Vaisala PTU300 - Using Serial Line; PRES and XPRES; Table 30 Conversion Factors for Pressure Units

USER'S GUIDE____________________________________________________________________
108 _________________________________________________________________ M210796EN-F
Using Serial Line
PRES and XPRES
Command XPRES must be used if the value is changed frequently (for
example, by an automatic system that updates the value). 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]<cr>
XPRES [aaaa.a]<cr>
where
aaaa.a = Absolute process pressure (hPa)
Example:
>pres
Pressure : 1013.00 hPa ?
>pres 1010
Pressure : 1010.00 hPa
>
Table 30 Conversion Factors for Pressure Units
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