Planning Instructions For Isolating Systems; Influence Of The Components - Vega VEGADIF 65 Operating Instructions Manual
Differential pressure transmitter, isolating diaphragm css
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Also See for VEGADIF 65:
- Operating instructions manual (104 pages) ,
- Operating instructions manual (88 pages) ,
- Operating instructions manual (92 pages)
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Separating diaphragm
Isolating diaphragm fill-
ing oil
Filling oil
Permissible
product temper-
atures
Silicone oil
-40 ... +180 °C (-
KN17
40 ... +356 °F)
silicone oil
-40 ... +200 °C (-
KN2.2
40 ... +392 °F)
High tempera-
-10 ... +300 °C (-
ture oil KN 3.1
14 ... +572 °F)
High tempera-
-10 ... +400 °C
ture oil KN 3.2
(+14 ... +752 °F)
Halocarbon oil
-40 ... +150 °C (-
KN21 (BAM
40 ... +302 °F)
tested)
Isolating diaphragm CSS • for VEGADIF 65
3 Planning instructions for isolating systems
3.1 Influence of the components
The following properties of the separating diaphragm determine the
application area of the isolating diaphragm:
Diameter
l
Resilience
l
Material
l
The bigger the diaphragm diameter, the higher the resilience and the
lesser the temperature influence on the measuring result. Note: To
keep the temperature influence in reasonable limits, you should use an
isolating diaphragm with a nominal width ≥ DN 80.
The resilience also depends on the diaphragm strength, the material
as well as a possible coating.
In the selection of filling oil, product and ambient temperature as well
as process pressure are of utmost importance. Also take note of
temperatures and pressures during setup and cleaning.
Another criteria is the compatibility of the filling oil to the requirements
of the medium. In the food processing industry, e.g., only filling oils that
are harmless to health are permitted, such as e.g. med. white oil. See
overview of filling oils in the following chart.
Permissible
Densi-
product temper-
ty in g/
atures at
cm³
0.05 bar
< p
abs
< 1 bar
abs
-40 ... +80 °C (-
0.96
40 ... +176 °F)
up to
25 °C
-40 ... +150 °C (-
0.96
40 ... +302 °F)
up to
20 °C
-10 ... +200 °C
1.07
(+14 ... +392 °F)
up to
20 °C
-10 ... +200 °C
1.07
(+14 ... +392 °F)
up to
20 °C
-40 ... +80 °C (-
1.968
40 ... +176 °F)
up to
20 °C
3 Planning instructions for isolating systems
Vis-
Expan-
cosity
sion co-
2
in m
/
efficient
-6
1/K
s•10
55
0.00104
up to
25 °C
55
0.00104
up to
20 °C
39
0.0008
up to
20 °C
39
0.0008
up to
20 °C
14
0.00086
up to
20 °C
Cor-
Application
rective
area
factor
for TK
1
Standard
1
Standard
0.77
high temper-
atures
0.77
high temper-
atures
0.83
For oxygen
and chlorine
applications
5
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