Venting The System - WIKA CPP7000-X Bedienungsanleitung

6. Commissioning, operation

6.1.3 Venting the system

After the clamping of the test specimen and the reference instrument, air may be trapped in the
system. The system may be vented before beginning with calibration using the following procedure:
The test specimen and the reference instrument must be clamped
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Close the low-pressure shut-off valve
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Open the high-pressure shut-off valve
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Generate a pressure of approximately 50 bar (725 psi) using the initial pressure pump
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Close the high-pressure shut-off valve
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Increase the pressure with the spindle pump until just below the final value of the measuring
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range of the test specimen or of the reference instrument (the smaller pressure range is the
decisive factor).
Carefully open the high-pressure shut-off valve, any trapped air will escape into the tank
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Open the low-pressure shut-off valve
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This procedure may need to be repeated several times in order to remove all trapped air.
Opening the high-pressure shut-off valve without first turning out the spindle pump in
counterclockwise direction in order to relieve the system on initial pressure is permitted only with the
venting procedure described herein.
WARNING!
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 (1,450 psi)) additionally protects
the low-pressure circulation from any errors on the operator's part.
The device is now ready to use.
WIKA Operating Instruction, model CPP7000-X
EN
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