Agilent 1260 Infinity II Preparative Autosampler User Manual 101
Optimizing Performance
6
Optimization for Lowest Carry-over
General Recommendation to Lowest Carry-Over
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 additional wash vial 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:
• In LabAdvisor go to Maintenance > Change Needle: this will set 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
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. Again be careful
not to risk an injury by the uncovered needle.
• Reinstall the safety cover of the sampler.
• In LabAdvisor, go to Maintenance > Change Needle and finish the procedure.
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