WIKA Obsolete CPH65I0 Betriebsanleitung Seite 28

6 Commissioning, operation
To perform a switch test, the following steps must be taken:
1) Switch to SETUP 4 (standard switch test). SETUP 4: The upper display is set to [P1] ST, all
other displays are switched off.
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2) Connect the calibrator to the pressure switch using the switch terminals. The polarity of the
terminals does not matter. Then connect the pump to the calibrator and the pressure
switch.
3) Open the vent button on the pump and zero the calibrator. Then close the vent after re-
setting the calibrator.
4) The top of the display will indicate "CLOSE".
5) Apply pressure with the pump slowly until the switch opens.
6) Once the switch is open, "OPEN" will be displayed; bleed the pump slowly until the
pressure switch closes.
7) In the top display it will now read "SW OPENED AT" and give you the pressure at which the
switch opened.
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The pressure Switch Test can be performed with the following functions [P1] ST,
[P2] ST.
In the switch test mode the display update rate is increased to help capture
changing pressure inputs. Even with this enhanced sample rate the device under
test should be charged slowly with pressure in order to ensure accurate readings.
WIKA Operating Instruction, Model CPH65I0