Troubleshooting; Corrective Action - BRAND Dispensette S Instrucciones De Manejo

Problem
Piston moves with
difficulty or is stuck
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
Leaking liquid
between instrument
and bottle
Possible cause
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
Valve screw connections loose Tighten the valves firmly with the mounting tool.
The instrument has not
been primed
Filling tube is loose or
damaged
Valves not firmly connected
or damaged
Filling tube is loose
or damaged
Filling valve is loose
or damaged
Recirculation tube not
connected
Volatile reagent dispensed
without sealing ring

Troubleshooting

Corrective action

Stop dispensing immediately. Loosen piston with
circular motion, but do not disassemble. Follow all
cleaning instructions (page 49-52).
Set to required volume (see page 43).
Unscrew the filling valve from the valve block,
clean it, replace the filling valve if necessary. If
the valve is stuck use a 200 µl pipette tip to
loosen it (see page 52). If necessary replace the
filling valve with sealing washer.
Unscrew the discharge valve from the valve
block, clean it, replace the discharge valve if
necessary (see page 51), use a 200 µl plastic
tip to loosen any ball valve that is stuck.
Tighten the discharge valve with the mounting
tool until it meets the stop so that the threads
are no longer visible.
Slowly draw in reagent.
Prime the instrument (see page 42).
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.
Cleaning procedure (see page 49-52). Tighten
the valves using the mounting tool.
Cleaning procedure (see page 49-52). Push the
filling tube on firmly. If necessary, cut off approx.
1 cm of the tube at the upper end and re-connect
it or replace filling tube (see page 51).
Cleaning procedure (see page 49-52). Tighten
the valves using the mounting tool. If necessary,
replace filling valves.
Connect recirculation tube (see page 38, Fig. 3).
Mount sealing ring (see page 45).
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