Problem
Possible cause
Corrective action
Troubleshooting
Piston difficult to move
Formation of crystals
Replace dispensing cartridge (page 43).
Dispensing of incompatible
liquid
Check for operating exclusions
('Dispenser selection chart', page 31).
Liquid above piston seal
Dispensing cartridge worn
Replace dispensing cartridge (page 43).
Filling not possible
Valve not correctly mounted
Mount valve correctly (pages 41, 42).
Volume adjusted to minimum
setting
Set to required volume (page 36).
Sticking filling valve
Clean filling valve (pages 41, 42). If nec-
essary, replace the valve and sealing ring
(observe operating exclusions, page 30).
Dispensing cartridge worn
Replace dispensing cartridge (page 43).
Dispensing not possible
Sticking discharge valve
Clean discharge valve. If necessary replace
discharge valve.
Air bubbles in the
instrument
Reagent with high vapor pres-
sure has been drawn in too
quickly
Slowly draw in reagent.
The instrument has not
been primed
Prime the instrument (page 35).
Dispensing cartridge worn
Replace dispensing cartridge (page 43).
Filling tube not firmly con-
nected or damaged
Cleaning procedure (page 40). 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,
contaminated or damaged
Cleaning procedure (page 40). Tighten fill-
ing valve and discharge tube. If necessary,
replace valves and seals.
Dispensed volume
is too low
Discharge tube not firmly
connected or damaged
Push the discharge tube on firmly. Replace a
deformed or damaged discharge tube.
Filling tube not firmly
connected or damaged
Cleaning procedure (page 40). 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.
Filling valve not firmly
connected or damaged
Cleaning procedure (page 40). Tighten filling
valve. If necessary, replace valve and sealing
ring.
Frequent dispensing > 40 ºC Replace dispensing cartridge (page 43).
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