Vaisala HMP4 - Table 14 HMP3 Inputs and Outputs; Table 15 HMP3 Output Parameters; Table 16 HMP3 Compliance; Table 17 HMP3 Mechanical Specifications

Table 14 HMP3 inputs and outputs
Property Description/Value
Operating voltage 15 … 30 V DC
Current consumption 10 mA typical, 500 mA max.
Digital output RS-485, non-isolated
Protocols Modbus RTU
Table 15 HMP3 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 16 HMP3 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
Table 17 HMP3 mechanical specifications
Property Description/Value
Connector M12 5-pin A-coded male
Weight 302 g (10.65 oz)
Materials
Probe AISI 316L
Chapter 9 – Technical data
69