Vaisala HMP3 - Output Parameters

• Traceable calibration certificate:
• HMP and MMP models: 6 points for humidity, 1 point for temperature
• TMP1: 2 points for temperature
• Standalone Modbus RTU over RS-485
• Compatible with Indigo series of transmitters
• Can be connected to Vaisala Insight PC software for configuration, calibration,
diagnostics, and temporary online monitoring
2.3 Output parameters
On HMP probe models, the values of all available output parameters are always
locked when chemical purge or extra heat functions are heating the sensor.
Output parameter is available
Output parameter is available but its value is locked during sensor warming or probe
heating (HMP7 only) unless temperature is written to register 0334
hex
from an external
source
Output parameter is not available on this model
Table 3 Availability of output parameters
Output parameter Output unit HMP3, 4, 5,
7, 8, and 9
MMP8 TMP1
Relative humidity %RH
Temperature °C
Dew point temperature °C
Dew/frost point temperature °C
Dew/frost point temperature at 1 atm °C
Dew point temperature at 1 atm °C
Absolute humidity
g/m
3
Mixing ratio g/kg
Wet-bulb temperature °C
Water concentration ppm
v
Water vapor pressure hPa
Water vapor saturation pressure hPa
Enthalpy kJ/kg
Water activity -
HMP3, HMP4, HMP5, HMP7, HMP8, HMP9, MMP8, TMP1 User Guide M212022EN-D
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