Ahlborn ALMEMO 2390-5 Wartungshandbuch PDF herunterladen (Seite 15)

Pressure Modules for Dynamic Pressure

Air velocity for selected dynamic pressures (Prandtl Pitot tube, T = 22 °C)

Dynamic pressure [Pa] Dyn. pressure [mmWS] Air velocity [m/s]

1 0.1 1.29

2 0.2 1,83

3 0.3 2,24

4 0.41 2.59

5 0.51 2.89

10 1.02 4.09

20 2.04 5.78

30 3.06 7.08

40 4.08 8.18

50 5.1 9.14

100 10.2 12.93

Correction factors for consideration of temperature and air pressure:

The true air velocity is depending on the air temperature and the barometric air

pressure. Therefore, the measured value must be corrected according to the

following table to obtain exact measurements of the air velocity.

Air 940 960 980 1000 1020 1040

temperature mbar mbar mbar mbar mbar mbar

- 30 °C 0.942 0.932 0.922 0.913 0.904 0.895

- 20 °C 0.961 0.951 0.941 0.932 0.923 0.914

- 10 °C 0.98 0.97 0.96 0.95 0.941 0.931

0 °C 0.998 0.988 0.978 0.968 0.958 0.949

10 °C 1.016 1.005 0.995 0.985 0.975 0.966

20 °C 1.035 1.024 1.013 1.003 0.993 0.983

30 °C 1.051 1.04 1.029 1.019 1.009 0.999

40 °C 1.069 1.057 1.047 1.036 1.026 1.016

50 °C 1.085 1.074 1.063 1.052 1.042 1.031

60 °C 1.102 1.09 1.079 1.068 1.057 1.047

70 °C 1.118 1.106 1.095 1.084 1.073 1.063

80 °C 1.135 1.123 1.111 1.1 1.089 1.078

90 °C 1.151 1.139 1.127 1.116 1.105 1.094

100 °C 1.167 1.154 1.142 1.131 1.12 1.109

150 °C 1.242 1.229 1.216 1.204 1.192 1.18

200 °C 1.314 1.3 1.287 1.274 1.261 1.249

250 °C 1.381 1.367 1.353 1.339 1.326 1.313

300 °C 1.446 1.431 1.416 1.402 1.388 1.375

400 °C 1.567 1.55 1.534 1.519 1.504 1.489

500 °C 1.68 1.663 1.646 1.629 1.613 1.597

600 °C 1.784 1.766 1.748 1.73 1.713 1.696

700 °C 1.884 1.865 1.846 1.827 1.809 1.791

ALMEMO

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