Vaisala PTU300 Guida Utente Pagina 102

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USER'S GUIDE____________________________________________________________________
100 _________________________________________________________________ M210796EN-E
Using Serial Line
PRES and XPRES
Command XPRES should be used if the value is changed frequently. Its
value is not retained at reset, and when set to 0, last value set with PRES
is used instead. Use the serial line and do the following:
PRES [aaaa.a]
XPRES [aaaa.a]
where
aaaa.a = Absolute process pressure (hPa)
Example:
>pres
Pressure : 1013.00 hPa ?
>pres 1010
Pressure : 1010.00 hPa
>
Table 30 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
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