General Description - Rechner Sensors TRUE Level KFS-1 Série Manuel D'utilisation

General description

Level control systems for analogue measurements
The capacitive measurement systems of the
ment. The system comprises:
l
Filling level probe KFS-1-...
l
Evaluation unit KFA-1-...
Automatic compensation for changes in dielectric constant
The analogue level measurement automatically makes a compensation for the changes in the dielectric
constant of the filling material, which is very advantageous for applications with changing products. For the
DC-compensation (DC = dielectric constant)
ence area is in the tip of the probe.
We use for these analogue level systems our patented three electrode measuring principle. With this
measuring principle the container is part of the measurement. The container must be metal or a metal foil
has to be fixed on the container (foil length > probe length). The resulting large measuring volume is the
series are designed for analogue measure-
ε
a reference measurement is made. For that reason a refer-
r
reason why material depositions on the probe surface
are irrelevant for the measurement.
on the left you see a schematic drawing of the measu-
ring ranges of a filling level probe with two measuring
points. You see, that the probe measures a range that
is like a disc and not just a small area around the pro-
be.
At the tip of the probe there is the reference range,
which measures the measuring conditions at the appli-
cation. This is important for the automatic compensati-
on of changes in the dielectric constant of the material
to be detected.
The reference range of the probe can be placed within
the cone of a container.
For the measuring range the container diameter must
be the same over the whole measuring range. This is
important to guarantee the linearity of the measure-
ment.
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