Vaisala PTU300 Guide de l'utilisateur Page 83

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Vue de la page 82
Chapter 4 ________________________________________________________________ Operation
VAISALA _______________________________________________________________________ 81
XPRES [aaaa.a]
where
aaaa.a = Absolute process pressure (hPa)
Example:
>pres
Pressure : 1013.00 hPa ?
>pres 1010
Pressure : 1010.00 hPa
>
Table 15 Multiplication Factors
From To: hPa
mbar 1
Pa N/m2 0.01
mmHg torr 1.333224
inHg 33.86388
mmH
2
O 0.09806650
inH
2
O 2.490889
atm 1013.25
at 980.665
bar 1000
psia
1)
68.94757
1) psia = psi absolute.
Example:
29.9213 inHg = 29.9213 x 33.86388 = 1013.25 hPa
PFIX
Use the PFIX command to select either P inputted or P measured.
- When PFIX is On, fixed PRES value is used
- When PFIX is Off, measured PRES value is used
PSTAB
Use the PSTAB command to define the pressure stability indicator
reflecting maximum allowed pressure difference between two
successive averaged measurements. The user also has to define the
FORM command to include the "OK" stability indicator field. The
factory setting for the stability indicator level is 0.5 hPa.
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