Maintenance and Troubleshooting | 6-25
If the PMT signals are outside their normal range of operation after the
Auto-Setup is complete, check for the following:
• Adjust the Lamp Max setting slightly (typical range is 4500–7800 mV)
and start another Auto-Setup.
• Was the Auto-Setup done with Zero gas flowing through the sample
system?
• Are the Measuring Cell Windows clean?
• Are the PMT signals weak?
• Are the PMTs in their original sockets (is the higher gain PMT in the
Measure path)?
• Is the PMT Buffer board faulty?
• Do the source lamps need replacement (weak lamps)? If not, are the
source lamps aligned?
• If the lamps were replaced, is the correct socket connected to the cor-
rect lamp? Lamp 1 is the closest to the Optical Bench board.
• Have there been any leaks from the Measuring Cell? If so, check the
condition of the Optical Filters, Beam Splitter, Mirrors, Windows,
Lenses, and o-rings in the Optical Bench and in the Measuring Cell
(including Reflector Block). Contact AMETEK for procedures not dis-
cussed in this manual.
Refer to the “Troubleshooting and Diagnostics” section in this chapter
for alarm conditions and corrective action.
NOTE
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