Metrohm 915 KF Ti-Touch - Manual (Page 349)

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30 Troubleshooting
915 KF Ti-Touch
￭￭￭￭￭￭￭￭ 335
Problem Cause Remedy
A button in the
manual control is
disabled. The required hardware is
either not connected or
incorrectly connected. 1. Switch off the 915 KF Ti-Touch.
2. Connect the hardware correctly.
3. Switch the 915 KF Ti-Touch back on.
The required hardware is
being used in the ongoing
determination. Wait until the determination is finished.
30.6 Titration stand with pump
Problem Cause Remedy
Solvent is added at
the same time dur-
ing aspiration. The drying tube is blocked. ￭ Enlarge the hole of the drying tube cover
to 2 mm at least.
￭ Refill the drying tube, pack not too tightly,
perhaps remove some of the molecular
sieve.
The pump conveys
no liquid. The add/aspirate key is not
pressed tightly enough. ￭ Usually the bottle attachments are not
screwed tightly enough to the reagent and
waste bottles.
￭ 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 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 the molecular sieve.
The drift becomes
greater after each
titration. The sample releases water
very slowly. ￭ Adjust the method.
￭ Add solubility promoter.
￭ Increase the temperature (possibly using a
KF oven).
￭ See technical literature.