Metrohm 900 Touch Control Manual - Manual (Page 503)

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31 Troubleshooting
900 Touch Control
￭￭￭￭￭￭￭￭ 487
31.9 STAT titration
Problem Cause Remedy
The control point is
not kept stable. The control parameters are
unsuitable. Adjust the control parameters (see Chapter
29.7.2, page 354):
￭ Define Titration rate = user and reduce
the minimum rate (Min. rate).
￭ Define Titration rate = user and increase
the control range.
The stirring rate is too low. Stir faster.
The arrangement of elec-
trode and buret tip is not
optimum. Arrange the electrode and buret tip to an opti-
mum (see manual of control device).
The cylinder volume of the
exchange/dosing unit is
too large. Use an exchange/dosing unit with a smaller
cylinder volume (yields a smaller minimum vol-
ume increment).
The electrode responds too
slowly. Replace the electrode.
It takes an unex-
pectedly long time
for the control point
to be reached. The control parameters are
unsuitable. Adjust the control parameters (see Chapter
29.7.2, page 354):
￭
￭ Define Titration rate = user and reduce
the control range.
￭ Define Titration rate = user and increase
the minimum rate (Min. rate).
￭ Define Titration rate = user and increase
the maximum rate (Max. rate).