T A m Tn
50 ... 100 °C 5.9987 7.3313 229.10
100 ... 150 °C 5.8493 7.2756 225.00
150 ... °C 6.2301 7.3033 230.00
A.3 Dew/frostpoint Temperature Calculation
Dew/frostpoint temperature (T
df
) is calculated with the following formula:
0
=
< 0
=
log
1 °
Pw is the water vapor pressure (see the separate calculation formula for P
w
). The parameters
A, m, and Tn depend on the temperature as shown in Table 48 (page 78).
Table 48 Temperature Dependence for A, m, and Tn
T A m Tn
... 0 °C 6.1134 9.7911 273.47
A.4 Mixing Ratio Calculation
The mixing ratio (x, mass of water vapour/mass of dry gas) is calculated with the following
formula:
= ×
/
where
B
621.9907 g/kg
The value of B depends on the gas. 621.9907 g/kg is valid for air.
HMT120 User Guide M211244EN-C
78
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