VEGA VEGASCAN 850 - Manual (Page 51)

VEGASCAN 850 51
<
100 mm
Wrong
Mounting on a vessel with parabolic tank top
Correct
~ 1 /
2
vessel
radius
Wrong
Parabolic effects of rounded or arched
vessel tops
Round or parabolic tank tops act on the sig-
nals like a parabolic mirror. If the sensor is
placed at the focal point of such a parabolic
tank top, the sensor receives amplified false
echoes. The optimum location is generally in
the area of half the vessel radius from the
centre.
2 m 4 m 6 m 8 m
10 m
20 m
30 m
B
A
max. meas.
distance
Distance of the
transducer to the
vessel wall
Curve 1 (liquids)
Curve 2 (solids)
Distance from the sensor to the vessel wall, depend-
ing on the meas. distance (type 54 … 56)
Mounting and installation
1 m 2 m 3 m 4 m 5 m
5 m
10 m
15 m
B
A
max. meas.
distance
Distance of the
transducer to the
vessel wall
Curve 1 (liquids)
Curve 2 (solids)
Distance from the sensor to the vessel wall, depend-
ing on the meas. distance (type 51 … 53)