Siemens SITRANS P - Manual (Page 190)

SITRANS P measuring instruments for pressure
Fittings
Technical description
2/190 Siemens FI 01 · 2009
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Overview
All 21-off fittings can be secured onto walls, racks (72 mm grid)
and vertical and horizontal pipes.
This offers the advantage when assembling a plant that the shut-
off fittings can be secured first and the lines for the medium and
differential pressure connected to them. It is then possible to
check all connections for leaks and to blow out or flush the pipes
in order to remove dirt (welding residues, shavings etc.).
The measuring instruments can be screwed onto the shut-off fit-
tings right at the end when all piping has been completed.
If an instrument has to be removed for maintenance, the fittings
and pipes remain as they are. It is only necessary to close the
valves – the instrument can then be removed, and refitted follow-
ing maintenance.
Classification according to pressure equipment directive
(DGRL 97/23/EC):
For gases of fluid group 1 and liquids of fluid group 1; compli-
ance with requirements of article 3, paragraph 3 (sound engi-
neering practice).Siemens FI 01 · 2009
New standard DIN EN 61518
The flange connection between transmitter and valve manifold
was modified in the new standard DIN EN 61518. The only con-
nection thread approved for use in the process flanges of the
pressure transmitter is
7
/
16
-20 UNF.
The valve manifolds for M12 screws, including the accessory
sets, have therefore been deleted.
Material acceptance test certificate to EN 10204-3.1
If a material acceptance test certificate to EN 10204-3.1 is re-
quired when ordering valve manifolds or shut-off fittings, please
note that a single certificate is sufficient for each ordered item
type. This means that you will only be charged for one certificate
in the cost calculations.
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Pressure transmitters with shut-off fittings - mounting examples
SITRANS P transmitter for gage pressure with double shut-off valve,
SITRANS P pressure transmitter with multiway cock or 3-spindle valve
manifold
SITRANS P transmitter for differential pressure with 3-way valve manifold,
3-spindle valve manifold or valve manifold combination DN 5/DN 8
SITRANS P pressure transmitter for differential pressure, mounted in pro-
tective box (available on request)
SITRANS P pressure transmitter mounted on valve combination
"Monoflange" for direct connection to flanges (available on request)
© Siemens AG 2008