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30 Troubleshooting
917 Coulometer
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291
30.6 Titration stand with pump
Problem Cause Remedy
Solvent is added at
the same time dur-
ing aspiration.
The adsorber tube is
blocked.
ï¿ Enlarge the hole of the drying tube cover
to 2 mm at least.
ï¿ Refill the adsorber tube, pack not too
tightly, perhaps remove some of the molec-
ular sieve.
The pump conveys
no liquid.
The add/aspirate key is not
pressed tightly enough.
ï¿ Usually the bottle attachments are not
screwed tightly enough to the reagent and
waste bottles.
ï¿ Check all connections for leak-tightness.
The solvent flows on
into the titration
vessel after the
addition, without
the add key being
pressed.
The solvent bottle is not
positioned correctly.
Position the solvent bottle in such a way that
the liquid level in the bottle is lower than that
in the titration vessel.
30.7 Coulometric Karl Fischer titration
Problem
Cause Remedy
The drift is very high
during conditioning.
The titration cell is leaking. ï¿ Check the septum and replace it if neces-
sary.
ï¿ Replace the molecular sieve.
ï¿ 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.
ï¿ Shake the titration cell.
The reagent is exhausted
or contaminated.
ï¿ Replace the reagent.
The catholyte is old or
moist.
ï¿ The catholyte must be replaced at least
once per week.
ï¿ Dry the catholyte with KF one-component
reagent.
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