Calculation formulas, Formulas used by the product, Appendix a – Vaisala PTB330 User Manual
Page 135
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Appendix A ______________________________________________________ Calculation Formulas
VAISALA ______________________________________________________________________ 133
APPENDIX A
CALCULATION FORMULAS
This appendix contains the calculation formulas used by the product.
Height compensated pressure values (QFE, QNH, and HCP) are
calculated using the following equations:
where:
p
=
measured air pressure [hPa]
h
QFE
=
height difference between the barometer and reference
level [m]
g =
9.81
[m/s2]
R =
287
[J/kg/K]
T =
temperature
[K]
where:
H
QNH
=
station elevation [m]
g =
9.81
[m/s
2
]
R =
287
[J/kg/K]
T =
288.15
[K]
= -0.0065
[K/m]
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