5 maintenance – Eppendorf Research plus User Manual

Page 18

5 Maintenance

Eppendorf Research® plus — Operating manual

Opening and assembling the lower part (≤1 000 μL)

Hint!

To avoid confusion of parts, only disassemble and assemble one pipette at a time.

Opening the lower part:

1. On the piston mount (1) push the locking mechanisms

together slightly.

2. Remove the piston mount.
3. Remove the piston (2) and the piston spring (3). The

piston is under spring tension. Pistons and piston springs

will look different 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 in 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 locking mechanisms on the piston mount

pressed with the other hand.

4. Mount the piston mount in such a way 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 engages

audibly.

2. Set the maximum volume and operate the control button

several times. It must run smoothly and resistance-free.

3. Keep the ejector pressed. The ejector rod protrudes from

the upper part.

4. Fit the ejector sleeve onto the ejector rod. It is fitted

correctly if it engages slightly.

5. Carry out a gravimetric test of the systematic and random

This test ensures that no parts were confused during

assembly and that the pipette has been assembled correctly.

nance