Eppendorf XplorerPlus - Manual (Page 55)

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Eppendorf Xplorer® (plus) — Operating manual
Opening and assembling the lower part (1 000 μL)
The piston must be in its basic position before separating the lower and upper part. If necessary,
press the rocker down to move the piston to its basic position.
Hint!
To avoid confusion of parts, only disassemble and assemble one pipette at a time.
Opening the lower part:
1. Push the stop pins together slightly on the piston mount (1).
2. Remove the piston mount.
3. Remove the piston (2) and the piston spring (3). The piston is under spring
tension. The appearance of pistons and piston springs will vary for the
individual volume versions.
Assembling the lower part:
1. Carefully guide the piston and the piston spring into the cylinder. Make
sure that the piston is guided correctly in the piston spring and the cylinder.
There must not be any perceptible resistance. Stop pushing as soon as
any resistance is felt This may indicate that the piston is not positioned
correctly in the cylinder. There is a risk of bending the piston if too much
force is applied. Carefully pull out the piston and repeat the process
correctly. In the case of piston springs with double windings (4), these
windings must point downwards.
2. Keep the piston and the piston spring pressed.
3. Keep the stop pins on the piston mount pressed with the other hand.
4. Mount the piston mount so that the two locking mechanisms engage in
their retainers.
5. Gently press a pipette tip against the inserted piston. The piston must
move down in the cylinder without any noticeable resistance.
Installing the lower part and ejector sleeve:
1. Insert the lower part into the upper part until it audibly engages.
2. Set the maximum volume and move the rocker up and down several times.
There should not be any unusual running noises.
3. Keep the ejector pressed. The ejector rod protrudes from the upper part.
4. Fit the ejector sleeve onto the ejector rod. If correctly fitted, it will engage
slightly.
5. Carry out a gravimetric test of the systematic and random error.
This test ensures that no parts were confused during assembly and that the
pipette has been assembled correctly.
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Maintenance