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4.3.5 Installation Should Avoid False Echo
A minimum distance shall be kept between the probe of ultrasonic level meter and
surface of measured medium, which is normally called the blind area. However, if
the minimum distance cannot be ensured on site in some cases, an extended con-
necting pipe shall be installed on the container.
(1) Devices and installation in the container
During sensor installation, it shall be ensured that the ultrasonic wave beam is not
blocked by other devices or feedstock. The bulges on the plane or stair-like barriers
in the container will have a great impact on the measurement and a deflector can be
provided on the embossment to reflect the false echo so as to ensure accurate mea-
surement.
Stair-like barriers in the
container – inclined deflec-
tor needed to reflect the
false echo
If the upper surface of object at the lower part of the container is a plane, the inlet
for various media must be covered with a deflector set at certain angle.
Flat-top bulge at the bot-
tom of the container –
deflector required