72 Agilent 7890 Series Troubleshooting
3 Chromatographic Symptoms
FID Baseline Output Above 20 pA
• Verify the purity of the carrier and detector gas supply. See
the Agilent GC, GC/MS, and ALS Site Preparation Guide.
• Inspect the column for column bleed. Lower the oven
temperature to ambient. If the detector output drops
significantly, suspect a contaminated or bleeding column or
contaminated carrier gas. Confirm column bleed by turning
off column flow (with oven cool) and checking the detector
output.
• Check the gas supply trap indicators/dates and ensure that
the traps are not expended.
• Verify that the detector was reassembled properly after
recent maintenance.
• Inspect the detector for contamination. Bake out the
detector.
• Check that the FID leakage current is < 2.0 pA. (See “To
Measure FID Leakage Current”.)
To Next Page
Loading...
Need help?
General
