Trouble Shooting
Problem
Piston diffi cult to move
Filling not possible
Instrument does not
dispense liquid
Air bubbles in the instrument
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Possible cause
- Formation of crystals, dirty
- Volume adjusted to minimum setting
- Sticking fi lling valve
- Discharge tube closure cap
pushed on
- Discharge tube not fi rmly
connected or damaged
- Reagent with high vapor pressure
has been drawn in too quickly
- Seal not inserted, knurled locking
nuts not fi rmly connected
Corrective action
- Stop dispensing immediately. Loose
piston by circular motion, but do
not disassemble. Follow all cleaning
instructions (➤ p. 21-23).
- Set to required volume (➤ page 16).
- Clean the fi lling valve. If necessary
replace the valve with sealing washer
(➤ page 24).
- Remove closure cap.
- Push on the closure cap. Hold the
piston in place, and push the original
manufacturer's discharge tube on
fi rmly (➤ page 11). Replace a de-
formed or damaged discharge tube
(➤ Accessories and Spare Parts).
- Slowly draw in reagent.
- Double check that seal (R) is in
place, and that the knurled locking
nuts at the discharge tube are fi rmly
seated and fi nger tight.