Metrohm 900 Touch Control Manual - Manual (Page 500)

31.6 Miscellaneous
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900 Touch Control
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 900 Touch Control.
2. Connect the hardware correctly.
3. Switch the 900 Touch Control back on.
The required hardware is
being used in the ongoing
determination. Wait until the determination is finished.
31.6 Miscellaneous
Problem Cause Remedy
The 900 Touch Con-
trol cannot be
switched on. The Touch Control is con-
nected to an MSB socket
on the control device. Plug in the Touch Control at the Controller
connector (see manual for control device).
31.7 SET titration
Problem Cause Remedy
The titration will not
be finished. The minimum dosing rate
is too low. Define Titration rate = user and increase the
minimum rate (Min. rate) (see Chapter
29.3.2, page 310).
The stop criterion is unsuit-
able. Adjust the control parameters (see Chapter
29.3.2, page 310):
￭ 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
29.3.2, page 310):
￭ Select Titration rate = slow.
￭ Define Titration rate = user and increase
the control range.
￭ Define Titration rate = user and reduce
the maximum rate (Max. rate).
￭ Define Titration rate = user and reduce
the minimum rate (Min. rate).
￭ Stir faster.
￭ Arrange the electrode and buret tip to an
optimum .
The electrode responds too
slowly. Replace the electrode.