Siemens SITRANS P - Manual (Page 179)

SITRANS P measuring instruments for pressure
Quick-release clamp-on seals
For pressure and absolute pressure
2/179 Siemens FI 01 · 2009
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Overview
Quick-release clamp-on seals, to DIN 11851 with threaded socket
Quick-release clamp-on seals, with clamp connection
Quick-release clamp-on seals for pressure are available for the
following SITRANS P pressure transmitter series:
• P300
• DS III
• DS III PA
• DS III FF
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Application
The quick-release clamp-on seal is a special design for flowing
media and high-viscosity media. Since it is completely inte-
grated in the process pipe, no turbulences, dead volumes or
other obstructions to the flow occur. The measured medium
flows unhindered through the clamp-on seal and results in self-
cleaning of the measuring chamber. Furthermore, the clamp-on
seal can be cleaned by a pig.
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Design
The quick-release clamp is available in two versions:
• DIN 11851 with threaded socket
• Clamp connection
The clamp-on seal is connected to the pressure transmitter ei-
ther directly or by way of a capillary.
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Function
The measured pressure is transferred from the diaphragm,
mounted on the inner circumference of the clamp-on seal, to the
filling liquid and then passes through the capillary to the measur-
ing chamber of the pressure transmitter. The interior of the
clamp-on seal and of the capillary, as well as the measuring
chamber of the pressure transmitter, are filled gas-free by the fill-
ing liquid.
Note:
When operating in the low-pressure range, also during commis-
sioning, it is recommended to use a vacuum-proof pressure
transmitter (see Selection and Ordering data).
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Technical specifications
Clamp-on seals of quick-release design for pressure
Connection Nominal
diameter Nominal
pressure
• To DIN 11851 with threaded
socket
DN 25 PN 40
DN 40 PN 40
DN 50 PN 25
DN 65 PN 25
DN 80 PN 25
DN 100 PN 25
• Clamp connection 1½ inch PN 40
2 inch PN 40
2½ inch PN 40
3 inch PN 40
Material
• Main body Stainless steel 1.4404/316L
• Diaphragm Stainless steel 1.4404/316L
Capillary
• Length Max. 10 m (32.8 ft)
• Internal diameter 2 mm (0.079 inch)
• Minimum bending radius 150 mm (5.9 inch)
Filling liquid • Food oil (FDA listed)
• Glycerin/water (not suitable for
use in low-pressure range)
Permissible ambient temperature Dependent on the pressure trans-
mitter and the filling liquid of the
remote seal
More information can be found in
the technical data of the pressure
transmitters and in the section
"Technical data of filling liquid" in
the Technical description to the
remote seals
Weight Approx. 4 kg (approx. 8.82 lb)
Certificate and approvals
Classification according to pres-
sure equipment directive
(DRGL 97/23/EC) For gases of fluid group 1 and liq-
uids of fluid group 1; complies with
the requirements of article 3,
paragraph 1 (appendix 1);
assigned to category III, confor-
mity evaluation module H by the
TÜV Nord
© Siemens AG 2008