Metrohm 785 DMP Titrino - Manual (Page 33)

2.6. Parameters, key <PARAM>
785 DMP Titrino
30
Control parameters
The control parameters can be set separately for each end point. Optimize your control
parameters for routine analyses for samples with a rather low content.
During the titration, reagent dosing occurs in 3 phases:
1. Initial dosing:
Here the dosing rate
increases constantly. The rate
starts with "min.rate" and
goes up to "max.rate".
2. Continuous dosing:
Dosing is performed at the
maximum rate "max.rate" until
the control range (dynamics)
is reached.
3. Control range (dynamics):
In this range, dosing is
performed in single steps.
The last dosing steps are
controlled by the parameter
"min.rate".
Trial settings for the size of the control range
Set a large control range for steep curves. Relatively flat curves, on the other hand, need
a smaller control range. You can get an initial, good approximation for the start of the
control range from the intersection point of the tangents:
"steep curves" "flat curves"
U/mV
V/ml
t/s
EP
V/ml
Initial
dosing
Continuous
dosing
Control
range
U/mV
V/ml
EP
Control
range
U/mV
V/ml
EP Control
range