Metrohm 899 Coulometer - Manual (Page 87)

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7 Parameters
899 Coulometer
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This parameter defines the control range before the specified endpoint.
Within the control range, the iodine is generated step by step, the genera-
tion is finely controlled. The closer the endpoint, the slower the iodine is
generated until the rate defined under Min. rate is reached. The larger
the control range, the slower the titration. Outside the control range,
iodine is being continuously generated, the rate is defined under Max.
rate.
Input range 0.1 ... 1250.0 mV
Default value 70.0 mV
Selection off
off
The generation of iodine is finely controlled during the entire titration.
Note
Note that the parameter Dynamics is linked with the parameters End-
point at and I(pol). Explanations in this connection can be found in
chapter 10.4 Control parameters and polarization current, page 95.
Max. rate
This parameter can only be edited with Titration rate = user.
Rate at which iodine is generated outside the control range.
Input range 1.5 ... 2241.0 µg/min
Selection max.
Default value max.
Min. rate
This parameter can only be edited with Titration rate = user.
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.
Input range 0.3 ... 999.9 µg/min
Default value 15.0 µg/min
Table 3 Default values of the predefined titration rates for KFC
Titration rate
slow optimal fast
Dynamics 120.0 mV 70.0 mV 30.0 mV