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 that interfere with
the useful echo
.
M
ake sure when planning your measuring site that the
ultrasonic signals have a
"
clear view
"
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
.
F
ig
.
12
:
A
gitators
V
essel installations
A
gitators
16
VEGASON
61
•
4
…
20
m
A
/
HART
four
-
wire
4
M
ounting
28778
-
EN
-
081127
