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Agilent Technologies 7890 Series - FID Baseline Output above 20 Pa

Agilent Technologies 7890 Series
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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”.)

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