Metrohm 840 PC Control 6.0 / Touch Control - Manual (Page 16)

2.1 Coulometric Karl Fischer titrations (KFC) ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
10 ￭￭￭￭￭￭￭￭
iodine is being continuously generated, the rate is defined under Max.
rate.
Range 0.1 ... 1250.0 mV
Default value 70.0 mV
Selection off
Max. rate
Rate at which iodine is generated outside the control range.
Range 1.5 ... 2241.0 µg/min
Selection maximum
Default value maximum
Min. rate
Rate at which iodine is generated at the very beginning of the titration
and in the control range at the end of the titration. This parameter has a
decisive influence on the titration rate and thus also on the accuracy. The
smaller the selected minimum rate, the slower the titration.
Range 0.3 ... 999.9 µg/min
Default value 15.0 µg/min
Table 1 Default values of the predefined titration rates for KFC
Titration rate
slow optimal fast
Dynamics 120.0 mV 70.0 mV 30.0 mV
Max. rate 1000.0 µg/min maximum maximum
Min. rate 0.3 µg/min 15.0 µg/min 30.0 µg/min
Stop criterion
Stop criterion
The titration is stopped 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 stopped. The stop conditions (see Chapter 2.1.3,
page 12) 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 stopped when the stop drift has been reached.
time
The titration is stopped when the endpoint has been exceeded during
a certain period of time (Delay time).