Agilent Technologies 7890A - FID Baseline Output Above 20 pA

44 Troubleshooting
3 Chromatographic Symptoms
FID Baseline Output Above 20 pA
• Verify the purity of the carrier and detector gas supply.
• Inspect the column for column bleed.
• 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.
• Check that the FID leakage current is < 2.0 pA. (See “To
Measure FID Leakage Current”.)