VEGA VEGASON 54K…56K - Manual (Page 24)

24 VEGASON 54K … 56K
At greater distances, the energy of the ultra-
sonic impulses distributes over a large area,
thus causing weaker echoes from obstruct-
ing surfaces. The interfering signals are
therefore less critical than those at close
range.
If possible, orient the sensor axis perpen-
dicularly to the product surface and avoid
vessel installations (e.g. pipes and struts)
within the 100 % area of the emission cone.
The following illustration of the ultrasonic
beams is simplified and represents only the
main beam. In reality, there are quite a
number of ancillary beams.
Min. distance, max. measuring range, span and reference plane
max. meas. distance 25 m (type 54), 45 m (type 55), 70 m (type 56)
4.2 General installation instructions
Measuring range
Beside other criteria, you select your instru-
ment according to the required measuring
range.
The reference planes for the min. and max.
distance to the liquid or solid is the trans-
Mounting and installation
ducer end, or with instruments in flange ver-
sion, the instrument flange (version A).
Please note the information on the reference
planes in chapter "3.2 Dimensions“. The
max. filling depends on the required min.
distance and the mounting location.
Span
min. meas.
distance 1.0 m
min. meas. distance 0.8 m
Reference plane
Beam angle and false echoes
The ultrasonic impulses are focused by the
transducer. The impulses leave the trans-
ducer in conical form similar to the beam
pattern of a spotlight. The beam angle is 4°
(VEGASON 54), 5° (VEGASON 55) and 6°
(VEGASON 56) at -3 dB emitted power.
Any object inside this emission cone will
cause a false echo. Especially within the first
few meters of the emission cone, pipes,
struts, or other installations can interfere with
the measurement. At a distance of 6 m, the
false echo of a strut has an amplitude nine
times greater than at a distance of 18 m.
max. meas. range
0 %
100 %
Span
0 %
100 %
Span
0 %
100 %
min. meas. distance 1.4 m
Reference plane