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CONFIGURATION
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PIPETMAN® M
Changing the Seal and/or O-ring
The O-ring is positioned on the piston; it should not be
autoclaved, if worn or damaged in any way, it must be replaced
(refer to Chapter 20
on page 32).
To access the O-ring, remove the tip ejector and unscrew the
lower part of the tip holder. You should now be able to remove
the O-ring from the piston. Sometimes, the O-ring may be found
in the recess at the top end, of the lower part of the tip holder. If required, lubricate the
piston (refer to
on page 25), and then fit a new O-ring by
sliding it onto the piston. Reassemble the pipette. Depending on the pipette model the
dimensions of the O-ring will vary (refer to Chapter 20
on page 32).
Servicing the Piston
You may remove the piston assembly to clean, lubricate, or change the piston.
Removing the Piston
1.
Remove the tip ejector and (optionally)
the lower part of the tip holder. If you
remove the lower part, take care to
remove the O-ring as described in
Changing the Seal and/or O-ring
above.
2. Unscrew the connecting nut (turn by hand,
counterclockwise).
3. Gently remove the connecting nut and upper
tip holder.
4. Pull off the piston assembly from the body of the pipette — separate the parts
(see below).
5. Clean and autoclave (if required) the piston and holder, together with any
other parts that may need to be treated in the same way (refer to Chapter 15
on page 26).
6. Lubricate the piston, refer to Figure 18 on page 25.
7. Reassemble the piston and guide; then carefully insert the assembly into the
body of the pipette. The guide should hold the piston assembly inside the body of
the pipette. You can hear a
“click” when the piston is back in place.
O-ring
NOTE
The specifications of the pipette should be checked after changing any part.
In the case of P1200M, the piston holder, piston, and guide are a unit — do
not try to separate them.
NOTE
Take care not to touch the piston, and that it is dust-free. If needed, clean
the assembly with a dust-free cloth.
Figure 16
O-ring
Figure 17
Piston
.
NOTICE
Don't pull on the piston to remove the assembly.
