l
T
echnical data
l
A
rticle numbers
,
documentation
3
.
2
P
rinciple of operation
SITRANS LVL
100
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
,
SITRANS LVL
100
can be
also mounted
,
e
.
g
.
in pipelines from
DN
25
.
T
he small tuning
fork allows use in vessels
,
tanks and pipes
.
T
hanks to its
simple and robust measuring system
,
SITRANS LVL
100
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
SITRANS LVL
100
continuously
monitors via frequency evaluation the following criteria
:
l
S
trong corrosion or damage on the tuning fork
l
loss 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
contactless electronic switch opens
(
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 oscillator and converted into a
switching command
.
SITRANS LVL
100
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
.).
A
rea of application
F
unctional principle
S
upply voltage
8
SITRANS LVL
100
l
CONTACTLESS ELECTRONIC SWITCH
P
roduct description
33843
-
EN
-
080421
