Vaisala PTU300 - Manual (Page 208)

User's Guide _______________________________________________________________________
206 __________________________________________________________________ M210796EN-G
Height compensated pressure values (QFE, QNH, and HCP) are
calculated using the following equations:
(9)
where:
p = measured air pressure
h
QFE
= height difference between the barometer and the reference
level (m)
g = 9.81 (m/s
2
)
R = 287 (J/kg/K)
T = temperature (K)
(10)
where:
h
QNH
= station elevation (m)
g = 9.81 (m/s
2
)
R = 287 (J/kg/K)
T
0
= 288.15 (K)
α = -0.0065 (K/m)
(11)
where:
p = measured air pressure
H
HCP
= height difference between the barometer and the reference
level (m)