Vaisala HMP7 Relative Humidity & Temperature Probe



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  • Vapor & pressure proof construction
  • Probe & sensor warming functions
  • 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

  • Traceable calibration certificate

The Vaisala HMP7 relative humidity and temperature probe features probe and sensor warming functions to minimize condensation in applications with constant high humidity or rapid changes in humidity. Common applications include drying and test chambers, combustion air and other humidifiers and meteorological measurements. The HMP7's IP66-rated housing makes it suitable for indoor or outdoor use.

With a HUMICAP R2 composite sensor, the HMP7 offers measurement ranges of 0 to 100% relative humidity and temperature from -94 to +356°F (-70 to 180°C). Its warming functions, combined with vapor and pressure proof construction, allow the HMP7 to be utilized in high humidity applications for extended periods of time. 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 HMP7 is also part of the Indigo product family and compatible with Indigo 201 and 202 transmitters. The HMP7 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 210697 Duct Installation Kit
0 to 10in (0 to 25cm) adjustable depth, includes flange, supporting bar, plastic sealing ring, screws, and washers
Vaisala DTR502B Radiation Shield
9-plate shield to protect humidity and temperature sensors from solar radiation and precipitation
Vaisala HMP247CG AGRO Cable Gland
M20 x 1.5 with split seal
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
Vaisala SWG12NPT12 Swagelok
Fitting for 12mm diameter probe with 1/2in NPT male thread, rated for up to 145 psi (10 bar)