Rev B 2022/03
91
CyBio Well vario
Operation
7.4
Specific System Details (Pipetting Head)
Aspiration and dispensing of liquid is accomplished by piston motion. All piston suspension
points have a mechanical freeplay (slackness). This means: After each reversal in piston
motion direction, the piston drive initially covers a certain travel length without actually
moving the pistons, and, hence, without aspirating or dispensing any liquid. This motion
length corresponds to the freeplay.
In order to prevent dosing errors, a volume cycle is organized in such a way that the piston
reversal point lies outside of the actual pipetting range (motion into zero-position, aspira-
tion with additional stroke) or is corrected by suitable compensatory motion (dispensing
with additional stroke).
7.4.1
Aspiration With Additional Stroke
Fig. 117: Aspiration with additional stroke
This is the recommended standard procedure for precise pipetting.
Piston motion starts in zero-position (1) and continues beyond the position that corre-
sponds to nominal pipetting volume. The pistons are then lowered back into this position
(2). The amount of freeplay (3) is excluded by this procedure. At the time of direction
reversal, an additional volume (D1) is dispensed. Due to piston reversal, this volume is
smaller than the aspirated additional stroke volume (A2). The tip retains the nominal
pipetting volume (D2) and a residual volume (D3).
Exact volumes can be dispensed in the next step (4) (in a single step or a multi-step
sequence). After the nominal pipetting volume has been dispensed, the pipetting tip will
contain the residual volume (D3) that results from upper direction reversal. This volume is
1 Zero-position
2 Aspirate volume with additional
stroke and reverse piston direction
3 Upper freeplay
4 Exactly dispense volume (single
volume or partial volumes)
5 Residual dispensing
6 Motion to zero-position
A1 = D2: nominal pipetting volume
A2: additional aspiration volume
D1: additional volume being dispensed <
A2 (additional stroke)
D2: nominal pipetting volume
D3: residual volume (proportional to free-
play)
D4: Air
Summary of Contents for Analytik Jena CyBio Well vario
Page 1: ...User Manual CyBio Well vario ...
Page 3: ...Rev B 2022 03 III CyBio Well vario ...
Page 5: ...Rev B 2022 03 V CyBio Well vario ...
Page 6: ...VI Rev B 2022 03 CyBio Well vario ...
Page 7: ...Rev B 2022 03 VII CyBio Well vario ...
Page 8: ...VIII Rev B 2022 03 CyBio Well vario ...
Page 12: ...XII Rev B 2022 03 CyBio Well vario ...
Page 16: ...XVI Rev B 2022 03 CyBio Well vario ...
Page 26: ...10 Rev B 2022 03 Technical Specifications CyBio Well vario ...
Page 62: ...46 Rev B 2022 03 Technical Description CyBio Well vario ...
Page 118: ...102 Rev B 2022 03 Troubleshooting CyBio Well vario ...
Page 126: ...110 Rev B 2022 03 Decommissioning CyBio Well vario ...
Page 130: ...114 Rev B 2022 03 Accessories Spare Parts CyBio Well vario ...
Page 132: ...116 Rev B 2022 03 Waste Disposal CyBio Well vario ...
Page 142: ...126 Rev B 2022 03 CyBio Well vario ...