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Troubleshooting
Dépannage ��������������������������������������27
Diagnóstico de problemas ���������������28
故障排除 ������������������������������������������29
Устранение неполадок ������������������30
There is a drop in system pressure when the Volume
EN
Controller has been pressurized and the Fill Valve is closed
If there is a drop in system pressure when the Volume Controller has
been pressurized and the Fill Valve is closed, then there is a leak. Fol-
low these instructions to locate and repair the leak:
1� Connect the Volume Controller to a Device Under Test (DUT) and
connect a Ralston Quick-test™ hose to the Inlet Port.
2� Make sure the process connections are assembled wrench-tight.
3. Close Vent Valve�
4� Open Balance and Fill Valves�
5� Apply pressure to unit.
6� Close Fill Valve�
7� Spray soapy water or leak detection fluid where leaks are suspected or
immerse the Volume Controller in water. Be careful not to immerse the
pressure gauge or calibrator�
8� Observe where the bubbles are coming from to determine where there
is a leak.
9� Remove the leaking part and remove the O-ring.
10� Clean and lubricate the O-ring, and backup ring if applicable.
11� Replace the O-ring, and backup ring if applicable.
12� Reassemble�
Fine Adjust Valve is difficult to operate
If the Fine Adjust Valve is difficult to operate over years of service, then
the inside walls of the piston need grease.
1� Remove the Fine Adjust Valve.
2� Apply a thin coat of graphite grease, such as Dow Corning
Moly-kote G-n Metal Assembly Paste (or equivalent) to the inside
walls of the piston.
3. Reassemble�
The Volume Controller does not adjust pressure
If the Volume Controller does not adjust pressure, check the Equalize /
Isolate valve seat for damage or debris.
1� Remove the Equalize / Isolate valve from the front of the panel.
2� Clean and inspect the valve stem tip�
3. Clean and inspect the valve seat�
4� Replace the valve if damaged.
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Solução de problemas ���������������������31
Diagnostica ��������������������������������������33
Fehlerbehebung ������������������������������34
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