Dislodging A Stick Valve Ball; Replacing The Dispensing Cartridge - BRAND Dispensette S Mode D'emploi

9 Cleaning
a.
9.3.2.2 Replacing the filling valve
b.

9.3.2.3 Dislodging a stick valve ball

9.4 Replacing the dispensing cartridge

The dispensing cartridge is a wear part and must be replaced according to the specific conditions of
use. The replacement interval depends, for example, on the medium used and number of dispensing
cycles, whereby replacement is to be expected after 10,000 full strokes (medium: distilled water). If
drops of media are observed on the outside of the dispensing cylinder or in the retaining ring, immedi-
ately check the instrument and, in case of doubt, replace the dispensing cartridge.
52
Operating manual
a.
After disassembling the discharge tube (see Replacing
discharge tube, p. 51), use the assembly tool to unscrew
the discharge valve.
b.
Firmly screw in the new discharge valve first by hand
and then tighten it with the assembly tool. The thread
should not be visible.
a.
Pull out the recirculation tube and the telescopic filling
tube.
b.
Use the assembly tool to unscrew the filling valve.
c.
Screw in the new filling valve first by hand and then
tighten it with the assembly tool.
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).
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