Troubleshooting - BRAND Titrette Mode D'emploi

Troubleshooting

Problem
Piston difficult to move
Filling not possible
Filling not possible /
liquid is drawn back into the
titrating tube during filling
Air bubbles in the instrument
Titrating not possible
The volume delivered is
smaller than that indicated
The instrument doesn't
indicate any function
64
Possible cause
Piston/cylinder assembly is con-
taminated or damaged by crystalline
deposits
Filling valve stuck
The discharge valve is
contaminated or the titrating
tube has been damaged
Instrument filled too quickly
Filling tube is loose or dam-
aged
Filling valve is loose or the
seal possibly has not been
inserted
Filling tube does not dip into
the liquid
Recirculation tube is not mounted
or mounted improperly
Discharge valve stuck
The instrument has not been
completely primed
Seal might not have been
inserted or the filling valve is
loose
Filling valve is blocked or
damaged
Internal error
Corrective action
Immediately stop the titration
and perform a cleaning; replace
the piston/cylinder assembly, if
necessary (see page 54 ff).
Clean the filling valve, and then
use a plastic pipette tip (200 µl)
to loosen the ball valve if it is
stuck (see page 60).
Clean the discharge valve or
exchange the titrating tube
(see page 56).
Fill instrument slowly
Fasten the telescoping filling
tube firmly. If necessary, cut the
tube off approx. 1 cm from the
top or replace it.
Check whether the seal has been
inserted, and fasten the valve
securely with the mounting tool.
Fill up the bottle, or correctly
adjust the length of the telescop-
ing filling tube.
Attach the recirculation tube.
The opening must point outward
toward the bottle wall.
Clean or exchange the titrating
tube with its integrated discharge
valve (see page 56).
Prime the instrument again
(see page 41).
Check whether the seal has been
inserted, and fasten the valve
securely with the mounting tool.
Clean, and if necessary replace
the filling valve (see page 60).
Perform a restart: remove the
batteries, wait 1 minute and then
replace them (see page 61).