Siemens SITRANS FC430 Operating Instructions Manual page 34

Description
3.3 Design
Figure 3-3
Sensor design
All primary process measurement of massflow, volumeflow, density and process
temperature are made in the DSL/sensor front end.
The sensor comprises two parallel bent tubes welded directly to the process connections at
each end via a manifold. The sensor is available in an intrinsically safe (IS) design for
hazardous area installations.
The sensors are available in AISI 316L stainless steel and Hastelloy C22. The enclosure is
made of AISI 304 stainless steel which has a pressure rating of 20 bar (290 psi) for DN 15 to
DN 50 and 17 bar (247 psi) for DN 80. The burst pressure for all sizes is in excess of 160
bar.
The sensor enclosure can be equipped with a pressure guard or flushed with dry inert gas at
the threaded ports for non-hazardous applications only.
Note
Ex certification requires that the threaded ports always remain closed.
In the remote configuration, the sensor front end (DSL) is available in an aluminum
enclosure with an ingress protection grade of IP67/NEMA 4X. For communication and power
supply a 4-wire connection can be made via M12 plug and socket or cable gland/conduit
entry for cable termination.
32
Remote version - terminated cable
Operating Instructions, 05/2015, A5E03361511-AF
FC430 with HART