168 Installation, Operation, and Maintenance
Part 3, Maintenance and Troubleshooting
10 Troubleshooting
Symptom: Variability
Figure 70 Retention times or areas are not reproducible
Table 2 6 Variability problems
Possible cause Action
Inlet septum is leaking. If the septum is leaking, replace it. If the septum you replaced
experienced less than 200 injections, check for the following
possible problems to prevent premature septum failure:
• The septum retainer nut is too tight.
• The syringe needle is not straight.
• The syringe is not installed correctly.
Syringe is worn or dirty. If the syringe looks dirty or the plunger is sticking, clean the
syringe with an appropriate solvent or follow the syringe
manufacturer’s cleaning instructions.
Sample volume is too low or too
high.
Check sample level. If the sample vials are not filled correctly,
evaporation or contamination may affect the analysis. The
sample level hold be approximately half the volume of the vial.
See “Filling sample vials” on page 112.
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