WIKA CPP1600-X - Handbuch (Seite 14)

Comparison Test Pump GB
CPP 3000-X / CPP 5000-X / CPP 7000-X
WIKA Operating Instructions Comparison Test Pump Version 2.1 14
V. Slow lowering of the pressure
Leak in the system, see fault III.
If small amounts of air are compressed in
the system together with medium, the test
pressure that has been generated first
drops off slightly. After this it must be
readjusted.
If the system is pressurised quickly, it
takes a certain time (< 1 minute) until it
can stabilise thermally. The pressure
should then be adjusted accordingly.
After the clamping of the test specimen
and the reference instrument, air may be
trapped in the system, see point VI.
Afterwards, build the pressure back up.
Further help can be found through WIKA's Test & Calibration Technology Department.