8
PIPETMAN® P
6 GENERAL GUIDELINES FOR GOOD
PIPETTING
Make sure that you
operate the pushbutton slowly and
smoothly.
When aspirating,
keep the tip at a
constant depth
below the surface
of the liquid (refer
to the table).
Change the tip before aspirating a different liquid,
sample, or reagent.
Change the tip if a droplet remains at the end of
the tip from the previous pipetting operation.
Each new tip should be pre-rinsed with the liquid
to be pipetted.
Liquid should never enter the tip-holder; to
prevent this:
- press and release the push-button slowly and
smoothly,
- never turn the pipette upside down,
- never lay the pipette on its side when there is
liquid in the tip.
If you use the same tip with a higher volume,
pre-rinse the tip.
For volatile solvents you should saturate the
air-cushion of your pipette by aspirating and
dispensing the solvent repeatedly before
aspirating the sample.
When pipetting liquids with temperatures
different to the ambient temperature, pre-rinse
the tip several times before use.
You may remove the tip-ejector (see Chapter 11 -
Maintenance) to aspirate from very narrow tubes.
Table - Immersion Depth
and Wait Time
Model Immersion Wait Time
Depth (mm) (seconds)
P2 1 1
P10 1 1
P20 2-3 1
P100 2-4 1
P200 2-4 1
P1000 2-4 2-3
P5000 3-6 4-5
P10mL 5-7 4-5