Agilent Technologies 5975T LTM GC/MSD, Руководство по устранению неисправностей и техническому обслуживанию

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4 Troubleshooting and Maintenance Guide
Contamination or Carryover 37
Isolate the source 37
Check possible causes—all inlet and detector combinations 37
Larger Peaks Than Expected 38
Peaks Not Displayed/No Peaks 39
No peaks 39
Low Boiler Peaks Present/High Boiler Peaks are Missing 41
Baseline Rise During LTM Column Temperature Program 42
Baseline is rising 42
Baseline is high 42
Baseline is falling 42
Baseline wanders 43
Poor Peak Resolution 44
Peak Tailing 45
Peaks are tailing 45
Peak Boiling Point or Molecular Weight Discrimination Poor 46
For any inlet operating in split mode 46
For any inlet operating in splitless mode 46
Sample Decomposition in Inlet/Missing Peaks 47
Peak Fronting 48
Peaks are fronting 48
Peaks have flat tops 48
Peaks have split tops 49
Noisy Signal, Including Wander, Drift, and Baseline Spikes 50
Noisy baseline 50
Baseline wander and drift 51
Baseline spiking 51
Retention times for all peaks drift – shorter 52
Retention times for all peaks drift – longer 52
Poor sensitivity 53
Low Peak Area or Height (Low Sensitivity) 54
Mass Spectral Symptoms 55
No peaks 55
Isotopes are missing or isotope ratios are incorrect 55
High background 55
High abundances at m/z 18, 28, 32, and 44 or at m/z 14 and 16 55
Mass assignments are incorrect 56
Peaks have precursors 56
Peak widths are inconsistent 56