3
.
2
P
rinciple of operation
VEGACAP
66
is a level sensor with fully insulated capacitive
electrode for level detection
.
VEGACAP
66
is very rugged and maintenance
-
free and can
be used in all areas of industrial process technology
.
F
ully insulated probes such as
VEGACAP
66
are used in
solids as well as in liquids
.
T
ypical applications are over
fi
ll and dry run protection
.
T
he capacitive measuring principle places no special require
-
ments on installation
.
H
ence
,
many di
ff
erent applications can
be equipped with
VEGACAP
66
.
P
roblem
-
free use in adhesive or corrosive products
.
T
he probe
,
the measured product and the vessel wall form an
electrical capacitor
.
T
he capacitance is in
fl
uenced by three
main factors
:
1
2
3
F
ig
.
2
:
F
unctional principle
-
P
late capacitor
1
D
istance between the electrode surfaces
2
S
ize of the electrode surfaces
3
T
ype of dielectric between the electrodes
T
he probe and the vessel wall are the capacitor plates
.
T
he
measured product is the dielectric
.
D
ue to the higher dielectric
constant
(
DK
value
)
of the product compared to air
,
the
capacitance increases as the material gradually covers the
probe
.
T
he capacitance change is converted by the oscillator into a
switching command
.
A
rea of application
P
hysical principle
8
VEGACAP
66
-
with relay output
P
roduct description
30020
-
EN
-
050920
