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31 Troubleshooting
900 Touch Control
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489
31.9 Coulometric Karl Fischer titration
Problem Cause Remedy
The drift is very high
during conditioning.
The titration cell is leaking. ￭ Check the septum and replace it if neces-
sary.
￭ Replace the molecular sieve.
￭ Check the ground-joint sleeves for frayed
edges. If necessary, trim the edges neatly
or replace the ground-joint sleeves.
Deposits containing water
can be found in the titra-
tion cell.
￭ Shake the titration cell.
The reagent is exhausted
or contaminated.
￭ Replace the reagent.
The catholyte is old or
moist.
￭ The catholyte must be replaced at least
once per week.
￭ Dry the catholyte with KF one-component
reagent.
The diaphragm of the gen-
erator electrode is contam-
inated.
￭ Clean the diaphragm (in accordance with
directions in the leaflet for the generator
electrode).
A side reaction is taking
place.
￭ Consider using a KF oven.
￭ See technical literature.
The molecular sieve on the
KF oven has reached its
capacity limit.
￭ Replace the molecular sieve.
The gas flow from the KF
oven into the titration cell
is too high.
￭ Reduce the gas flow (if you are working
with the oven method with sample vials,
set the gas flow between 40 and 60
mL/min).
The drift becomes
greater after each
titration.
The sample releases water
very slowly.
￭ Consider using a KF oven.
￭ See technical literature.
The drift is fluctuat-
ing.
The sample solution is
poorly stirred.
￭ Set the stirring rate in such a way that the
sample solution will become very well
mixed.
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