BRAND seripettor Mode D'emploi page 72

8 Cleaning
Discharge valve
b.
8.3 Dislodging a stick valve ball
8.4 Replacing the dispensing cartridge
The dispensing cartridge is a wear part. In case of sluggishness or leakage between cylinder and pis-
ton, the dispensing cartridge must be replaced. To prevent injuries due to chemical exposure, clean-
ing must be performed before replacing the dispensing cartridge (see Cleaning, p. 68).
b.
72
Operating manual
The discharge valve is built into dispensing tube.
a.
Dismantle the dispensing tube and clean in an ultra-
sonic bath if necessary.
b.
Install cleaned or new dispensing tube.
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 (see the figure at
the side).
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 (see the figure at
the side).
a.
Screw the instrument onto an empty bottle and empty
it completely by dispensing multiple times.
b.
With one hand, press the actuating unit downward all
the way and hold it. Loosen the volume selector thumb
screw by a half turn, slide the pointer vertically to the
upper stop and re-tighten the volume thumb screw.
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