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Vaisala HMP1 RH&T Probe

Vaisala HMP1 is designed for measuring ambient measurement in indoor spaces. Vaisala HMP1 can be directly connected to Indigo200 series transmitters for general laboratory type applications and Vaisala Indigo 500 Series Transmitter for more industrial, demanding installations.  Electronics and calibration is contained within the probe head.  The integrated probe is a small 5 mm diameter designed for quick response.  The sensor itself is the established HUMICAP® which offers reliability and long term stability.

Along with indigo interaction, Vaisala HMP1 can also be used as a stand alone digital Modbus RTU transmitter over RS-485 serial bus. It can be configured with Vaisala Insight PC Software, which also allows data visualization and calibration.  Vaisala HMP1 probes come with a factory calibration certificate as standard.  Fluidic have an RH&T calibration lab and can offer ongoing calibration (or EN 17025 accredited calibration via our partnership with Vaisala directly).


Vaisala HMP1 RH&T Probe Specifications

  • Ideally used with Indigo 500 or Indigo 200 Transmitters
  • Can act as a stand alone instrument with Modbus output
  • Wall mount design with no cable between head and sensor probe
  • RH uncertainty within ±1%RH (at 50%RH, 23°C)
  • Temp uncertainty within ±0.2°C (at 50%RH, 23°C)
  • RH measurement range 0…100%RH
  • Temperature measurement range -40…+60°C
  • Vaisala HUMICAP® Sensor Technology
  • 316SS probe with PBT plastic head, IP50
  • Factory calibration certificate included as standard 6 point RH, 1 point temperature)
    • Fluidic offer ongoing calibration (please contact either office for details)
  • Various calculated output options (absolute humidity, dew point, enthalpy etc, see datasheet)
  • Configurable with Vaisala Insight software and Vaisala USB2 cable


Vaisala HMP1 is part of a series of HMP probes for use with the Indigo transmitter family.  Please contact Fluidic for help with product selection.


​Fluidic are a recognised partner of Vaisala CEN (Industrial division) for Scotland and the North of England.  Our instrumentation engineers are product trained and able to help with instrument selection within the full range of Vaisala Carbon Dioxide, CO2 instrumentation.  Please call either office for more information (Glasgow 0141 641 5920,  Warrington 01925 572401).


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