4 Troubleshooting
Baseline Rise During Oven Temperature Program 32
Poor Peak Resolution 33
Peak Tailing 34
NPD 34
Peak Boiling Point or Molecular Weight Discrimination Poor 35
For any inlet operating in split mode with any detector 35
For any inlet operating in splitless mode with any detector 35
Sample Decomposition in Inlet/Missing Peaks 36
Peak Fronting 37
Noisy Detector, Including Wander, Drift, and Baseline Spikes 38
Noisy baseline 38
Baseline wander and drift 39
Baseline spiking 40
Figure 1. Cyclic spiking 40
Figure 2. Random spiking 40
Low Peak Area or Height (Low Sensitivity) 41
FID Flame Goes Out During a Run and Attempts to Reignite 43
FID Baseline Output Above 20 pA 44
FPD Flame Goes Out During a Run and Attempts to Reignite 45
FPD Output Too High or Too Low 46
FPD Low Peak Areas 47
FPD Large Peak Width at Half-Height 48
FPD Baseline Output High, > 20 pA 49
NPD Solvent Quenching 50
NPD Response Low 51
NPD Baseline Output > 8 million 52
NPD Adjust Offset Process Not Functioning Properly 53
NPD Low Selectivity 54
Negative Peaks Seen with TCD 55
TCD Baseline Has Dampened Sinusoidal Noise Trailing Peaks (Ringing
Baseline) 56
TCD Peaks Have Negative Dip on Tail 57
4 GC Not Ready Symptoms
GC Never Becomes Ready 60
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