Metrohm 905 Titrando - Manual (Page 39)

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6 Troubleshooting
905 Titrando
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6 Troubleshooting
6.1 General
Problem Cause Remedy
The "On" LED is not
illuminated, even
though the instru-
ment is connected
to the power supply. The Touch Control or the
computer has not been
switched on yet or the
plugs are not correctly
plugged in. 1. Check the plug connections.
2. Switch on the Touch Control or the com-
puter.
6.2 SET titration
Problem Cause Remedy
The titration will not
be finished. The minimum dosing rate
is too low. Select the user-defined titration rate and
increase the minimum rate (see manual/help of
the software used).
The stop criterion is unsuit-
able. Adjust the control parameters (see manual/
help of the software used):
￭ Increase the stop drift.
￭ Select a short delay time.
The sample is over-
titrated. The control parameters are
unsuitable. Adjust the control parameters (see manual/
help of the software used):
￭ Select Titration rate = slow.
￭ Select the user-defined titration rate and
increase the control range.
￭ Select the user-defined titration rate and
reduce the maximum rate.
￭ Select the user-defined titration rate and
reduce the minimum 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 manual/
help of the software used):
￭ Select Titration rate = optimal or fast.