Troubleshooting
Chromatography Problems
117
3. Edit the method parameters to increase the method sensitivity. See
Chapter 7, “Developing Methods”.
4. Check the system for leaks.
5. Check the sample vials for a proper seal (see “Sample Preparation” on
page 56).
6. Check the condition of the needle. Replace it if necessary (see “Changing
the Sampling Needle” on page 89).
7. Check that the sample loop and transfer line temperatures are higher than
the oven temperature.
8. Increase the vial pressurization to insure that the loop is filled.
9. Check the Event Times. Increase the Inject Time.
10. Check that the oven temperature is set high enough to volatilize the
compound of interest.
11. Make sure that the transfer line is hooked up to the GC and inlet in an
appropriate manner.
12. Check the disk needle guide, circle clip, and spring in the injector slot for
wear. Replace them if necessary.
13. Make sure the transfer line is not plugged.
14. Make a syringe injection to be sure that the column and detector are
working properly.
15. Call Agilent service.
Bad Data (Bad Peaks)
Probable Causes
• GC conditions wrong for the sample type.
• Sample not at equilibrium.
• Too much sample injected into the GC.
• Flow too low.
• Sample condensing in the loop, transfer line, or valves.
• Leaks in the system.
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