Metrohm 799 GPT Titrino - Manual (Page 35)

2.6 Parameters, key
799 GPT Titrino
31
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