Troubleshooting
Chromatography Problems
118
• Sample contaminated.
• Sample decomposing. Oven temperature is too high.
• Incomplete sample transfer.
• System contaminated.
Suggested Actions
1. Check the GC settings.
2. Increase the Vial Equilibration Time.
3. Use a smaller sample loop. See “Changing the Sample Loop” on page 92.
4. Use split injection.
5. Increase the Vial Pressurization Time to dilute the sample.
6. Check that the carrier–gas flow rate is high enough for the column type.
See “Developing Methods” on page 70.
7. Check that the loop and transfer line temperatures are higher than the
oven temperature.
8. Check the system for leaks.
9. Lower the oven temperature.
10. Check the sample preparation procedure to check for sources of
contamination. See Chapter 5, “Preparing a Sample” for more
information.
11. Increase the Inject Time.
12. Check the agitation level to prevent splashing material on the septum.
13. Use a heat gun to drive any contamination out of the valves or tubing while
checking the detector response to confirm the location of contamination.
14. Steam clean the system. See “Steam Cleaning the Pneumatic System” on
page 95.
15. Change the valves, regulators, and tubing. Refer to your service manual or
contact Agilent service.
16. Call Agilent service.
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