Tecfluid LU Series - Manual (Page 5)

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It is not desirable that the product reaches the instrument, because build-up can form on
the transducer, that would affect the measurement.
2.3 Obstacles in the vessel
The transmitter must be installed so that the ultrasonic beam can not find anything on its
path, as this could lead to unwanted echoes and incorrect measures.
In some cases, inclined reflectors can be placed in front of an obstacle, so that the beam
in this region is diverted and the reflected signal do not return to the instrument.
measured value, and the loop current will be 3.6 mA. or 22 mA depending on the
configuration (see section 5.9 in page 19).
Model Dead zone Max. distance (liquids)
LU91 / LU91H 0.3 m 6 m
LU93 / LU93H 0.45 m 12 m
Max. distance (solids)
3.5 m
7 m
LU923 0.45 m 10 m 5 m
LU921 / LU921H 0.3 m 5 m 2,5 m
In order to reduce the dead zone, a reflector can be installed as shown in the figure.