Vaisala PTU300 Uživatelská příručka stáhnout pdf (Strana 183)

APPENDIX B_______________________________________________ CALCULATION FORMULAS

VAISALA ______________________________________________________________________ 181

where:

= -0.14452093 * 10

-7

= 6.5459673

The water vapor pressure is calculated using:

100

RHP 

(7)

Parts per million by volume is calculated using:



ppm





(8)

Symbols:

= dewpoint temperature (°C)

= water vapor pressure (hPa)

= water vapor saturation pressure (Pa)

= relative humidity (%)

= mixing ratio (g/kg)

= atmospheric pressure (hPa)

= absolute humidity (g/m3)

= temperature (K)

= enthalpy (kJ/kg)

Height compensated pressure values (QFE, QNH, and HCP) are

calculated using the following equations:

(9)

where:

= measured air pressure

QFE

= height difference between the barometer and the reference

level (m)

= 9.81 (m/s

)

= 287 (J/kg/K)

= temperature (K)

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Vaisala PTU300 Uživatelská příručka Strana 183