Kipp&Zonen COMBILOG Data Logger - Manual (Page 168)

G. Algorithms for special meteorological Parameters
Index of constants
SVP = Saturation vapor pressure in hPa
VP = Actual vapor pressure in hPa with air temperature TT
TT = Dry bulb temperature in °C
HT = Wet bulb temperature in °C
SP = Air pressure, reduced to average gravity and 0 °C,
at station altitude; normally 1013.246 hPa is calculated
RF = Rel. humidity in %
DT = Dew point temperature in °C
( )
C HT = + 0 00066 1 0 00115 . * . *
C
1
= 6.1078
C
2
= 17.84362 (at TT < 0 °C)
C
2
= 17.08085 (at TT > 0 °C)
C
3
= 245.425 (at TT < 0 °C)
C
3
= 234.175 (at TT > 0 °C)
Hardware Manual COMBILOG 1022 168