User's Guide ______________________________________________________________________
144 _________________________________________________________________ M210796EN-A
Calculated Variables
Table 21 Calculated Variables (Typical Ranges)
Variable PTU 301 PTU303 PTU 307
Dewpoint temperature -20...+60 ºC -20...+80 ºC -20...+100 ºC
Mixing ratio 0...160 g/kg dry air 0...500 g/kg dry air 0...500 g/kg dry air
Absolute humidity 0...160 g/m
3
0...500 g/m
3
0...500 g/m
3
Wet bulb temperature 0...60 ºC 0...+100 ºC 0...+100 ºC
Enthalpy -40...+1500 kJ/kg -40...+1500 kJ/kg -40...+1500 kJ/kg
Water vapor pressure 0... 1000 hPa 0... 1000 hPa 0... 1000 hPa
Accuracies Of Calculated Variables
Accuracies of the calculated variables depend on the calibration
accuracy of the humidity and temperature sensors; here the accuracies
are given for ± 2 %RH and ± 0.2 °C.
Accuracy of Dewpoint Temperature °C
Relative humidity
Temp. 10 20 30 40 50 60 70 80 90 100
-40 1.86 1.03 0.76 0.63 0.55 0.50 0.46 0.43 — —
-20 2.18 1.19 0.88 0.72 0.62 0.56 0.51 0.48 — —
0 2.51 1.37 1.00 0.81 0.70 0.63 0.57 0.53 0.50 0.48
20 2.87 1.56 1.13 0.92 0.79 0.70 0.64 0.59 0.55 0.53
40 3.24 1.76 1.27 1.03 0.88 0.78 0.71 0.65 0.61 0.58
60 3.60 1.96 1.42 1.14 0.97 0.86 0.78 0.72 0.67 0.64
80 4.01 2.18 1.58 1.27 1.08 0.95 0.86 0.79 0.74 0.70
100 4.42 2.41 1.74 1.40 1.19 1.05 0.95 0.87 0.81 0.76
120 4.86 2.66 1.92 1.54 1.31 1.16 1.04 0.96 0.89 0.84
140 5.31 2.91 2.10 1.69 1.44 1.26 1.14 1.05 0.97 0.91
160 5.80 3.18 2.30 1.85 1.57 1.38 1.24 1.14 1.06 0.99
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