Deltabar S
46 Endress+Hauser
Filling oil
When selecting the filling oil, fluid and ambient temperature as well as the operating pressure are of crucial
importance. Pay attention to the temperatures and pressures during commissioning and cleaning. A further
selection criterion is the compatibility of the filling oil with the requirements of the process medium. For this
reason, only filling oils that are non-toxic are used in the food industry, such as vegetable oil or silicone oil.
→ See also the following section "Diaphragm seal filling oils".
The filling oil used influences the TK zero point and the temperature operating range of a diaphragm seal system
and the response time. → See also page 47 ff, sections "Influence of the temperature on the zero point
for diaphragm seal systems" and "Response time".
Differential pressure transmitter
The differential pressure transmitter influences the temperature operating range, the T
K
zero point and the
response time as a result of the volume of its side flange and as a result of its volume change. The volume
change is the volume that has to be shifted to pass through the complete measuring range.
Differential pressure transmitters from Endress+Hauser are optimized with regard to minimum volume change
and side flange.
Diaphragm seal filling oils
Filling oil Permissible temperature
range at
0.7 psi p
abs
≤ 14.5 psi p
abs
(0.05 bar p
abs
≤ 1 bar)
Permissible
temperature range at
p
abs
≥ 14.5 psi p
abs
(p
abs
≥ 1 bar)
Density Viscosity Coefficient
of thermal
expansion
T
K
correction
factor
Notes
[g/cm
3
] [cSt at
77°F/25°C]
[1/K]
Silicone oil –40 to +356°F
(–40 to +180°C)
–40 to +482°F
(–40 to +250°C)
0.96 100 0.00096 1 suitable for foods
High-temperature oil +14 to +392°F
(–10 to +200°C)
+14 to +662°F
(–10 to +350°C)
0.81 30 0.0007 0.72 high
temperatures
Inert oil –40 to +176°F
(–40 to +80°C)
–40 to +347°F
(–40 to +175°C)
1.87 27 0.000876 0.91 Oil for ultra pure
gas and oxygen
applications
Vegetable oil,
FDA 21 CFR 172.856
+14 to +248°F
(–10 to +120°C)
+14 to +392°F
(–10 to +200°C)
0.94 9,5 0.00101 1.05 suitable for foods
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