172 Installation, Operation, and Maintenance
Part 3, Maintenance and Troubleshooting
10 Troubleshooting
You are using a packed inlet and a
530-µm column.
Check your inlet. Capillary columns used with packed inlets
have some inherent sample discrimination characteristics.
See “Suggestions for Packed Inlets with 530-µm Columns” on
page 184.
There is a leak in the GC system. Replace the septum and check the fitting for leaks. If the
leaking septum has experienced less than 200 injections.
To prevent future premature failures, be sure that:
• The septum retainer nut is not too tight.
• The syringe needle is straight.
• The syringe is installed correctly.
• The injector is aligned to the injection port (7673 only).
See “Installing a Syringe” on page 103.
Sample is not stable. Some samples change with heat or ultraviolet light. Check the
sample stability. There are several ways to reduce the change:
• Use the tray quadrants to cool the sample.
• Use amber sample vials.
• Store the samples in a protected environment.
Vial caps are loose. Check the vial caps. Loose vial caps can cause selective loss
of lighter materials from a sample. The cap should not rotate
easily if installed properly. See “Capping sample vials” on
page 113.
Table 2 8 Peak size problems (continued)
Possible cause Action
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