AFRISO SonarFox UST 20, Operating Instructions Manual

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11 AFRISO SonarFox UST 20
Installation in silo or storage reservoir
Fig. 10: Installation in silo or hopper
In case the level of bulk solids is measured,
the measurement range is reduced Due to
absorption of acoustic waves by a bulk me-
dium, shortening of the measuring range
occurs by up to 50 % depending on the grain
size.
We therefore recommend selecting a level
meter with greater range than the maximum
range of measuring the medium. It is also ap-
propriate to use a directional horn, which re-
duces the shortening of the measuring range,
because it better concentrates acoustic energy
while preserving the same beam angle, and
improves the sensitivity when receiving the
reflected echo.
Installation on uneven and wavy surfaces
Fig. 11: Moderately stirred surface
If the surface is slightly uneven or wavy (due
to agitator or filling flow), there may be interfer -
ing reflections.
Fig. 12: Intensely stirred surface
The surface can be whirled up by the rotat-
ing blades of the agitator and this can lead to
interfering reflections.
In the case of uneven surfaces, you must
perform a false signal suppression.
Measuring tunnel