Vaisala PTB220 User Manual download pdf (Page 35)

CHAPTER 4_____________________________________________________________ COMMISSIONING

VAISALA _________________________________________________________________________ 29

Example of defining a similar command without an end character:

>scom <cr>

"P" #r

? "P" <cr>

>P1020.30 hPa

Any previous SCOM definition may be removed with the following

command:

>scom * <cr>

PSTAB Setting the pressure stability indicator

PSTAB x <cr>

where:

x = pressure reading (in current unit)

The PSTAB command is used to define the pressure stability indicator

reflecting maximum allowed pressure difference between two

successive averaged pressure measurements. In addition to defining

the pressure stability indicator, the user must also define the FORM

command to include the "OK" stability indicator field. The factory

setting for the stability indicator level is 0.5 hPa.

>pstab 0.5 <cr>

Stab. level : 0.50 hPa

>form

?4.2P""UUU""OK#r#n

>send <cr>

1020.30 hPa OK (good pressure stability)

>send <cr>

1020.30 hPa (poor pressure stability)

The pressure stability indicator is useful as it indicates instability in

the pressure measurement. The pressure instability may result from

different reasons depending on the application. In outdoor barometric

pressure measurement high wind speeds can induce notable pressure

instability. Building automation systems may also introduce pressure

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Vaisala PTB220 User Manual Page 35