SensoTech 3 Component Analysis

3 Component Analysis

Measuring principle
The measuring system LiquiSonic® 40 enables the
concentration measurement in 3-component mixtures.
A 3-component mixture usually means a liquid
of two substances in a carrier fluid or solvent.
The measuring principle is based on the fact that
the concentration changing of individual components
of a liquid have different effects on certain
physical values. For example, these physical values
include sound velocity, density, pH, refractive index,
or other known variables.
If in a carrier liquid, the concentration of two components
changes, two physical values are necessary
to determine the concentration.
If the relationship between changing in concentration
and changing of physical values is unambiguous,
the concentration of each single component
can be determined from a known change of the
physical value according to an analytical mathematic
relation description.

Usually the relationship can be graphically illustrated.
The graph below shows an example of sonic
velocity and conductivity at different concentrations
of each component and at a constant temperature:
concentration 1: c1 = 10 % .. 15 %
concentration 2: c2 = 11 % .. 19 %
As a calculation model, these relationships are
stored in the LiquiSonic® controller 40. So from the
relevant physical value the controller calculates and
displays the concentrations of the single components.
Hence, due to the parallel analysis of two
physical values, two concentrations simultaneously
can be determined at a varying temperature.
The process temperature is also recorded and
taken into the calculation model. Therefore, the
concentration values of the components are always
temperature compensated.
Concentration c

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