Humidity and Temperature Probe for Demanding Environments and Metreology applications


The Vaisala HUMICAP® Humidity and Temperature Probe HMP155 provides reliable humidity and temperature measurement. It is designed especially for demanding outdoor applications.

Long-term Stability

The HMP155 has the proven VaisalaHUMICAP®180R sensor that has excellent stability and withstands well harsh environments.
The probe structure is solid and the sensor is protected by default with a sintered teflon filter, which gives maximum protection against liquid water, dust, and dirt.

Warmed Probe and High Humidity Environment
Measuring humidity reliably is challenging in environments where humidity is near saturation.
Measurements may be corrupted by fog, mist, rain, and heavy dew.
A wet probe may not give an accurate measurement in the ambient air.
This is an environment to which Vaisala has designed a patented, warmed probe for reliable measuring.
As the sensor head is warmed continuously, the humidity level inside it stays below the ambient level.
Thus, it also reduces the risk of condensation forming on the probe.

Fast Measurements
With its fast response time, the additional temperature probe for the HMP155 is ideal for measurement in environments with changing temperatures.
The new membrane filter speeds up the RH measurement.

Long Lifetime
Protecting the sensor from scattered and direct solar radiation, and precipitation will increase its lifetime.
Thus, Vaisala recommends installing the HMP155 in one of the following radiation shields: DTR503, DTR13, or a Stevenson screen.
For the additional temperature probe, an installation kit is available to be used with DTR502 radiation shield.


  • Vaisala HUMICAP®180R sensor - superior long-term stability
  • Optional warmed humidity probe and chemical purge
  • Plug-and-play
  • USB connection for service use
  • Fits with DTR13 and DTR503 radiation shields and also for a Stevenson screen
  • Weather-proof housing IP66
  • Optional, fast temperature probe
  • Different output possibilities: voltage, RS-485, resistive Pt100
  • Applications: meteorology, aviation and road weather, instrumentation

Application of HMP155


Types Of Humidity Products - Fixed Installations

  • HMT330

  • HMT360

  • HMD60/70

  • HMP155

  • HMT310

  • HMDW80

  • HMT120/130

  • HMW90

  • HMDW110

  • HMS110

  • HMS80