7
Diagnostics and Troubleshooting
Troubleshooting
126 TSQ Quantum XLS Series User Guide Thermo Scientific
Issue: Poor compound
sensitivity.
Possible causes/solutions
• The syringe, injection port liner, and column depth in the injector are incorrectly
matched. For the correct combination, refer to the TRACE GC Ultra Operators Manual.
• Sample delivery is insufficient due to a plugged syringe needle. Clean or replace the
syringe.
• The injection port liner is contaminated. Clean or replace the injection port liner.
• Graphite or septa particles contaminate the injection port. Clean the injection port.
• The injector or septum is leaking. Replace septum and perform leak check on the GC.
• The capillary column is at the end of its life span. Replace the capillary column.
• Method development problems are present. Contact Thermo Fisher Scientific Technical
Support.
Issue: Sensitivity is
unstable or shows
decrease with repeated
injections.
Possible causes/solutions
• The GC temperature ramp does not continue to a high enough temperature to elute high
boiling point compounds. Multiple injections cause these compounds to accumulate in a
column, reducing sensitivity. Extend the upper temperature or the time at upper
temperature in the GC oven ramp.
• The ion volume or lenses are contaminated. Clean the ion volume and lenses as described
in “Cleaning Ion Source Components” on page 85.
• The ion source temperature is too low and causes the ion source to contaminate too
quickly. Clean ion volume and lenses as described in “Cleaning Ion Source Components”
on page 85 and then raise ion source temperature.
• There is a problem with the filament emission current control. See “Filament and Lens
Control Issues” on page 119 for more information.
• The electron multiplier is faulty. Contact Thermo Fisher Scientific Technical Support.
• The injection port liner or capillary column is contaminated. Replace the injection port
liner and trim the capillary column.
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