Troubleshooting, English – BrandTech Scientific Dispensette III User Manual

Page 57

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English

57

Troubleshooting

Problem

Possible cause

Corrective action

Piston difficult
to move

Formation of crystals, dirty

Stop dispensing immediately. Loosen piston with
circular motion, but do not disassemble. Follow all
cleaning instructions (page 48-50).

Filling
not possible

Volume adjusted to
minimum setting

Set to required volume
(see page 41).

Filling valve stuck

Clean the filling valve.If the valve is stuck use
a 200 µl pipette tip to loosen it (see page 50).
If necessary replace the filling valve with sealing
washer.

Dispensing
not possible

Discharge valve stuck

Clean discharge valve. If necessary replace
discharge tube. (see page 50).

Air bubbles in
the instrument

Reagent with high vapor
pressure has been drawn
in too quickly

Slowly draw in reagent.

Seal not inserted, knurled
locking nuts not firmly
connected

Double check that seal is in place, and that the
knurled locking nuts at the discharge tube and
the SafetyPrime

recirculation valve are firmly

seated and finger tight.

The instrument has not
been primed

Prime the instrument (see page 41).

Filling tube is loose or
damaged

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.

Valves not firmly connected
or damaged

Cleaning procedure (see page 48-50). Tighten
the valves using the mounting tool. If necessary,
replace the valves and sealing washers.

Recirculation tube not
connected

Connect recirculation tube (see page 38, Fig. 3).

Dispensed volume
is too low

Discharge tube is loose

Push the discharge tube on firmly.

Filling tube is loose
or damaged

Cleaning procedure (see page 48-50). 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 50).

Filling valve is loose
or damaged

Cleaning procedure (see page 48-50). Tighten
the valves using the mounting tool. If necessary,
replace filling valves and sealing washers.

Leaking liquid
between instrument
and bottle

Recirculation tube not
connected

Connect recirculation tube (see page 38, Fig. 3).

Volatile reagent dispensed
without sealing ring for valve
block

Mount sealing ring for valve block
(see page 43).

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