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PGC5000
PGC5000 Series Service Instructions
5.9 Upgrading software
Software upgrades may be available through the ABB Support on a need basis. Please follow the reporting guidelines as
described in the Section 8 of these instructions.
5.10 Optional discharge ionization detector
The Discharge Ionization Detector (DID) consists of a detector unit and a power supply (see Figure 5.11).
Detector Unit
Fig. 5.11. Discharge Ionization Detector
This procedure describes general troubleshooting procedures, issues and resolutions for the optional Discharge Ionization
Detector.
Verify that:
•
System has power.
All switches and gas settings are at the correct positions.
•
Column has proper flow rates and pressures.
•
•
Plasma shield is in place on the reactor.
•
Plasma center rod is grounded to the oven chassis.
•
Bias tube is connected to a bias voltage source.
Identify whether the problem is with the oven or the detector. In general, if the problem is with retention times but not
sensitivity, look for problems with the oven, especially the valves or column connections.
Next determine the last thing done to the system. In general, this is the best place to begin the troubleshooting process.
If these steps identify that the problem is with the detector, use the following subsections to identify and correct the problem.
5.10.1 Plasma will not light
No power: If the fuse is good, contact ABB customer support for further assistance.
Air in plasma: The presence of too much air in the plasma will often cause the plasma not to light. Allow the system to purge
with the reaction gas for at least 15 minutes. If the plasma still will not initiate, check for air leaks in all of the fittings.
Back pressure too high: If a restriction in the exhaust line is too high, the detector plasma will not light. Replace the
exhaust/signal tube with a new one and see if the plasma will light.
Wrong plasma gas: If there is another gas besides helium or argon, the plasma will not light.
5.10.2 No signal
No power to plasma power supply: If the fuse is good, contact ABB customer support for further assistance.
Verify power to plasma: Observe the plasma tube with the lights off. There should be a pink or almost white glow in the
plasma tube. If the tube is very blue and the signal is low, there is nitrogen in the plasma. This may be because the wrong
SI/PGC5000-EN, Rev B
Power Supply
5 Diagnostics and troubleshooting
33
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Troubleshooting
