Vaisala AWS330 User Manual
Page 279
Appendix B ______________________________________________________ Calculation Formulas
VAISALA ______________________________________________________________________ 277
P
wi
(t) is calculated with the formula:
01
.
0
)
log(
6
5
4
3
2
1
0
exp
)
(
4
3
2
⋅
⋅
+
⋅
+
⋅
+
+
⋅
+
+
=
t
a
t
a
t
a
t
a
t
a
a
t
a
t
P
wi
where
a0 =
-5674.5359
a1 =
6.3925247
a2
= -9.677843E - 03
a3 =
0.00000062215701
a4
= 2.0747825E - 09
a5
= -9.484024E - 13
a6 =
4.1635019
t =
Temperature
[K]
Table 115
Inputs for Wet Bulb Temperature Calculation
Input Variable
Air temperature (T
A
Dewpoint temperature (T
d
) DPAVG1M,
Atmospheric pressure (P
A
) QFEAVG1M,
see