Troubleshooting - BRAND seripettor Operating Manual

10 Troubleshooting

10 Troubleshooting
Problem
Piston sluggish
Liquid is above the
dosing piston
Filling not possible Valve incorrectly installed
Dispensing not
possible
Air bubbles in the
instrument
Dispensed volume
too low
76
Operating manual
Possible cause
Crystal deposits
Forbidden liquid dispensed Clarify whether the medium is permitted to be dis-
Dispensing cartridge leaky Replace dispensing cartridge, see Replacing the dis-
Volume adjusted to mini-
mum setting
Filling valve stuck
Dispensing cartridge leaky Replace dispensing cartridge, see Replacing the dis-
Discharge valve stuck
Reagent with high vapor
pressure has been drawn in
too quickly
Valve screw connections
loose
The instrument has not
been primed
Filling tube is loose or dam-
aged
Valves not firmly connected
or damaged
Discharge tube is loose or
damaged
Filling tube is loose or dam-
aged
Filling valve is loose or dam-
aged
Frequent dispensing > 40 ºC Replace dispensing cartridge, see Replacing the dis-
Corrective action
Replace dispensing cartridge, see Replacing the dis-
pensing cartridge, p. 72).
pensed, see Dispenser Selection Chart.
pensing cartridge, p. 72.
Correctly install valve, see Cleaning and replacing
valves, p. 69.
Set the desired volume, see Dispensing, p. 61.
Unscrew the filling valve from the valve block and
clean it. If the valve ball is stuck, use a 200 µl plastic
tip to dislodge it (Dislodging a stick valve ball, p. 72).
If necessary, replace the filling valve.
pensing cartridge, p. 72).
Unscrew the discharge valve from the valve block,
clean it and replace if necessary. If the valve ball is
stuck, use a 200 µl plastic tip to dislodge it.
Slowly draw in reagent.
Tighten the valves firmly with the assembly tool.
Prime the instrument, see First Steps, p. 57
Push the filling tube on firmly. If necessary cut off ap-
prox. 1 cm of tube at the upper end and re-connect it
or replace filling tube.
Perform cleaning, see Cleaning, p. 68. Tighten the
valves using the assembly tool.
Correctly install the discharge tube. Replace de-
formed or damaged discharge tube.
Perform cleaning, see Cleaning, p. 68. Push the filling
tube on firmly. If that is insufficient, cut off approx.
1 cm of tube at the upper end or replace the filling
tube.
Perform cleaning, see Cleaning, p. 68. Tighten the
filling valve. If necessary, replace the valve with seal-
ing ring, see Cleaning and replacing valves, p. 69.
pensing cartridge, p. 72).
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