48 1100 Series WS MWS Reference Manual
2 Optimizing Performance
General Recommendation to Lowest Carry-over
• Prime flush pump daily for 3 minutes with appropriate solvent previous to
the first run.
• Set needle wash in flush port to at least 10 seconds.
• Use previously described injector program (page 47) as injection mode if
carry-over is significantly higher than 0.01 %.
• 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. The liquid
leaves the seat via the drainage for the flush port.
• Clean the needle seat with a tissue and remove all liquid from it.
• RESET the injector.
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