~200
~
400x400
45˚
F
ig
.
10
:
B
eam de
fl
ector
T
he ultrasonic sensor should be installed at a location where
no installations cross the ultrasonic beam
.
V
essel installations such as for example
,
ladders
,
limit
switches
,
heating spirals
,
struts etc
.
can cause false echoes
superimposed on the useful echo
.
M
ake sure when planning
your measuring site that the ultrasonic signals have
"
free
access
"
to the measured product
.
I
n case of existing vessel installations
,
a false echo storage
should be carried out during setup
.
I
f large vessel installations such as struts or supports cause
false echoes
,
these can be attenuated through supplementary
measures
.
S
mall
,
inclined sheet metal or plastic ba
ffl
es above
the installations scatter the ultrasonic signals and avoid direct
false echoes
.
α
α
α
α
α
α
F
ig
.
11
:
C
over smooth pro
fi
les with de
fl
ectors
I
f there are agitators in the vessel
,
a false echo storage should
be carried out with the agitators in motion
.
T
his ensures that
the interfering re
fl
ections from the agitators are saved with the
blades in di
ff
erent positions
.
V
essel installations
A
gitators
18
VEGASON
63
-
4
...
20
m
A
/
HART
M
ounting
28777
-
EN
-
070507
