WIKA A2G-45 - Manual (Page 12)

WIKA operating instructions air2guide model A2G-45
GB
12
40389228.01 09/2012 GB/D/F/E/I
Zero point adjustment
Attention!
Connect the voltage supply one hour before making the
zero point adjustment.
■ Remove both hoses from the pressure connections ⊕ and ⊖.
■ Press both the "up" and "down" buttons simultaneously, or select
"Zero" in the setting menu:
⇒ the green LED switches off and "Zero" is shown in the display.
■ Wait until the green LED switches back on, then reconnect the ⊕ and
⊖ pressure connections.
In normal operation, we recommend that a zero point adjustment is
carried out every 12 months.
Span calibration
Attention!
Connect the voltage supply one hour before making the
span calibration.
A reference pressure measuring instrument is needed for the span
setting.
The span should not be set without pressure being present. If the span
is set with either no test pressure, or too-low a pressure, the instrument
will lose its accuracy and no longer give correct measured values.
If this should occur, select the menu point "Span" and then select
"Reset", in order to reset the span setting.
6. Commissioning, operation