
7
8. Troubleshooting
Trouble
Possible causes
Action to be taken
Aspirating and/or
Dispensing not
possible
Sticking valves
Clean the dispenser
(see chapter 7)
Air is aspirated / air
bubbles appear in
the discharge tube
Intake or discharge tube not
fi
rmly connected
Push on intake or discharge
tube more
fi
rmly. Screw on
securing nut more
fi
rmly.
Wrong or damaged intake or
discharge tube
Use only original parts
Plunger button
moves stif
fl
y
Formation of crystals
Clean the dispenser
(see chapter 7)
Dispensed volume
is too low
Vacuum inside
buffer bottle
Valves are leaking
Pressure compensation chan-
nel is blocked.
Dispensing too fast
Clean the dispenser
(see chapter 7)
Check the pressure compen-
sation channel and clean it if
necessary.
Observe dispensing speed.
If the measures do not help, send your dispenser to your local supplier for service.
Please give full details of the fault and liquids dispensed. Clean the dispenser accord-
ing to the normal procedure before despatching it back.
7.2. Cleaning procedure
1. Mount the empty dispenser (see chapter 7.1.) on a bottle
fi
lled with water.
2. Place a suitable vessel below the discharge tube.
3. Rinse the dispenser by repeated dispensing movements.
4. Completely empty the dispenser (see chapter 7.1.).
5. Assembling and priming as described in chapter 4 and 5.
English