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•
During filing, mixing and other processes, foam can arise
on the surface level of the measured liquid. The foam
absorbs the ultrasonic signal which may cause malfunction
of the level meter (Fig. 9). For such cases, it is necessary to
set up "SENSITIVITY" mode to "high" or to contact the
manufacturer. In case of a thin layer of foam, it is also
recommended to use the directional horn for improving
receipt of the echo.
•
Scattering or attenuation of the
ultrasonic signal can result if the
surface level has been moderate-
ly stirred or rippled (by a mixer,
coming liquid etc.). It can result
in reduction of the measurement
range or unreliable function of the
level meter (Fig. 10).
Rotating mixer blades can cause
•
that the surface is stirred, which re-
sults in false reflections of the ultra-
sonic signal from the surface level
and unreliable operation of the
level meter (Fig. 13).(obr. 11). For a
rippled or swirling level, you can
use the directional horn to elimi-
nate scattering of the ultrasonic
signal.
•
If the level sensor is mounted to
bottlenecks and places with ba-
rriers, or near uneven walls or the
fi ling area, where the transmissi-
on signal could be distorted, we
recommend using a guide tube
(acoustic horn). The tube must be
made from a single material with a
smooth inner surface (see image
12a, 12b ). The minimum tube dia-
meter must have the dimension "b"
according to image 4 on page 5.
After installing, you must perform
the procedure "LEARNING". We
recommend consulting with the
manufacture on the construction of
the guide tube.
7
Fig. 10: Moderately stirred
Fig. 11: Intensely stirred surface
surface
sleeves for
mounting
Obr. 12a: Short guide tube
installation
!
Fig. 9: Foam on the surface
!
ventilation
holes
Obr. 12b: Total guide tube
installation
UltraPro 1000
© Levelpro, s.r.o.
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