Metrohm 877 Titrino plus - Manual (Page 109)

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9 Troubleshooting
877 Titrino plus
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9 Troubleshooting
9.1 SET titration
Problem Cause Remedy
The titration will not
be finished. The minimum dosing rate
is too low. Define Titration rate = user and increase
minimum rate (Min. rate) (see Chapter 7.2.4,
page 86).
The stop criterion is unsuit-
able. Adjust the control parameters (see Chapter
7.2.4, page 86):
￭ Increase the stop drift.
￭ Select a short delay time.
The sample is over-
titrated. The control parameters are
unsuitable. Adjust the control parameters (see Chapter
7.2.4, page 86):
￭ Select Titration rate = slow.
￭ Define Titration rate = user and increase
the control range.
￭ Define Titration rate = user and reduce
maximum rate (Max. rate).
￭ Define Titration rate = user and reduce
minimum rate (Min. rate).
￭ Stir faster.
￭ Arrange the electrode and buret tip to an
optimum.
The electrode responds too
slowly. Replace the electrode.
The titration time is
too long. The control parameters are
unsuitable. Adjust the control parameters (see Chapter
7.2.4, page 86):
￭ Select Titration rate = optimal or fast.
￭ Define Titration rate = user and reduce
the control range.
￭ Define Titration rate = user and increase
maximum rate (Max. rate).
￭ Define Titration rate = user and increase
minimum rate (Min. rate).
The results are
spread widely. The minimum dosing rate
is too high. Define Titration rate = user and reduce min-
imum rate (Min. rate) (see Chapter 7.2.4,
page 86).