Vaisala DMT346 - Manual (Page 102)

User's Guide _______________________________________________________________________
102 __________________________________________________________________ M210762EN-G
Press the set button (P
set
) to set the pressure value. The number of presses
equals the number of bar
a
to be set (for example,
three presses = three bar
a
). After a few seconds, the red LED will confirm
the setting by flashing the new pressure value.
Using Serial Line
XPRES and PRES
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]
XPRES [aaaa.a]
where
aaaa.a = Absolute process pressure (hPa)
Examples:
>pres
Pressure : 1013.00 hPa ?
>pres 1010
Pressure : 1010.00 hPa
>
Table 28 Conversion Factors for Pressure Units
From To: hPa
mbar 1
PaN/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
psi
a
1) 68.94757
1) psi
a
= psi absolute
Example:
29.9213 inHg = 29.9213 × 33.86388 hPa = 1013.25 hPa