WIKA CPP30 - Handbuch (Seite 7)

WIKA Betriebsanleitung Hand-Held Thermometer 7
GB
11044608.02 07/2006 D/GB
WIKA Operating Instructions Test Pump
Test Pump
CPP30
Operate the hand pump (5) until the approximate pressure has
been reached, but max. to 20 to 25 bar.
Turn the fine adjustment valve clockwise to increase the
pressure or anti-clockwise to decrease the pressure until the
requested test pressure has been reached precisely (to be read
on the reference measuring instrument).
If you have prepared at previous step a pressure of about
20 to 25 bar, with the fine adjustment valve (2) you can increase
the pressure now to 35 bar (up to 40 bar, depending on the volume
of the measuring circuit).
After increasing the pressure, the reading may slightly drop again
for about 30 seconds, which is caused by thermodynamic effects,
the tube connection and the sealing gaskets. If the pressure 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.
A pressure reduction is achieved by turning the fine adjustment
valve (2) counter-clockwise first and then by carefully opening
the relief valve (3).
Never actuate the change-over valve when the hand test pump
is under pressure or vacuum! Actuate the change-over valve
only when the relief valve is open.
Remove the reference instrument or the test specimen only
when the relief valve (3) is open and no pressure is in the hand
test pump any more.