Metrohm 899 Coulometer - Manual (Page 88)

7.1 Coulometric Karl Fischer titrations (KFC)
￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
78 ￭￭￭￭￭￭￭￭
899 Coulometer
Titration rate
slow optimal fast
Max. rate 1000.0 µg/min maximum maximum
Min. rate 0.3 µg/min 15.0 µg/min 30.0 µg/min
Stop criterion
The titration is canceled when the endpoint has been reached and this
stop criterion has been fulfilled. If no stop criterion has been selected then
the titration will not be canceled. The stop conditions (see Chapter 7.1.5,
page 81) always lead to a stop, even if the stop criterion has not been
reached.
Selection drift | time | rel. drift | off
Default value rel. drift
drift
The titration is canceled when the stop drift has been reached.
time
The titration is canceled if the endpoint has been exceeded during a
certain time period (Delay time).
rel. drift
The titration is canceled when the sum of the drift at the start of the
titration and the relative stop drift has been reached.
off
The titration will not be canceled until the stop conditions have been
fulfilled.
Stop drift
This parameter can only be edited with Stop criterion = drift.
The titration is canceled when the endpoint and the stop drift have been
reached.
Input range 1 ... 999 µg/min
Default value 5 µg/min
Delay time
This parameter can only be edited with Stop criterion = time.
The titration will be canceled if the following criteria are both met simulta-
neously.
￭ The voltage at the indicator electrode lies in the range "endpoint +5
mV and endpoint –2 mV".
￭ The time defined here has expired.