Metrohm 870 KF Titrino plus Manual - Manual (Page 77)

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9 Troubleshooting
870 KF Titrino plus
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9 Troubleshooting
9.1 Karl Fischer titration
Problem Cause Remedy
The drift is very high
during conditioning. The titration cell is leaking. ￭ Check seals and septum. If necessary,
replace.
￭ Replace molecular sieve.
The drift becomes
greater after each
titration. The sample releases water
very slowly. ￭ Adjust the method.
￭ Add solubilizer.
￭ Increase the temperature (possibly using a
KF oven).
￭ See technical literature.
A side reaction is taking
place. ￭ Use special reagents.
￭ Adjust the method (increase/decrease the
temperature, external extraction).
￭ See technical literature.
The pH value is not in the
optimum range anymore. Add buffer, see technical literature.
The titration will not
be finished. The titration cell is leaking. ￭ Check seals and septum. If necessary,
replace.
￭ Replace molecular sieve.
The minimum increment is
too low. Define Titration rate = user and increase the
minimum volume increment (Min. incre-
ment) (see Chapter 7.1.3, page 53).
The stop criterion is unsuit-
able. Adjust the control parameters (see Chapter
7.1.3, page 53):
￭ Increase the stop drift.
￭ Select a short delay time.
See also: The drift increases
after each titration.