Metrohm 900 Touch Control Manual - Manual (Page 371)

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29 Parameters
900 Touch Control
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Dynamics
This parameter defines the control range before the specified control
point. Individual volume steps are dosed in the control range, the dosing
is finely controlled. The closer the control point, the slower the dosing
until the dosing rate defined under Min. rate has been reached. The
larger the control range, the slower the titration. Outside the control
range, dosing is carried out continuously, and the dosing rate is defined
under Max. rate.
The values that are actually measurable may vary from the values specified
here, depending on the hardware. The binding measurement value ranges
can be found in the "Technical specifications" chapter for the control
device used.
Measuring mode pH:
Input range
0.001 - 20.000
Default value 1.000
Selection off
Measuring mode U:
Input range
0.1 - 2,000.0 mV
Default value 60.0 mV
Selection off
Max. rate
Rate at which dosing is carried out outside of the control range.
Rule of thumb for the maximum rate in mL/min:
0.005 · expected reaction rate in µL/min
Input range 0.01 - 166.00 mL/min
Default value 0.75 mL/min
Selection maximum
maximum
The maximum dosing rate depends on the cylinder volume (see Chap-
ter 32, page 488).
Min. rate
Rate at which dosing is carried out 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 behavior at the control point. The minimum rate
also has a decisive influence on how exactly the control point can be kept
constant. The smaller the selected minimum rate, the longer it takes until
the control point is reached for the first time.
The following rule of thumb should be considered in order to obtain a
dosing at the control point as constant (regular) as possible: