Vaisala HMP7 - Table 44 HMP9 Inputs and Outputs; Table 45 HMP9 Output Parameters; Table 46 HMP9 Compliance

Property Description/Value
IP rating of probe body IP65: Dust-tight. Protected from water jets from
any direction.
1) Consult Vaisala if other chemicals are present. Consider safety regulations with flammable
gases.
Table 44 HMP9 inputs and outputs
Property Description/Value
Operating voltage 15 … 30 V DC
Current consumption 5 mA typical, 400 mA max.
Digital output RS-485, non-isolated
Default serial settings 19200 bps N 8 2
Protocol Modbus RTU
Table 45 HMP9 output parameters
Output parameter name and unit
Absolute humidity (g/m
3
)
Relative humidity (%RH)
Absolute humidity at NTP (g/m
3
)
Relative humidity (dew/frost) (%RH)
Dew point temperature (°C) Temperature (°C)
Dew/frost point temperature (°C) Water concentration (ppm
v
)
Dew/frost point temperature at 1 atm (°C) Water concentration (wet basis) (vol‑%)
Dew point temperature at 1 atm (°C) Water mass fraction (ppm
w
)
Dew point temperature dierence (°C) Water vapor pressure (hPa)
Enthalpy (kJ/kg) Water vapor saturation pressure (hPa)
Mixing ratio (g/kg) Wet-bulb temperature (°C)
Table 46 HMP9 compliance
Property Value/Description
EU directives EMC Directive (2014/30/EU)
RoHS Directive (2011/65/EU)
EMC compatibility EN 61326‑1, industrial environment
Compliance marks CE, China RoHS, RCM, WEEE
Chapter 9 – Technical data
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