6. Commissioning, operation
18
WIKA Operating Instruction, model CPP4000-X
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Wear safety goggles!
Protect eyes from flying particles and liquid splashes.
5.5
Procedure
1.
Fit instrument to be tested to a test connection.
2.
Connect the reference measuring instrument to the other test connection.
5.5.1
To apply pressure
For pressures up to 140 bar (2,000 lb/in²)
1.
Close valve B (valve A remaining open).
2.
Wind spindle pump handle clockwise. This will generate pressure up to approximately 140 bar
or 2,000 lb/in², as handle is wound in. When handle becomes stiff to rotate this will indicate that
the pressure limit for this range has been reached.
For pressures above 140 bar (2,000 lb/in²)
1.
Close Valve A and open valve B.
2.
Continue to wind spindle pump handle clockwise. This will generate pressure up to
approximately 4,000 bar or 60,000 lb/in².
5.5.2
During calibration
Increase the pressure via the spindle pump in the clockwise direction, or use the fine adjustment to
approach the individual calibration points.
The display of the pressure measuring instrument being tested can be compared with the reference
measuring instrument at the individual calibration points.
Information
If there are still small air particles within the system, the generated test pressure will
initially drop and must be readjusted accordingly.
With higher pressures, a longer waiting time than with lower pressures should be
expected until the steady-state condition has been reached.
5.6
Completion
1.
After the test is finished wind spindle pump handle anti-clockwise to lower pressure.
2.
Gently open valve A or B to release residual pressure.
3.
Ensure that both valves A and B are fully open.
4.
Remove device under test.
The system is now ready for another test and any residual pressure is relieved.
