Calculation formulas overview - HMT130

HMT130 User Guide

Document code
M211280EN
Revision
D
Language
English (United States)
Product
HMT130
Document type
User guide

The transmitter receives the relative humidity and temperature values from the HMP110 probe. Based on these temperature and relative humidity values, the transmitter calculates dew point, frost point, absolute humidity, mixing ratio, enthalpy, wet bulb temperature, saturation vapor pressure and vapor pressure in normal pressure.

Symbols:

Td
Dew point temperature (°C)
Pw
Water vapor pressure (hPa)
Pws
Saturation vapor pressure (hPa)
RH
Relative humidity (%)
x
Mixing ratio (g/kg)
p
Atmospheric pressure (hPa)
a
Absolute humidity (g/m3)
T
Temperature (°C)
h
Enthalpy (kJ/kg)
Tw
Wet bulb temperature (°C)
Tdf
Dew/frost point temperature (°C)