Troubleshooting - BrandTech Scientific seripettor Instrucciones De Manejo

Troubleshooting

Problem
Piston is diffi cult to move
Instrument does not draw
in liquid
Instrument does not
dispense liquid
Air bubbles in the instrument
Dispensed volume is too low
Liquid above piston seal
Possible cause
- Formation of crystals
- Dispensing of incompatible liquid
- Valve not correctly mounted
- Wrong dispensing cartridge
- Volume adjusted to minimum setting
- Filling tube blocked or not mounted correctly
- Sticking fi lling valve
- Dispensing cartridge worn
- Sticking discharge valve
- Not primed properly
- Dispensing cartridge worn
- Reagent with high vapor pressure has been
drawn in too quickly
- Air not expelled from the instrument
- Filling tube not fi rmly connected or damaged
- Valves not fi rmly connected or damaged
- Discharge tube not fi rmly connected or damaged
- Filling tube not fi rmly connected or damaged
- Valves not fi rmly connected or damaged
- Piston damaged
Corrective action
- Replace dispensing cartridge.
- Check for operating exclusions (➤ page 30).
- Mount valve correctly.
- Mount compatible dispensing cartridge.
- Set to required volume (➤ page 13).
- Push the fi lling tube on fi rmly, cut off the end diagonally.
- Clean fi lling valve (➤ page 19). If necessary, replace the valve
and sealing washer (observe Operating Exclusions ➤ pages 8 - 9).
- Replace dispensing cartridge (➤ page 16).
- Clean discharge valve. If necessary replace discharge valve.
- Prime the instrument (➤ page 13).
- Replace dispensing cartridge (➤ page 16).
- Release piston slowly.
- Purge the air (➤ page 13).
- Follow normal cleaning procedure (➤ page 18). Push the fi lling
tube on fi rmly. If necessary, cut off approx. 1 cm of tube at the
upper end and re-connect it or replace fi lling tube.
- Follow normal cleaning procedure (➤ page 18). Tighten the valves.
If necessary, replace the valves and sealing washers.
- Push the original manufacturer's discharge tube on fi rmly.
Replace a deformed or damaged discharge tube.
- Normal cleaning procedure (➤ page 18). Push the fi lling tube on
fi rmly. If this does not suffi ce, cut off approx. 1 cm of the tube at
the upper end and re-connect it or replace fi lling tube.
- Clean the instrument (➤ page 18). Tighten the valves.
If necessary, replace valves and sealing washers.
- Replace dispensing cartridge (➤ page 16).
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