Generation Of Vacuum - WIKA CPP 7 Betriebsanleitung

Hand test pump
CPP 7

4.2 Generation of vacuum

 Make sure, the pressure relief and change over valve for pressure/vacuum (3) is in „VENT"
position.
Fine adjustment valve (2)
Pressure relief and change
over valve for
pressure/vacuum (3)
 Turn the fine adjustment valve (2) clockwise up to the end ("stop" can be felt)
 Turn the pressure relief and change over valve (3) to „VACUUM" position.
 Operate the ram (5) of the hand pump until the approximate vacuum has been achieved.
 Turn the fine adjustment valve anti-clockwise to increase the vacuum or clockwise to decrease the
vacuum until the requested vacuum has been reached precisely (to be read on the reference
measuring instrument).
 A vacuum reduction is achieved by turning the fine adjustment valve (2) clockwise first and
then by carefully switching the change-over valve (3) to "VENT" position.
WIKA Operating Instructions Hand test pump Version 1.0
Downloaded from www.Manualslib.com
NOTE: After increasing the vacuum, the reading may slightly increase again for about
30 seconds, which is caused by thermodynamic effects, the tube connection and the
sealing gaskets. If the vacuum drop does not come to a standstill, check the
measuring circuit for tightness.
Due to the low volume of each compression stroke of the hand test pump, only small
volume test specimens should be tested.
Remove the reference instrument or the test specimen only when the relief
valve (3) is open and no vacuum is in the test pump any more.
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3 positions
VACUUM VENT PRESSURE
GB
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