Inficon Micro GC Fusion 2-Module Operating Manual page 296

11 | Troubleshooting
11.2.1.3.4.2 Peak Tailing
11.2.1.3.4.3 Deformed Peak Apex
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The peak rises sharply, then falls normally to baseline.
Tailing is usually caused by column overload. Reduce the sample Inject (ms) time. If
using a variable volume or fixed volume injector, do not reduce the Inject (ms) time to
less than 15 ms to avoid repeatability issues.
Tailing could also result from two (or more) closely unresolved peaks. Decrease the
column temperature by 30°C and repeat the analysis. If peaks separate at the lower
temperature, the tailing was caused by unresolved peaks.
Tailing can also be caused by a low Sample Inlet Heater Temperature. Increase the
Sample Inlet Heater Temperature and repeat the analysis.
Top (apex) of the peak is deformed or flat.
A deformed peak apex is usually caused by detector saturation. Reduce the sample
Inject (ms) time. If using a variable volume or fixed volume injector, do not reduce the
Inject (ms) time to less than 15 ms to avoid repeatability issues.
A deformed peak apex can also result from a detector Sensitivity set to High. Ensure
that the Sensitivity is set to Standard. Sensitivity setting is not applicable for the FAST
Enabled Micro GC Fusion.
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