Fid Baseline Output Above 20 Pa - Agilent Technologies 7890 Series Troubleshooting Manual

3
Chromatographic Symptoms

FID Baseline Output Above 20 pA

72
• Verify the purity of the carrier and detector gas supply. See
the Agilent GC, GC/MS, and ALS Site Preparation
• 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.
detector.
• Check that the FID leakage current is < 2.0 pA. (See
Measure FID Leakage
Bake out
Current".)
Agilent 7890 Series Troubleshooting
Guide.
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