Vaisala HMP7 Relative Humidity & Temperature Probe


  • RH accuracy up to 0.8 %RH.
  • Temperature accuracy up to 0.1 °C (0.18 °F).
  • Temperature measurement range -70 … +180 °C (-94 … +356 °F).
  • Vapor and pressure-proof construction.
  • Probe and sensor warming functions minimize condensation on the probe.
  • Sensor purge provides superior chemical resistance.
  • Plug & play compatible with Indigo™ series of transmitters.
  • Modbus RTU over RS-485.
  • Traceable calibration certificate: 6 points for humidity, 1 point for temperature.

Dpstar is a leading supplier of environmental measurement sensors for temperature, relative humidity, pressure, dew point, CO2, and other environmental condition monitoring for industrial process application and research. Since the ’90s, we earned a reputation as a trusted partner to our clients through our commitment and dedication. We are an authorized distributor and supplier of measuring sensors solutions from renowned manufacturers Vaisala. Vaisala is a global leader in environmental and industrial measurement. Building on 80 years of experience, Vaisala provides observations for a better world. Vaisala is a reliable partner for customers around the world, offering a comprehensive range of innovative observation and measurement products and services.

Vaisala HUMICAP Humidity and Temperature Probe HMP7 is designed for applications which involve constant high humidity or rapid changes in humidity such as drying and test chambers, combustion air and other humidifiers, and meteorological measurements where measurement performance and chemical tolerance are essential. The HMP7 is part of the Indigo product family and compatible with Indigo500 and Indigo200 series transmitters and free Insight PC Software.


Key Benefits

Proven Vaisala HUMICAP performance

Vaisala is the original innovator of the thin-film capacitive humidity measurement technology, which has now become the industry standard in humidity measurement.

No condensation at extreme humidity

Probe heating functionality heats up the whole probe head. When probe temperature is heated above dew point temperature, condensation on the probe can be avoided.

Flexible connectivity

The probe is plug and play compatible with Vaisala Indigo series transmitters, can be used as a standalone digital Modbus RTU transmitter, or connected to Vaisala Insight™ PC Software.


Measurement Performance
Relative humidity
Measurement range 0 … 100 %RH
Accuracy at +23 °C (+73.4 °F) 1) ±0.8 %RH (0 … 90 %RH)
Factory calibration uncertainty 2) ±0.5 %RH (0 … 40 %RH)
±0.8 %RH (40 … 95 %RH)
T63 response time 15 s
Sensor options HUMICAP R2
HUMICAP 180VC 3) 4)
Measurement range −70 … +180 °C (−94 … +356 °F)
Accuracy at +23 °C (+73.4 °F) 1) ±0.1 °C (±0.18 °F)
Factory calibration uncertainty 2) ±0.1 °C (±0.18 °F) at +23 °C (+73.4 °F)
Sensor Pt100 RTD Class F0.1 IEC 60751
1) Defined against calibration reference. Including non-linearity, hysteresis, and repeatability.
2) Defined as ±2 standard deviation limits. Small variations possible; see calibration certificate.
3) Chemical purge feature available with this sensor.
4) H2O2 resistant. With HUMICAP 180VC sensor, accuracy is not specified below −20 °C (−4 °F) operating temperature.
Operating Environment
Operating temperature of probe body −40 … +80 °C (−40 … +176 °F)
Operating temperature of probe head −70 … +180 °C (−94 … +356 °F)
Operational pressure < 10 bar
Operating environment Suitable for outdoor use
Measurement environment For air, nitrogen, hydrogen, argon, helium, oxygen, and vacuum 1)
IP rating of probe body IP66
1) Consult Vaisala if other chemicals are present. Consider safety regulations with flammable gases.
Inputs & Outputs
Operating voltage 18 … 30 V DC
Current consumption 10 mA typical, 500 mA max
Digital output RS-485, non-isolated
Protocols Modbus RTU
Output Parameters
Absolute humidity (g/m3) Relative humidity (%RH)
Absolute humidity at NTP (g/m3) Relative humidity (dew/frost) (%RH)
Dew point temperature (°C) Temperature (°C)
Dew/frost point temperature (°C) Water concentration (ppmv)
Dew/frost point temperature at 1 atm (°C) Water concentration (wet basis) (vol %)
Dew point temperature at 1 atm (°C) Water mass fraction (ppmw)
Dew point temperature difference (°C) Water vapor pressure (hPa)
Enthalpy (kJ/kg) Water vapor saturation pressure (hPa)
Mixing ratio (g/kg) Wet-bulb temperature (°C)
EU directives EMC Directive (2014/30/EU)
RoHS Directive (2011/65/EU)
EMC compatibility EN 61326 1, industrial environment
Type approvals DNV GL certificate no. TAA00002YT
Compliance marks CE, China RoHS, RCM, WEEE
Mechanical specifications
Connector M12 5-pin A-coded male
Weight 310 g (10.9 oz)
Probe AISI 316L
Probe body AISI 316L
Cable jacket FEP
Duct installation kit for RH probe 210697
Solar radiation shield DTR502B DTR502B
Cable gland M20×1.5 with split seal HMP247CG
Swagelok for 12 mm probe, 1/2″ ISO thread SWG12ISO12
Swagelok for 12 mm probe, 3/8″ ISO thread SWG12ISO38
Swagelok for 12 mm probe, 1/2″ NPT thread SWG12NPT12
Indigo USB adapter 1) USB2
1) Vaisala Insight software for Windows available at


Vaisala HMP7 Relative Humidity & Temperature Probe_DpstarGroup