Vaisala DMP248 Instrukcja Obsługi Strona 105

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APPENDIX 1 SERIAL COMMANDS__________________________________________________________
VAISALA _________________________________________________________________________ 99
PRES Setting the pressure for pressure compensation
and ppm calculations
PRES pppp.pp <cr>
pppp.pp= absolute pressure (hPa)
If the process pressure differs from the normal ambient pressure, the value has
to be entered in the transmitter memory in order to ensure the best possible
accuracy. The pressure setting is used for pressure compensation of the
DMP248 transmitter. The pressure also strongly effects the ppm
v
value. The
pressure is always given in hPa/mbar; for pressure conversion, see Appendix 8.
When the command is given, the transmitter first gives the currently used
pressure; after this a new value can be entered or the old one acknowledged.
>PRES <cr>
Pressure : 1013.25 ? 1000.00 <cr>
When the currently used pressure is known, a new pressure can also be entered
directly:
>PRES 1010 <cr>
Pressure : 1010
NOTE
If the security lock jumper is not connected, the pressure
compensation is made with the value 1013.25 hPa.
NOTE
If the pressure setting is frequently adjusted, e.g. by using an external
barometer as a pressure input source, the command XPRES is
recommended.
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