Vega VEGADIF 65 Operating Instructions Manual - page 5
3
P
lanning instructions for isolating systems
3
.
1
I
n
fl
uence of the components
T
he following properties of the separating diaphragm determine the
application area of the isolating diaphragm
:
l
D
iameter
l
R
esilience
l
M
aterial
T
he bigger the diaphragm diameter
,
the higher the resilience and the
lesser the temperature in
fl
uence on the measuring result
.
N
ote
:
T
o
keep the temperature in
fl
uence in reasonable limits
,
you should use an
isolating diaphragm with a nominal width
≥
DN
80
.
T
he resilience also depends on the diaphragm strength
,
the material
as well as a possible coating
.
I
n the selection of
fi
lling oil
,
product and ambient temperature as well
as process pressure are of utmost importance
.
A
lso take note of
temperatures and pressures during setup and cleaning
.
A
nother criteria is the compatibility of the
fi
lling oil to the requirements
of the medium
.
I
n the food processing industry
,
e
.
g
.,
only
fi
lling oils that
are harmless to health are permitted
,
such as e
.
g
.
med
.
white oil
.
S
ee
overview of
fi
lling oils in the following chart
.
F
illing oil
P
ermissible
product temper
-
atures
P
ermissible
product temper
-
atures at
0
.
05
bar
abs
p
1
bar
abs
D
ensi
-
ty in g
/
cm
³
V
is
-
cosity
in m
2
/
s
•
10
-
6
E
xpan
-
sion co
-
e
ffi
cient
1
/
K
C
or
-
rective
factor
for
TK
A
pplication
area
S
ilicone oil
KN
17
-
40
…
+
180
°
C
(-
40
…
+
356
°
F
)
-
40
…
+
80
°
C
(-
40
…
+
176
°
F
)
0
.
96
up to
25
°
C
55
up to
25
°
C
0
.
00104
1
S
tandard
silicone oil
KN
2
.
2
-
40
…
+
200
°
C
(-
40
…
+
392
°
F
)
-
40
…
+
150
°
C
(-
40
…
+
302
°
F
)
0
.
96
up to
20
°
C
55
up to
20
°
C
0
.
00104
1
S
tandard
H
igh tempera
-
ture oil
KN
3
.
1
-
10
…
+
300
°
C
(-
14
…
+
572
°
F
)
-
10
…
+
200
°
C
(
+
14
…
+
392
°
F
)
1
.
07
up to
20
°
C
39
up to
20
°
C
0
.
0008
0
.
77
high temper
-
atures
H
igh tempera
-
ture oil
KN
3
.
2
-
10
…
+
400
°
C
(
+
14
…
+
752
°
F
)
-
10
…
+
200
°
C
(
+
14
…
+
392
°
F
)
1
.
07
up to
20
°
C
39
up to
20
°
C
0
.
0008
0
.
77
high temper
-
atures
H
alocarbon oil
KN
21
(
BAM
tested
)
-
40
…
+
150
°
C
(-
40
…
+
302
°
F
)
-
40
…
+
80
°
C
(-
40
…
+
176
°
F
)
1
.
968
up to
20
°
C
14
up to
20
°
C
0
.
00086
0
.
83
F
or oxygen
and chlorine
applications
S
eparating diaphragm
I
solating diaphragm
fi
ll
-
ing oil
I
solating diaphragm
CSS
•
for
VEGADIF
65
5
3
P
lanning instructions for isolating systems
36134
-
EN
-
090604