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Optimizing Performance
Optimization for Lowest Carry-over
NOTE Overlapped injection together with additional injection valve switching is not
possible.
General Recommendation to Lowest Carry-over
• For samples where needle outside cannot be cleaned sufficiently with
water or alcohol use wash vials with an appropriate solvent. Using an
injector program and several wash vials can be used for cleaning.
In case the needle seat has got contaminated and carry-over is significantly
higher than expected, the following procedure can be used to clean the
needle seat:
• Go to MORE INJECTOR and set needle to home position.
• Pipette an appropriate solvent on to the needle seat. The solvent should be
able to dissolve the contamination. If this is not known use 2 or 3 solvents
of different polarity. Use several milliliters to clean the seat.
• Clean the needle seat with a tissue and remove all liquid from it.
• RESET the injector.
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