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Vaisala HUMICAP® Humidity and Temperature Probe HMP155

Temperature and Humidit Meter - Vaisala HUMICAP® Humidity and Temperature Probe HMP155
Vaisala HUMICAP 40 Years!

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      • 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
      Technical Specifications

       Technical Specifications


      Relative humidity measurement


      ​Measurement range ​0 ... 100 % RH

      ​Accuracy (incl. non-linearity, hysteresis and repeatability) at

      ​     +15 … +25 °C

      ​     (+59 … 77 °F)

      ​For other temperatures, please see the the brochure ​±1 % RH (0 ... 90 % RH), ± 1.7 % RH (90 ... 100 % RH)

      ​Recommended humidity sensor ​Vaisala HUMICAP® 180R


      Temperature measurement


      ​Measurement range ​-80 ... +60 °C (-112 ... +140 °F)

      ​Accuracy at +20 °C

      ​     voltage ​±0.17 °C

      ​     RS485 ±0.12 °C

      ​     passive resistive output ​according to IEC751 1/3 Class B

      ​Temperature sensor ​Pt100 RTD

      ​Optional additional T probe

      Other variables
      dewpoint/frost point temperature
      wet bulb temperature, mixing ratio


      Operating environment



      ​   operation ​-80 ... +60 °C (-112 ... +140 °F)

      ​    storage ​-80 ... +60 °C (-112 ... +140 °F)


      Inputs and outputs


      Operating voltage ​7 ... 28 VDC


      ​    voltage output ​0 ... 1V, 0 … 5 V, 0 … 10 V

      ​     resistive Pt100 (4-wire

      ​    RS485



      Connection cables
      Material (housing)
      Housing classification

      3.5, 10, and 30 m


      For complete specifications, please see the brochure or user guide in "Documents".

      Related Services
      • Warranty 
      • All Vaisala products and services are covered by a 12-month warranty as standard, with selected products covered for up to 24 months. During this period you benefit from free repair or replacement of faulty equipment. With Vaisala’s extended warranty, you get free repair or replacement for five years.
      • Repair Services 
      • Vaisala repair services include fault tracing and repair or replacement of failed components, as well as final testing to ensure your equipment is functioning properly. Repairs can be carried out on site or at one of our service centers.
      • Service Center Calibration 
      • Regular calibration ensures that your Vaisala equipment continues to provide accurate, high-quality data. We offer traceable, standards-compliant calibration services for almost all Vaisala products and partner with world-class couriers for rapid, trouble-free return of your equipment.
      • Spare Parts 
      • Get rapid access to the spare parts you need to maximize the uptime of your equipment and ensure reliable and accurate operation. In addition to standard spare part delivery, we also offer an express service where parts are shipped within one business day.