Vaisala PTU300 Guide de l'utilisateur télécharger pdf (Page 160)

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Calculated Variables

Table 36 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

0...500 g/m

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

1 2 ... 155 156 157 158 159 160 161 162 163 164 165 ... 185 186

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