Vaisala HMP4 Relative Humidity & Temperature Probe
Designed for vacuum & high pressure applications up to 100 bar, compatible with Indigo 200 Series host devices
Mo-Th 8am to 5:30pm. Fr 8am to 5pm ET
- HUMICAP R2 composite RH sensor
- 0 to 100% RH range
- Up to 0.8% RH accuracy
- Pt100 RTD Class F0.1 IEC 60751 temperature sensor
- -94 to +356°F (-70 to +180°C) range
- Up to 0.18°F (0.1°C) accuracy
- 15 to 30 VDC operating voltage
- RS-485, non-isolated digital output
- Modbus RTU protocol
- M12/5 connector
- IP66 rating
- Connection cable required & sold separately
What's in the Box
- M22x1.5 & NPT1/2 in fittings
- Traceable calibration certificate
The Vaisala HMP4 relative humidity and temperature probe is designed for high-pressure applications, up to 100 bar, such as compressed air systems in maritime, breathing air, and industrial applications, where measurement performance and chemical tolerance are essential. The HMP4's IP66-rated housing makes it suitable for indoor or outdoor use.
With a HUMICAP R2 composite sensor, the HMP4 offers measurement ranges of 0 to 100% relative humidity and temperature from -94 to +356°F (-70 to 180°C). Vaisala's thin-film capacitive technology allows for RH accuracy up to 0.8% and the Pt100 RTD Class F0.1 IEC 60751 temperature sensor provides accuracy up to 0.18°F (0.1°C).
The Vaisala HMP4 is also part of the Indigo product family and compatible with Indigo 201 and 202 transmitters. The HMP4 is plug and play compatible with Vaisala's Indigo series of transmitters, or it can be used as a standalone digital Modbus RTU transmitter over RS-485 serial bus. If analog output is required the probe must be paired with an Indigo 201 transmitter.
These additional components are required for the operation of your product. We strongly advise you to purchase these components unless you already own them or own a suitable alternative.
Please consider these optional accessories.