WIKA CPP1600-X - Handbuch (Seite 11)

Comparison Test Pump GB
CPP 3000-X / CPP 5000-X / CPP 7000-X
WIKA Operating Instructions Comparison Test Pump Version 2.1 11
3.2 Operation .
The maximum permissible pressure for the CPP 3000-X is 3,000 bar, for the CPP
5000-X 5,000 bar and for the CPP 7000-X 7,000 bar. Higher pressures may
damage the pump. The reference instrument, test specimen and any connecting
tubes that are used must not be subjected to pressures above the maximum
permissible level.
3.2.1 Increasing the pressure .
We recommend unscrewing the spindle pump completely when you start to record
measurement values, (turning anticlockwise) to allow enough volume for
measurements. The low-pressure and high-pressure shut-off valve must be opened
during this process.
The system must first be filled with oil and pre-compressed.
For this the valves must be in the basic position:
Low-pressure shut-off valve closed
High-pressure shut-off valve opened
Then run the initial pressure pump for several strokes. The pressure increases to a maximum of
about 50 bar (depending on the volume of the connected instruments).
The high-pressure shut-off valve must be closed after pre-pressure generation.
After that, increase the pressure resp. make a fine adjustment by turning the built-in spindle pump
clockwise to approach the calibration points.
After generating initial pressure, the high-pressure shut-off valve must always
be closed, before pressure is increased using the spindle pump. An integrated
safety overflow valve (adjusted to approximately 100 bar) additionally protects
the low-pressure circulation from any errors on the operator’s part.
Now you can compare the indication of the test specimen with the reference instrument at each
calibration point.
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.
A longer waiting time before stable operating conditions are reached should be
expected at higher pressures than at lower pressures.