4 Agilent 7890 Series Troubleshooting
Corrosion in FID Collector and Ignitor Glow Plug 33
FPD Does Not Ignite 34
NPD Adjust Offset Process Fails 36
NPD Bead Will Not Ignite 37
FPD
+
Temperature Will Not Become Ready 38
Blinking Not Ready Light: Detector Hardware Fault/TCD Filament
Voltage 39
Shutdown (Defective) Device 40
3 Chromatographic Symptoms
Retention Times Not Repeatable 42
Peak Areas Not Repeatable 43
Contamination or Carryover 44
Isolate the source 44
Check possible causes—all inlet and detector combinations 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
NPD Peak Tailing 53
Peak Boiling Point or Molecular Weight Discrimination Poor 54
For any inlet operating in split mode with any detector 54
For any inlet operating in splitless mode with any detector 54
Sample Decomposition in Inlet/Missing Peaks 55
Peak Fronting 56
Noisy Detector, Including Wander, Drift, and Baseline Spikes 57
Noisy baseline 57
Baseline wander and drift 59
Baseline spiking 60
Microcell Electron Capture Detector (uECD) Noise and Sensitivity 63
Display signal evaluation 63
Sensitivity 65
Contamination (high baseline) 66
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