Chromatographic Symptoms 3
Agilent 7890 Series Troubleshooting 69
2
Measure the actual detector flow rates. See “To Measure a
Detector Flow”. If the actual hydrogen, makeup, and
capillary column flows are lower than the display, the jet is
becoming plugged. See “To Check for a Plugged FID Jet”.
Replace the jet.
3 Check that column is properly installed. Reinstall it. See To
Install a Capillary Column in the FID. Make sure the column
is installed all the way to the tip and withdrawn 1–2 mm
(column id > 100 μm).
4 Check inlet parameters that control venting, such as split
ratio and splitless purge delay time. Make sure the sample is
not being inadvertently vented.
5 Perform inlet maintenance (replace all consumable parts)
and pressure test the inlet when completed. See the
maintenance manual and “Checking for Leaks”.
6 Perform complete FID maintenance. Disassemble the FID
and clean or replace all parts. Refer to the following:
• To Perform Maintenance on the FID Collector Assembly
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