Gilson Pipetman Ultra U2 User Manual page 17

2) Gently rotate the
tip-ejector counter-
clockwise and sep-
arate its connector
from the activating
rod.
3) Pull the tip-ejector away from the body of the
pipette.
4) Clean or autoclave the tip-ejector and refi t it (or a
new one) by reversing the procedure.
Changing the Tip-holder (lower part)
After removing the tip-ejector, you may remove
the lower part of the tip-holder, which is more likely
to become contaminated or damaged than the upper
part. Removal of the lower part is shown below; for the
upper part see "Removing the Piston" (special precau-
tions are necessary).
1) Gently rotate the
lower part of the tip-
holder counterclock-
wise to unscrew it
from the upper part.
2) Separate the parts and remove the O-ring (see
"Changing the O-ring").
3) Clean and if required autoclave the lower part of
the tip-holder.
4) If required lubricate
the piston (see "How to
Lubricate the Piston")
and fi t a new O-ring.
5) Screw the two parts together, making sure that the
two parts are fully tightened, by hand.
6) Refi t the tip-ejector.
Changing the seal and/or O-ring (see Chapter 18)
The O-ring is contained by the two halves
of the tip-holder; it must not be autoclaved,
if worn or damaged in any way, it must
be replaced.
Tip-holder (upper)
Tip-holder (lower)
Piston
O-ring
17