Vaisala HMP5 Relative Humidity & Temperature Probe



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  • 250mm (9.84 in) probe length
  • 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
  • M12/5 connector
  • IP66 rating

What's in the Box

  • Sintered AISI316L filter
  • Traceable calibration certificate

The Vaisala HMP5 relative humidity and temperature probe is designed for high-temperature applications, up to 356°F (180°C), such as baking ovens, pasta dryers and industrial drying kilns, where measurement performance and chemical tolerance are essential. The HMP5's IP66-rated housing makes it suitable for indoor or outdoor use.

With a HUMICAP R2 composite sensor, the HMP5 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 HMP5 is also part of the Indigo product family and compatible with Indigo 201 and 202 transmitters. The HMP5 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.

Required Components

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.

Vaisala Indigo 200 Series Remote Probe Cable
Replacement shielded M12 male/female connection cable for Indigo 201/202 and compatible probes


Please consider these optional accessories.

Vaisala Indigo 200 Series Transmitter
Plug-and-play connection for compatible CO2, vaporized hydrogen peroxide, humidity & temperature probes
Vaisala HM47280SP Sintered Filter
12mm diameter, female thread, stainless steel with 38µm pore size
Vaisala HM47453SP SS Filter Guard
12mm diameter, female thread, with 3.15mm holes for oil and air/gas measurements in vacuum environments less than 7.25 psi (0.5 bar)
Vaisala DRW010281SP PPS Grid
12mm diameter, female thread, metallized PPS plastic grid with stainless steel mesh with 15µm pore size
Vaisala DRW010276SP Plastic PPS Grid Filter
12mm diameter, female thread, metallized PPS plastic with 6.5mm gaps between grids
Vaisala 210696 Mounting Flange
Duct installation flange designed for 13.5mm diameter probes, includes plastic sealing ring, screws, and washers
Vaisala 242659 Connection Cable
M12/5 N female to USB cable used to connect Indigo probes to a PC for use with Insight software
In Stock
Vaisala Indigo Compatible Probe Cable
Shielded 5-socket M12 female connection to open wire
In Stock
Vaisala Indigo Compatible Right Angle Probe Cable
90° shielded 5-socket M12 female connection to open wire