BRAND Dispensette S Operating Manual page 74

9 Cleaning
9.3.2 Replacing valves
9.3.2.1 Replacing the discharge valve
The discharge valve has a safety ball that closes automatically when the discharge tube is removed.
Attaching the discharge tube reopens the safety ball.
a.
9.3.2.2 Replacing the filling valve
a.
b.
9.3.2.3 Dislodging a stick valve ball
74
Operating manual
Always install the valve intended for the particular instru-
ment model and size! (See ordering data, Ordering Informa-
tion, p. 79) Identical filling valves but different discharge
valves are used for Dispensette® S and Dispensette® S Or-
ganic. For easy identification, the discharge valves for the
Dispensette® S Organic are marked with 'ORG'.
NOTICE
a.
After disassembling the discharge tube (see Replacing
discharge tube, p. 73), 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).
NOTICE
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