21
Agilent 6890N Gas Chromatograph
Troubleshooting
Agilent Technologies
3
Chromatographic Symptoms
Retention Times Not Repeatable 22
Peak Areas Not Repeatable 23
Contamination or Carryover 24
Larger Peaks Than Expected 25
Peaks Not Displayed/No Peaks 26
Baseline Rise During Oven Temperature Program 27
Poor Peak Resolution 28
Peak Tailing 29
Peak Boiling Point or Molecular Weight Discrimination Poor 30
Sample Decomposition in Inlet/Missing Peaks 31
Peak Fronting 32
Noisy Detector, Including Wander, Drift, and Baseline Spikes 33
Check for the correct jet. Low Peak Area or Height 36
FID Flame Goes Out During a Run and Attempts to Reignite 38
FID Baseline Output Above 20 pA 39
FPD Flame Goes Out During a Run and Attempts to Reignite 40
FPD Output Too High or Too Low 41
FPD Low Peak Areas 42
FPD Large Peak Width at Half-Height 43
FPD Baseline Output High, > 20 pA 44
NPD Solvent Quenching 45
NPD Response Low 46
NPD Baseline Output > 8 million 47
NPD Adjust Offset Process Not Functioning Properly 48
NPD Low Selectivity 49
Negative Peaks Seen with TCD 50
TCD Baseline Has Dampened Sinusoidal Noise Trailing Peaks (Ringing
Baseline) 51
TCD Peaks Have Negative Dip on Tail 52
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