Vaisala PTB220 User Manual download pdf (Page 31)

CHAPTER 4_____________________________________________________________ COMMISSIONING

VAISALA _________________________________________________________________________ 25

UNIT Setting the pressure and temperature units

UNIT x <cr>

where (* = factory setting)

x = hPa*

kPa

mbar

inHg

mmHg

torr

mmH

psia

This command is used to set and inspect the pressure and internal

temperature compensation unit. The temperature unit is not confirmed

by the barometer.

Example of changing the pressure and temperature units:

>unit <cr>

P unit : hPa

>unit C <cr>

>send <cr>

1035.19 hPa 25.9 'C

>unit torr <cr>

P unit : torr

>unit F <cr> (temperature unit not confirmed)

>send <cr>

776.44 torr 78.6 'F

HHCP Setting the height of height correction

HHCP x <cr>

The HHCP command is used to give the height for height corrected

pressure. The value is set in meters and the range, which can be used,

is -40...+40 m. Height corrected pressure is calculated according to the

following equation.

hPHCP ⋅= + 1176.0 (4-1)

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Vaisala PTB220 User Manual Page 31