VEGA VEGAPULS 41 4 … 20 mA; HART compact sensor - Manual (Page 20)

20 VEGAPULS 41 – 4 … 20 mA
26620-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 baffles
effectively prevent a direct reception false
echoes. These false echoes are scattered
and diffused in the surrounding space are
then filtered out as "echo noise“ by the meas-
uring electronics.
Struts
Correct Incorrect
Shields
2.4 False echoes
The installation location of the radar sensor
must be at a spot 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. Shields above these flat protru-
sions 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