Process pressure transmitter with seal having diamond like carbon coating

摘要

A process pressure transmitter system includes a process pressure transmitter housing (14), a process pressure sensor (28) in the process pressure transmitter housing, a flange face (80) in the process pressure transmitter housing and an isolation diaphragm (25) on the flange face (80). A first capillary passageway (82) carries a first fill fluid from the isolation diaphragm to the process pressure sensor (28). A process seal diaphragm (18) couples to a process fluid of the industrial process. A second capillary passageway (22) carries a second fill fluid from the process seal diaphragm to the isolation diaphragm. A diamond like carbon (DLC) coating (90) coats the process seal diaphragm (18).