4 false echoes, Shoulders, Vessel installations – VEGA VEGAPULS 56V User Manual
Page 40: Struts
40
VEGAPULS 56V
,,,,
,,,,
,,,,
,,,,
,,,,
,,,,
,,,,
,,,,
,,,,
,,,,
,,,,
,,,,
,,,,
,,,,
,,,,
,,,,
,,,,
,,,,
,,,,
,,,,
,,,,
,,,,
,,,,
,,,,
,,,,
,,,,
,,,,
,,,,
,,,,
,,,,
,,,,
,,,,
,,,,
,,,,
,,,,
,,,,
,,,,
,,,,
,,,,
,,,,
Mounting and installation
4.4 False echoes
The installation place of the radar sensor
must be chosen such that no struts or
inflowing material cross the radar signals.
The following examples and instructions
show frequent measuring problems and how
they can be avoided.
Shoulders
Vessel forms with flat shoulders pointing to
the antenna can influence the measurement
due to their hard false echoes. Deflectors
above these flat shoulders diffuse the false
echoes and ensure a reliable measurement.
Inlets, e.g. for material mixing with flat surface
pointing to the radar sensor, should be cov-
ered by a screen. False echoes are hence
gated out.
Flat shoulders
Shoulders (inlets)
Vessel installations
Vessel installations, such as e.g. a ladder
often cause false echoes. Note when plan-
ning a measurement loop that the radar sig-
nals reach the product without problems.
Struts
Struts such as vessel installations can cause
strong false echoes which can overlay the
useful echo. Small screens avoid a direct
false echo reflection. The false echoes are
diffused and filtered out by the measuring
electronics as "echo noise“.
Vessel installations
Struts
Correct
Wrong
Correct
Wrong
Ladder
Ladder
Screens
Correct
Wrong
Correct
Wrong
Screen
Screen