Trouble Shooting - BRAND Transferpette Series Operating Manual

Trouble Shooting

Problem
Pipette tip leaks or
volume too low
Poor sample aspiration
Volume too large
Pipetting key moving
stiffly
Possible Cause
- Tip does not sit properly
- Damaged V-ring (O-ring) on single
nose cone
- Piston damaged
- Seal dirty, damaged
- Instrument is dirty
- Non-aqueous solutions pipetted
- Single nose cone clogged
- Pipetting key pressed too far down
into the blow-out stroke before
aspirating liquid.
- Key movement reduced
- 32 -
Corrective Action
- Press tip on firmly. Use only suitable
high-quality tips, page 8.
- Replace V-ring (O-ring) on nose cones.
"Repairs", pages 26-28.
- Replace piston.
"Repairs", pages 24, 25.
- "Repairs", pages 22, 23.
- Clean instrument.
"Cleaning", page 19.
- "Adjustment", page 14.
- Clean nose cone. Remove cones only;
do not disassemble instrument!
"Cleaning" page 19.
- Operate pipette properly.
"Operating the pipette", page 10.
- Lubricate piston and centrale guide rod
with the appropriate grease,
pages 13, 34.