Siemens SITRANS P - Manual (Page 176)

SITRANS P measuring instruments for pressure
Clamp-on seals of flange design
For gage pressure, differential pressure and flow
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Overview
Clamp-on seals for flange-mounting
The clamp-on seal is completely integrated in the process line.
It is particularly suitable for flowing and highly viscous media.
The clamp-on remote seal consists of a cylindrical jacket into
which a thin-walled pipe is welded. It is clamped directly be-
tween two flanges in the pipeline.
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Design
• Clamp-on seals for flange-mounting (flange design) to
EN/ASME for SITRANS P pressure transmitters
- For pressure: P300, DS III, DS III PA and DS III FF series
- For differential pressure and flow: DS III, DS III PA and
DS III FF
• Sealing face to EN 1092-1 or ASME B16.5
• Connection to the transmitter directly or by means of a flexible
capillary (max. 10 m long)
• See Technical data for details of materials used for the wetted
parts
• Material used for the capillary, the guard sleeve, the seal’s
main body and the measuring cell: Stainless steel,
mat.-No. 1.4571
• Filling liquid: Silicone oil, high-temperature oil, halocarbon oil,
food oil (FDA listed) or glycerin/water (not suitable for uses in
low-pressure range)
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Function
The measured pressure is transferred from the diaphragm to the
filling liquid and passes either directly or through the capillary to
the measuring chamber of the pressure transmitter. The interior
of the diaphragm seal and of the capillary, as well as the mea-
suring chamber of the pressure transmitter, are filled gas-free by
the filling liquid.
Note:
When operating in the low-pressure range, also during commis-
sioning, it is recommended to use a vacuum-proof remote seal
(see Selection and Ordering data).
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Technical specifications
Clamp-on seals for flange-mounting
Nominal diameter Nominal pressure
• DN 25 PN 6 ... PN 100
• DN 40 PN 6 ... PN 100
• DN 50 PN 6 ... PN 100
• DN 80 PN 6 ... PN 100
• DN 100 PN 6 ... PN 100
• 1 inch Class 150 ... class 2500
• 1½ inch Class 150 ... class 2500
• 2 inch Class 150 ... class 2500
• 3 inch Class 150 ... class 2500
• 4 inch Class 150 ... class 2500
Process connection Flange to EN 1092-1 or
ASME B 16.5
Sealing face To EN 1092-1, form B1 or to
ASME B16.5 RF 125 ... 250 A or
RFSF
Materials
• Main body Stainless steel 1.4404/316L
• Diaphragm Stainless steel 1.4404/316L
• Wetted parts Stainless steel 1.4404/316L
• Without foil
• ECTFE coating
• PFA coating (for vacuum on re-
quest)
Monel 400, mat. No. 2.4360
Hastelloy C276, mat. No. 2.4819
Hastelloy C4, mat. No. 2.4610
Tantalum
• Capillary Stainless steel, mat.
No. 1.4571/316Ti
• Sheath Spiral hose made of stainless
steel, mat. No. 1.4301/316
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 Silicone oil M5
Silicone oil M50
High-temperature oil
Halocarbon oil
Food oil (FDA listed)
Glycerin/water (not suitable for
uses in low-pressure range)
Permissible ambient temperature See pressure transmitters, see fill-
ing liquid
Weight Approx. 4 kg (8.82 lb)
Certificates and approvals
Classification according to pressure
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