3
.
2
P
rinciple of operation
LBV
331
is a point level sensor with vibrating rod for level detection
.
I
t is designed for industrial use in all areas of process technology and
is preferably used for bulk solids
.
T
ypical applications are over
fi
ll and dry run protection
.
T
hanks to its
simple and robust measuring system
,
LBV
331
is virtually una
ff
ected
by the chemical and physical properties of the bulk solid
.
I
t also works when subjected to strong external vibrations or changing
products
.
S
olid detection in water
I
f
LBV
331
was ordered for solid detection in water
,
the vibrating rod is
calibrated to the density of water
.
I
f covered by water
(
density
:
1
g
/
cm
³
/
0
.
036
lbs
/
in
)
LBV
331
signals
"
uncovered
"
.
O
nly if the vibrating
element is also covered with solids
(
e
.
g
.
sand
,
sludge
,
gravel etc
.)
will
the sensor signal
"
covered
"
.
F
ault monitoring
T
he electronics module of
LBV
331
monitors continuously the
following criteria
:
l
C
orrect vibrating frequency
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 vibrating rod is piezoelectrically energised and vibrates at its
mechanical resonance frequency of approx
.
360
H
z
.
W
hen the
vibrating rod is submerged in the product
,
the vibration amplitude
changes
.
T
his change is detected by the integrated electronics module
and converted into a switching command
.
LBV
331
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
C
on
fi
guration
W
ith the factory setting
,
products with a density of
>
0
.
05
g
/
cm
³
(
0
.
002
lbs
/
in
³
)
can be measured
.
I
t is possible to adapt the instrument
for products with lower density
>
0
.
02
g
/
cm
³
(
0
.
0007
lbs
/
in
³
).
O
n the electronics module you will
fi
nd the following indicating and
adjustment elements
:
l
S
ignal lamp for indication of the switching condition
(
green
/
red
)
A
pplication area
F
unctional principle
V
oltage supply
8
LBV
331
• -
transistor
(
NPN
/
PNP
)
3
P
roduct description
39165
-
EN
-
110621
Summary of Contents for LBV 331
Page 1: ...D F GB S B E T R I E B S A N L E I T U N G LBV 331 Transistor NPN PNP...
Page 34: ...34 LBV 331 Transistor NPN PNP 9 Anhang 39165 DE 110617...
Page 35: ...LBV 331 Transistor NPN PNP 35 9 Anhang 39165 DE 110617...
Page 37: ...GB O P E R AT I N G I N S T R U C T I O N S LBV 331 transistor NPN PNP...
Page 70: ...34 LBV 331 transistor NPN PNP 9 Supplement 39165 EN 110621...
Page 71: ...LBV 331 transistor NPN PNP 35 9 Supplement 39165 EN 110621...
