BrandTech Scientific Dispensette III - Manual (Page 57)

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).