Kipp&Zonen COMBILOG Data Logger - Manual (Page 169)

Saturation vapor pressure
( )
SVP TT C e
C TT
C TT
= +
1
2
3 *
*
by MAGNUS (1)
Actual Vapor Pressure VP
( ) ( )
VP SVP HT C SP TT HT = − − * * by SPRUNG (2)
Rel. humidity RF from dry- and wet bulb t-.emperature
( )
RF
VP
SVP TT
= *100% (3)
Dew point temperature DT
a) Dew point from psychrometric measurement (dry- and wet
bulb temperature)
DT
C
VP
C
C
VP
C
=
−
3
1
2
1
* ln
ln
(4)
b) Dew point from rel. humidity and air temperature
DT C
RF
SVP
C
C RF
SVP
C
=






−






3
1
2
1
0 01
0 01
ln . * *
ln . * *
(5)
Hardware Manual COMBILOG 1022
169