Vaisala HMDW110 - Manual (Page 9)

Output Parameters Explained
HMDW110 series transmitters offer several output parameters. Relative humidity
(RH) and temperature (T) are the measured parameters, the others are
calculated based on RH and T.
Parameter Symbol Units Description
Temperature T °C
°F Temperature in Celsius or Fahrenheit scale.
Relative
humidity RH % Ratio of the partial pressure of water vapor in the air to
the saturation vapor pressure of air at current
temperature.
Dewpoint Td/f °C
°F Temperature at which the water vapor in the air will
condense into water at the current pressure. When the
dewpoint is below 0 °C, the transmitter outputs frostpoint
(Tf) instead of dewpoint.
Enthalpy h kJ/kg
BTU/lb Sum of the internal energy of a thermodynamic system.
Wet bulb
temperature Tw °C
°F The minimum temperature that can be reached by
evaporative cooling in the current conditions.
Table 3 HMDW110 Series Output Parameters
Check the type label on your transmitter to verify its output
parameters and scaling of the output channels.
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2 Product Overview