3
.
2
P
rinciple of operation
VEGASWING
51
is a point level sensor with tuning fork for level
detection
.
I
t is designed for industrial use in all areas of process technology and
can be used in liquids
.
T
ypical applications are over
fi
ll and dry run protection
.
W
ith a tuning
fork of only
40
mm length
,
VEGASWING
51
can be also mounted e
.
g
.
in pipelines from
DN
32
.
T
he small tuning fork allows use in vessels
,
tanks and pipes
.
T
hanks to its simple and robust measuring system
,
VEGASWING
51
is virtually una
ff
ected by the chemical and physical
properties of the liquid
.
I
t functions even under di
ffi
cult conditions such as turbulence
,
air
bubbles
,
foam generation
,
buildup
,
strong external vibration or
changing products
.
F
ault monitoring
T
he electronics module of
VEGASWING
51
continuously monitors via
frequency evaluation the following criteria
:
l
S
trong corrosion or damage on the tuning fork
l
L
oss of vibration
l
L
ine break to the piezo drive
I
f a malfunction is detected or in case of power failure
,
the electronics
takes on a de
fi
ned switching condition
,
i
.
e
.
the output is open
(
safe
condition
).
T
he tuning fork is piezoelectrically energised and vibrates at its
mechanical resonance frequency of approx
.
1200
H
z
.
T
he piezos are
fi
xed mechanically and are hence not subject to temperature shock
limitations
.
T
he frequency changes when the tuning fork is covered by
the medium
.
T
his change is detected by the integrated electronics
module and converted into a switching command
.
VEGASWING
51
is a compact instrument
,
i
.
e
.
it can be operated
without external evaluation system
.
T
he integrated electronics
evaluates the level signal and outputs a switching signal
.
W
ith this
switching signal
,
a connected device can be operated directly
(
e
.
g
.
a
warning system
,
a
PLC
,
a pump etc
.).
T
he data for power supply are speci
fi
ed in chapter
"
T
echnical data
"
.
3
.
3
O
peration
T
he switching status of
VEGASWING
51
can be checked with closed
housing
(
signal lamp
).
P
roducts with a density
>
0
.
7
g
/
cm
³
(
0
.
025
lbs
/
in
³
)
can be detected
.
A
pplication area
F
unctional principle
V
oltage supply
8
VEGASWING
51
• -
transistor
(
PNP
)
3
P
roduct description
30213
-
EN
-
120124
