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e.
12.3 Dislodging a stick valve ball
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e.
Clean the filling valve and sealing ring (ultrasonic bath)
or replace them.
f.
Insert the cleaned or new sealing ring, if necessary.
g.
Screw in the filling valve first by hand and then tighten
it with the assembly tool (1/4 turn is sufficient!).
If the instrument does not fill up, and if some elastic resis-
tance is evident when the piston is pulled upward, then it is
possible that the valve ball is stuck.
In this case, dislodge the valve ball using light pressure; for
example, with a 200 µl plastic pipette tip.
12 Cleaning
81
Operating manual
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