Troubleshooting - BRAND Dispensette S Mode D'emploi

Problem
Liquid is above the
piston
Piston difficult
to move
Filling
not possible
Dispensing
not possible
Discharge tube or
discharge tube with re-
circulation valve cannot
be mounted sufficiently
Air bubbles in
the instrument
Dispensed volume
is too low
Liquid leaking at the
safety ring
Leaking liquid
between instrument
and bottle
Possible cause
Piston is leaking.
Formation of crystals, dirty
Volume adjusted to
minimum setting
Filling valve stuck
Discharge valve stuck
Discharge valve is not
screwed in deeply enough
Reagent with high vapor
pressure has been drawn in too
quickly
Screw couplings loose
The instrument has not
been primed
Filling tube is loose or
damaged
Valves not firmly connected
or damaged
Recirculation tube not
connected
Filling tube is loose
or damaged
Filling valve is loose, con-
taminated, or damaged
Dispensing cartridge is loose,
or the piston seal is damaged
Recirculation tube not con-
nected
Volatile reagent dispensed
without sealing ring

Troubleshooting

Corrective action
Perform a standard cleaning, replace the piston/
cylinder assembly (see page 41-44).
Stop dispensing immediately. Follow all cleaning
instructions (page 41).
Set to required volume (see page 35).
Clean the filling valve.If the valve is stuck use a
200 µl pipette tip to loosen it (see page 43). If
necessary, replace the filling valve.
Unscrew the discharge valve from the valve
block, clean it, use a 200 µl plastic tip to loosen
any ball valve that is stuck, replace the discharge
valve if necessary (see page 43).
Tighten the discharge valve with the mounting
tool until it meets the stop so that the threads are
no longer visible.
Draw in reagent slowly.
Tighten valve with the mounting tool
Prime the instrument (see page 34).
Push the filling tube on firmly. If necessary, cut
off approx. 1 cm of tube at the upper end and
re-connect it or replace filling tube.
Follow cleaning procedure (see page 41-43).
Tighten the valves firmly using the mounting tool.
Connect recirculation tube (see page 32, Fig. 2).
Cleaning procedure (see page 41-42). Push the
filling tube on firmly. If necessary, cut off approx.
1 cm of the tube at the upper end and re-con-
nect it or replace filling tube.
Cleaning procedure (see page 41-42). Tighten
the valves using the mounting tool. If necessary,
replace filling valves.
Tighten the safety ring, and if necessary replace
the dispensing cartridge
Connect recirculation tube (see page 32, Fig. 2).
Mount sealing ring ('Accessories', page 37).
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