VEGA VEGAPULS 51K…54K Profibus PA - Manual (Page 24)

24 VEGAPULS 51P … 54P
24890-EN-041227
Mounting and installation
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, e.g. 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
Vessel installations
Vessel installations, such as ladders, often
cause false echoes. Make sure when plan-
ning your measurement setup that the radar
signals have unhindered access to the meas-
ured product.
Struts
Struts, like other vessel installations, can
cause strong false echoes that are superim-
posed on the useful echoes. Small baffles
effectively prevent a direct reception of false
echoes. These false echoes are scattered
and diffused in the surrounding space and
are then filtered out as "echo noise“ by the
measuring electronics.
Vessel installations
Correct Incorrect
Ladder
Ladder
Struts
Correct Incorrect
Shields