VEGA VEGAPULS 43 Profibus PA - Manual (Page 23)

VEGAPULS 43 – Profibus PA 23
3.4 False echoes
The radar sensor must be installed at a loca-
tion where no installations or inflowing material
cross the radar impulses. The following ex-
amples and instructions show the most fre-
quent measuring problems and how to avoid
them.
Vessel protrusions
Vessel forms with flat protrusions can make
measurement very difficult due to their strong
false echoes. Baffles mounted above these
flat protrusions scatter the false echoes and
guarantee a reliable measurement.
Intake pipes, i.e. for the mixing of materials -
with a flat surface directed towards the sen-
sor - should be covered with an angled baffle
that scatters false echoes.
Vessel protrusions (ledge)
Vessel protrusions (intake pipe)
Correct Incorrect
Correct Incorrect
Mounting and installation
The standpipe or surge pipe can be
equipped with a quadrant pipe at its end
instead of a deflector. The quadrant pipe
reflects the radar signals that penetrate the
medium diffusely to the side and diminishes
strong echoes from the tube end or the ves-
sel bottom.
0 %
0 %
Quadrant pipe on the bypass tube end
Quadrant pipe on the standpipe end