Metrohm 719 S Titrino User Manual

Page 35

2.7 Parameters, key

719 S 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