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11. Troubleshooting
Symptom Possible cause Solution
Droplets left
inside the tip
Unsuitable tip Use original
Sartorius tips
Non-uniform wetting
of the tip plastic
Attach new tip
Leakage or pipetted
volume too small
Tip incorrectly
attached
Attach firmly
Unsuitable tip Use original
Sartorius tips
Foreign particles
between tip and cone
Clean the tip cone,
attach new tip
Instrument
contaminated
Clean and grease
O-ring and piston,
clean the tip cone
Insufficient amount of
grease on piston and
O-ring
Grease accordingly
O-ring not correctly
positioned or damaged
Change the O-ring
Incorrect operation Follow instructions
carefully
Calibration altered
or unsuitable for the
liquid
Recalibrate
according to
instructions
Instrument damaged Send for service
Push button
jammed or moves
erratically
Piston contaminated Clean and grease
O-ring and piston,
clean the tip cone
Penetration of solvent,
vapours
Clean and grease
O-ring and piston,
clean the tip cone
Pipette blocked,
aspirated volume
too small
Liquid has penetrated
tip cone and dried
Clean and grease
O-ring and piston,
clean the tip cone
Tip ejector jammed
or moves erratically
Tip cone and/or ejector
collar contaminated
Clean the tip cone
and the ejector
collar