Vaisala PTU300 Guida Utente Pagina 208

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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)
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