Vaisala HUMICAP HMP155 User's Guide download pdf (Page 38)

USER'S GUIDE____________________________________________________________________

36 _______________________________________________________________ M210912EN-C

Pressure Compensation Commands

PRES and XPRES

Use the PRES serial line command to set ambient pressure value for

fixed pressure compensation. If the value is changed frequently, use the

XPRES serial line command. Its value is cleared to 0.0 at reset; if it is set

to other than 0, it overrides the setting given with the

PRES command.

NOTE

In normal pressure conditions, PRES command is not needed. But if

mixing ratio is used in high altitudes, the pressure changes will increase

the mixing ratio.

Use the serial line and do the following:

PRES [a.aaaa]

where

a.aaaa = Ambient pressure value (bar)

Example:

>pres

Pressure : 1.013 bar ?

XPRES [a.aaaa]

where

a.aaaa = Ambient pressure value (bar)

Example:

>xpres

Pressure: 0.000 bar ?

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Vaisala HUMICAP HMP155 User's Guide Page 38