Vaisala PTU300 Guia do Utilizador descarregar pdf (Página 146)

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

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 ... 141 142 143 144 145 146 147 148 149 150 151 ... 172 173

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Vaisala PTU300 Guia do Utilizador Página 146