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I
t is designed for industrial use in all areas of process technology and
can be used in liquids
.
H
igh frequency microwave impulses are guided along a steel cable or
rod or a rod inside a steel tube
.
W
hen reaching the product surface
,
a
part of the microwave impulses is re
fl
ected
.
T
he other part passes the
upper product and is re
fl
ected a second time by the interface
.
T
he
running times to the two product layers are processed by the
instrument
.
U
pper medium
(
L
2
)
l
T
he upper medium must not be conductive
l
T
he dielectric
fi
gure of the upper medium must be known
(
input
required
).
M
in
.
dielectric
fi
gure
:
rod version
1
.
7
;
coax version
1
.
4
.
Y
ou can
fi
nd a list with the dielectric
fi
gures on our home page
:
www
.
vega
.
com
l
T
he composition of the upper medium must be stable
,
no varying
products or mixtures
l
T
he upper medium must be homogeneous
,
no strati
fi
cations within
the medium
l
M
in
.
thickness of the upper medium
100
mm
l
C
lear separation from the lower medium
,
no emulsion phase
,
no
mull layer
l
I
f possible
,
no foam on the surface
L
ower medium
(
L
1
)
l
T
he dielectric
fi
gure must be
10
higher than the dielectric
fi
gure of
the upper medium
,
preferably electrically conductive
.
E
xample
:
upper medium dielectric
fi
gure
2
,
lower medium at least dielectric
fi
gure
12
F
unctional principle
P
rerequisites for inter
-
face measurement
VEGAFLEX
67
•
P
ro
fi
bus
PA
9
3
P
roduct description
32313
-
EN
-
120329