Agilent InfinityLab LC Series Vialsamplers User Manual 170
5 Optimizing Performance
Optimization for Lowest Carryover
General Recommendation for Lowest Carryover
For samples where the outside of the needle cannot be cleaned sufficiently with
the wash port use wash vials with an appropriate and stronger solvent. An
injector program and an extra wash vial can be used for cleaning.
In case the needle seat has got contaminated and carryover is significantly
higher than expected, the following procedure can be used to clean the needle
seat:
• In Lab Advisor go to Maintenance> Change Needle: this sets the needle into
home position.
• Remove the safety cover of the sampler. Be carefully not to risk an injury by
the uncovered needle.
• Pipette an appropriate solvent on to the needle seat. The solvent should be
able to dissolve the contamination. If the contamination is unknown, use two
or three solvents of different polarity. Use several milliliters to clean the seat.
• Clean the needle seat with a tissue and remove all liquid. Again be careful not
to risk an injury by the uncovered needle.
• Reinstall the safety cover of the sampler.
• In Lab Advisor, go to Maintenance> Change Needle and finish the procedure.
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