Smart Humidity and Temperature Probe for high pressure HMP4

Humidity and Temperature Probe HMP4
for high pressure humidity and temperature applications with exchangeable sensor

Vaisala HUMICAP® Humidity and Temperature Probe HMP4 is designed for high-pressure applications such as compressed air systems in maritime, breathing air, and industrial applications, where measurement performance and chemical tolerance are essential. 

HMP4 is part of the Indigo family and is compatible with Indigo500 and Indigo200 series transmitters. It can be used with Vaisala Insight PC software for data visualization, easy probe configuration, and field calibration.

Vaisala Official Distributor in Humidity, Dewpoint, Continuous Monitoring System (CMS) viewLinc (2015),
Temperature, CO2, Barometric Pressure, Moisture in Oil, Wind etc in Malaysia since 1990s


  • RH accuracy up to 0.8 %RH and temperature accuracy up to 0.1 °C (0.18 °F)
  • Temperature measurement range -70 ... +180 °C (-94 ... +356 °F)
  • Operating Pressure 0 ... 10 MPa (0 ... 100 bar)
  • Compatible with Indigo series transmitters
  • PPS plastic grid filter with stainless steel mesh delivered as standard
  • Modbus RTU over RS-485 for flexible connectivity​
  • Includes traceable calibration certificate

Key Benefits

For high pressure humidity and temperature processes

HMP4 is a suitable for various industrial applications with moderate humidity and temperature levels with high pressure (Up to 100 bar) environment.

It uses Vaisala’s thin-film capacitive humidity measurement technology, which is now the industry standard in humidity measurement. Vaisala’s HUMICAP® technology provides the best stability, a fast response time, and low hysteresis in a wide range of applications.

Exchangeable sensor with several filter options

The design is ideal for a range of operating environments and allows for flexible field maintenance. The filter and sensor element are field-exchangeable for applications which require frequent replacements. Filters suitable for the HMP4 include stainless-steel 12 µ mesh filters (for applications such as air control units), sintered stainless-steel filters (for applications where maximum protection against dust ingress is essential), and PPS plastic grid filters for improved humidity response time.

Use standalone or with an Indigo Transmitter

Its measurement intelligence and digital Modbus RTU over RS-485 connection within the probe mean that HMP3 can be used as a standalone device. It can also be easily integrated into other systems.

HMP4 is part of the Vaisala Indigo family, so it can be used with Vaisala Indigo series transmitters. The transmitters offer various additional benefits such as a display for data visualization, easy access to probe configuration, and more extensive options for connectivity, supply voltage, and wiring.

Whether using the HMP4 on its own or with an Indigo transmitter, it can be connected to the free Vaisala Insight software for easy field calibration, probe configuration, and device analytics.

Whether using HMP4 standalone or with an Indigo transmitter, it can be connected to the free Vaisala Insight software for easy field calibration, probe configuration and device analytics.​


Specific References

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