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The Vaisala HMP3 is a general-purpose probe suitable for various industrial applications with moderate humidity and temperature levels.
It incorporates Vaisala’s thin-film capacitive humidity measurement technology, which is now the industry standard in humidity measurement. Vaisala’s HUMICAP® technology provides superior stability, a quick response time, and low hysteresis in a vast range of applications.
The HMP3 is part of the Vaisala Indigo family and is compatible with Indigo 200 transmitters. It can be used with Vaisala Insight PC software for data visualization, easy probe configuration, and field calibration.
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® R2C 3) HUMICAP® 180VC 3) 4) |
| Temperature | |
| Sensor | Pt100 RTD Class F0.1 IEC 60751 |
| Measurement range | −40 … +120 °C (−40 … +248 °F) |
| Accuracy 1) | ±0.1 °C (±0.18 °F) |
| Factory calibration uncertainty 2) | ±0.1 °C (±0.18 °F) at +23 °C (+73.4 °F) |
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 range for probe head | −40 … +120 °C (−40 … +248 °F) |
| Operating temperature range for probe body | −40 … +80 °C (−40 … +176 °F) |
| Storage temperature range | −40 … +80 °C (−40 … +176 °F) |
| Operating environment | Suitable for outdoor use |
| Measurement environment | For air, nitrogen, hydrogen, argon, helium, and oxygen |
| IP rating of probe body | IP66 |
| EMC compatibility | EN61326-1, Industrial environment |
Mechanical Specifications
| Connector | M12 5-pin A-coded male |
| Weight | 302 g (10.65 oz) |
| Materials | |
| Probe | AISI316L |
| Probe body | AISI316L |
| Cable jacket | FEP |
Inputs and Outputs
| Operating voltage | 15 … 30 VDC |
| Current consumption | 10 mA typical, 500 mA max. |
| Digital output | RS-485, non-isolated |
| Protocols | Modbus RTU |
| Output Parameters | |
| Relative humidity, temperature, dew point temperature, dew point temperature difference (T−Td/f), wet-bulb temperature, absolute humidity, mixing ratio, water concentration, water vapor pressure, enthalpy | |
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