41
Agilent 7890 Series Gas Chromatograph
Troubleshooting
Agilent Technologies
3
Chromatographic Symptoms
Retention Times Not Repeatable 42
Peak Areas Not Repeatable 43
Contamination or Carryover 44
Larger Peaks Than Expected 47
Peaks Not Displayed/No Peaks 48
Baseline Rise During Oven Temperature Program 50
Poor Peak Resolution 51
Peak Tailing 52
Peak Boiling Point or Molecular Weight Discrimination Poor 54
Sample Decomposition in Inlet/Missing Peaks 55
Peak Fronting 56
Noisy Detector, Including Wander, Drift, and Baseline Spikes 57
Microcell Electron Capture Detector (uECD) Noise and Sensitivity 63
Low Peak Area or Height (Low Sensitivity) 67
FID Flame Goes Out During a Run and Attempts to Reignite 70
FID Baseline Output Above 20 pA 72
FID Baseline Output at Maximum (~8 Million) 73
FPD Flame Goes Out During a Run and Attempts to Reignite 74
FPD Quenching/Repeatability 75
FPD Output Too High or Too Low 76
FPD Low Peak Areas 77
FPD Large Peak Width at Half-Height 78
FPD Baseline Output High, > 20 pA 79
NPD Solvent Quenching 80
NPD Response Low 81
NPD Baseline Output > 8 million 83
NPD Adjust Offset Process Not Functioning Properly 84
NPD Low Selectivity 85
Negative Peaks Seen with TCD 86
TCD Baseline Has Dampened Sinusoidal Noise Trailing Peaks (Ringing
Baseline) 87
TCD Peaks Have Negative Dip on Tail 88
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