuous exposure to potentially explosive environments that contain flammable liquids, gases or dust. Operation in any of these environments requires no additional protective enclosures.

Detachable probes

Probes can be easily replaced and removed for calibration outside the hazardous area without removing the entire transmitter. Attaching new probes involves minimal reconfiguration, as up-to-date settings can be restored from the transmitter.

Easy to configure

Output configuration and measurement calibration and adjustment can be carried out directly on the optional local display interface. Alternatively, you can connect the transmitter to Vaisala Insight PC software and configure both the transmitter and the probe together or separately.

Product documentation

Datasheets User guides More in Docs.vaisala.com

More downloads

Product Resources

Blog

Safely monitor hazardous and explosive environments with the Vaisala HMT370EX

For decades those operating in hazardous environments have trusted the Vaisala HMT360 to measure humidity and temperature safely and reliably, even in zone 0 areas. Now the intrinsically safe Vaisala HMT370EX can provide the same safe and reliable measurement data, with several key new benefits. 

 Learn more

Release

Vaisala launches the next-generation humidity and temperature transmitter series HMT370EX for hazardous environments

The new Vaisala HUMICAP© Intrinsically Safe HMT370EX Humidity and Temperature Transmitter Series builds on over 20 years of experience with the trusted Vaisala HMT360 series with an even more robust and easy-to-use design.

 Learn more

Expert article

Q&A about intrinsically safe measurement devices

In this Q&A blog we take a look at what we mean when we talk about intrinsically safe devices, where they can be installed, and what other safety precautions need to be considered when using them.

 Learn more