Vaisala HMP243 Betriebsanweisung PDF herunterladen (Seite 119)

HMP240

M210300en Appendix 5: Calculation formulas

117

∑

−=

Θ+Θ=

lnln

iws

bbP

where: b

= coefficients

-1

= -0.58002206 * 10

= 0.13914993 * 10

= -0.48640239 * 10

-1

= 0.41764768 * 10

-4

= -0.14452093 * 10

-7

= 6.5459673

The parameters A, m, and T

depend on temperature according to the follow-

ing table:

t A m T

0 ... 50 °C 6.1078 7.5000 237.3

50 ... 100 °C 5.9987 7.3313 229.1

100 ... 150 °C 5.8493 7.2756 225.0

150 ... 180 °C 6.2301 7.3033 230.0

When T

< 0 and the transmitter is set to dewpoint calculation mode (FROST

OFF), the parameters are as follows:

A = 6.119866 m = 7.926104 T

= 250.4138

When T

< 0 and the transmitter is set to frostpoint calculation mode (FROST

ON), the parameters are as follows:

A = 6.1134 m = 9.7911 T

= 273.47

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Vaisala HMP243 Betriebsanweisung Seite 119