Metrohm 751 GPD Titrino User Manual

Page 34

2.6 Parameters, key

751 GPD Titrino

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

V/ml

Initial

dosing

Continuous

dosing

Control

range

U/mV

V/ml

Control
range

U/mV

V/ml

Control
range