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Agilent Technologies Manuals
Laboratory Equipment
7890 Series
Troubleshooting manual
Chromatographic Symptoms - Agilent Technologies 7890 Series Troubleshooting Manual
Gas chromatograph
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Also See for 7890 Series
:
Advanced operation manual
(246 pages)
,
Quick reference manual
(4 pages)
,
Installation checklist
(8 pages)
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Contents
Table of Contents
Troubleshooting
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Table of Contents
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Agilent 7890 Series Gas Chromatograph
Troubleshooting
3
Chromatographic Symptoms
Retention Times Not Repeatable
Peak Areas Not Repeatable
Contamination or Carryover
Larger Peaks Than Expected
Peaks Not Displayed/No Peaks
Baseline Rise During Oven Temperature Program
Poor Peak Resolution
51
Peak Tailing
52
Peak Boiling Point or Molecular Weight Discrimination Poor
Sample Decomposition in Inlet/Missing Peaks
Peak Fronting
56
Noisy Detector, Including Wander, Drift, and Baseline Spikes
Microcell Electron Capture Detector (uECD) Noise and Sensitivity
Low Peak Area or Height (Low Sensitivity)
FID Flame Goes Out During a Run and Attempts to Reignite
FID Baseline Output Above 20 pA
FID Baseline Output at Maximum (~8 Million)
FPD Flame Goes Out During a Run and Attempts to Reignite
FPD Quenching/Repeatability
FPD Output Too High or Too Low
FPD Low Peak Areas
77
FPD Large Peak Width at Half-Height
FPD Baseline Output High, > 20 pA
NPD Solvent Quenching
NPD Response Low
81
NPD Baseline Output > 8 million
NPD Adjust Offset Process Not Functioning Properly
NPD Low Selectivity
85
Negative Peaks Seen with TCD
TCD Baseline Has Dampened Sinusoidal Noise Trailing Peaks (Ringing
Baseline)
87
TCD Peaks Have Negative Dip on Tail
Agilent Technologies
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