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Troubleshooting
Detector-Related Problems
Table 5. Detector-related problems (Sheet 1 of 4)
Symptom
Spikes on baseline.
Thermo Scientific
This chapter contains helpful information for troubleshooting possible detector and
chromatographic system problems. The information is organized in a table of symptoms,
possible causes, and remedies. Because many of the problems attributed to the detector might
actually be due to other components in the chromatographic system, references and potential
solutions to these types of problems have also been included.
Contents
•
Detector-Related Problems
•
Log Entries
Table 5
lists detector-related problems along with suggestions for corrective action.
Cause
Continuous gas bubbles in the
LightPipe flowcell.
Immiscible solvent bubbles following
mobile phase changeover.
Electrical interference.
Extremely large fluctuations in voltage
on power line.
Remedy
Degas the mobile phase. Connect a backpressure
device to the LightPipe flowcell (check
backpressure rating).
Flush the LightPipe flowcell with 2-propanol,
then with mobile phase.
Check the electrical lines for good connections,
interference from broadcast radiation, or both.
Check for ground loops.
Remove systems that can cause voltage
fluctuations, for example, ovens; isolate the
detector to a "quiet" circuit; or use an
uninterruptible power supply (UPS) that is safety
certified (UL, TUV, SEMKO, DEMKO, and so
on).
Accela PDA Detector Hardware Manual
7
97
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