VEGA VEGAPULS 41 Profibus PA - Manual (Page 22)

22 VEGAPULS 41 – Profibus PA
27292-EN-041227
Vessel installations
Vessel installations such as, e.g. ladders,
often cause false echoes. Make sure when
planning your measuring location that the
radar signals have free access to the meas-
ured product.
Vessel installations
Correct Incorrect
Ladder
Ladder
Struts
Struts, like other vessel installations, can
cause strong false echoes that are superim-
posed on the useful echoes. Small shields
effectively hinder a direct false echo reflec-
tion. These false echoes are scattered and
diffused in the area and are then filtered out
as "echo noise“ by the measuring electronics.
Struts
Correct Incorrect
Shields
2.4 False echoes
The radar sensor must be selected must be
installed at a location where no installations or
inflowing material cross the radar impulses.
The following examples and instructions
show the most frequent 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 a sloping shield
that will scatter false echoes.
Vessel protrusions (ledge)
Vessel protrusions (intake pipe)
Correct Incorrect
Correct Incorrect
Mounting and installation