94
Rev B 2022/03
Operation
CyBio Well vario
7.5
System Precision (Pipetting Head)
The CyBio Well vario works based on the principle of air displacement. This means that 96
or 384 pistons, which are mechanically connected with a common drive, perform motion in
96 or 384 air spaces created by the pipette tips and internal seals. The volume resolution
capability of piston motion corresponds to one tenth, one hundredth or one thousandth of
a micro liter.
The achievable degree of precision is limited and influenced by:
the wettability of tips,
the dimensional stability of their outlet opening,
the way the system and involved liquids are handled.
physical and chemical properties of liquid
the quality of microplates
You are also advised to note the following:
TIP
Liquid is aspirated or dispensed as a result of underpressure or overpressure created by
piston motion. In either case, the process will not be completed before pressure balance
state has been reached. The time required to reach this state depends - among other fac-
tors - on the properties of the liquid being handled. For this reason, adequate pause
times should be included with all operating sequences as necessary.
TIP
When working with dry tips, pressure equalization of a different kind will occur after
filling. It takes a longer to finish, because an air vapor pressure will build up in the air
cushion inside the tip above liquid level, resulting in liquid emerging from the tips.
This can be prevented by triggering a few initial rinse program cycles, until the air inside
the tip is saturated with vapor. Even after a longer downtime with tips in filled condi-
tion, no liquid will emerge on completion of preventive rinsing.
TIP
By wetting the tips with liquid, you may influence the achievable level of precision and
accuracy. As a matter of importance, tips should therefore be submerged into the liquid
volume just as much as necessary for a particular process. In addition, the depth of sub-
mergence should always be the same in multi-cycle mode. This can be achieved by main-
taining a constant reservoir filling level with the help of the sensor-controlled reservoir
pump.
TIP
For precise work results, you are advised to use a non-shedding slightly moistened scrub-
bing towel to dab the tips. You may place the towel onto a standard microplate (for ex-
ample).
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