￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
31 Troubleshooting
900 Touch Control
￭￭￭￭￭￭￭￭
491
Problem Cause Remedy
The parameter Min. rate
is set too low.
￭ Set the parameter Min. rate higher.
￭ Reset the Control parameters to default
values.
The results are
spread widely.
The sample is nonhomoge-
nous.
￭ Homogenize the sample if possible.
￭ Possibly use a larger sample size.
The sample addition is diffi-
cult to reproduce.
￭ Observe the instructions in .
The drift fluctuates. ￭ Ensure stable drift.
31.10 STAT titration
Problem
Cause Remedy
The control point is
not kept stable. The
measured value is at
times too high and
at times too low.
The controller "oscil-
lates".
The control parameters are
unsuitable.
Adjust the control parameters (see chapter
29.7.2, page 356):
￭ Reduce the Max. rate and possibly also
the Min. rate.
￭ Increase control range.
The stirring is not optimal. Check and optimize efficiency of the stirring.
The arrangement of elec-
trode and buret tip is not
optimum.
Arrange the electrode and buret tip to an opti-
mum (see manual of the instrument).
The cylinder volume of the
exchange/dosing unit
might be too large.
Use an exchange/dosing unit with a smaller
cylinder volume (yields a smaller volume incre-
ment per pulse).
The control point is
not reached for too
long.
The control parameters are
unsuitable.
Adjust the control parameters (see chapter
29.7.2, page 356):
￭ Reduce control range.
￭ increase Min. rate.
￭ increase Max. rate.
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