4 Troubleshooting
Poor Peak Resolution 28
Peak Tailing 29
NPD 29
Peak Boiling Point or Molecular Weight Discrimination Poor 30
For any inlet operating in split mode with any detector 30
For any inlet operating in splitless mode with any detector 30
Sample Decomposition in Inlet/Missing Peaks 31
Peak Fronting 32
Noisy Detector, Including Wander, Drift, and Baseline Spikes 33
Noisy baseline 33
Baseline wander and drift 34
Baseline spiking 34
Figure 1. Cyclic spiking 35
Figure 2. Random spiking 35
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
4 GC Not Ready Symptoms
GC Never Becomes Ready 54
Flow Never Becomes Ready 55
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