Vaisala HUMICAP® Humidity and Temperature Probe HMP155

Product Description

  • Vaisala HUMICAP®180R sensor – superior long-term stability
  • Optional warmed humidity probe and chemical purge
  • USB-connection cable for service use
  • Fits in DTR13 and DTR502/503 radiation shields and also in the 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

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. Easy Maintenance The probe can be calibrated using a pc with a USB cable, with the push buttons, or with the MI70 indicator.