Vaisala HMP243 Podręcznik Użytkownika Pobierz pdf (Strona 89)

HMP240

M210300en Appendix 1: Serial commands

The time can be set in seconds within the range of 0 - 1024 (0 = no averaging

time).

For example:

>FILT <cr>

Filter (S): 0 ? 1024

>FILT 100 <cr>

Filter (S): 100

PRES Setting the pressure for mixing ratio and wet bulb

temperature calculations

PRES pppp.pp <cr>

pppp.pp= pressure (hPa)

The atmospheric pressure has an effect on mixing ratio and wet bulb

temperature. Therefore, accurate calculations can be achieved only when the

ambient pressure is taken into consideration. The pressure is used for pressure

compensation of the HUMICAP



sensor in order to ensure the best possible

measurement accuracy.

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 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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Vaisala HMP243 Podręcznik Użytkownika Strona 89