Process pressure transmitter with seal having diamond like carbon coating
AssigneeRosemount Inc.
InventorsZhang Xiaoang, Vincent Cline
Life of this patent
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Abstract
A process pressure transmitter system includes a process pressure transmitter housing, a process pressure sensor in the process pressure transmitter housing, a flange face in the process pressure transmitter housing and an isolation diaphragm on the flange face. A first capillary passageway carries a first fill fluid from the isolation diaphragm to the process pressure sensor. A process seal diaphragm couples to a process fluid of the industrial process. A second capillary passageway carries a second fill fluid from the process seal diaphragm to the isolation diaphragm. A diamond like carbon (DLC) coating coats the process seal diaphragm.
Claims14
A process pressure transmitter system, comprising:
- a process pressure transmitter housing;
- a process pressure sensor in the process pressure transmitter housing;
- a flange face in the process pressure transmitter housing;
- an isolation diaphragm on the flange face;
- a first capillary passageway which carries a first fill fluid from the isolation diaphragm to the process pressure sensor;
- a process seal diaphragm configured to couple to a process fluid of the industrial process;
- a second capillary passageway which carries a second fill fluid from the process seal diaphragm to the isolation diaphragm;
- a diamond like carbon (DLC) coating applied to an interior surface of the diaphragm which coats the process seal diaphragm;
- and
- an intermediary layer between the diamond like carbon coating and the process seal diaphragm which provides a transition layer having a coefficient of thermal expansion which is between a coefficient of thermal expansion of the diamond like carbon coating and a coefficient of thermal expansion of the process seal diaphragm.
A remote seal for coupling a process pressure transmitter to a process fluid, comprising:
- a process seal diaphragm configured to couple to the process fluid of an industrial process;
- a capillary passageway which carries a fill fluid from the process seal diaphragm to a distal end to thereby couple a pressure of the process fluid to a pressure sensor of the pressure transmitter;
- a diamond like carbon (DLC) coating applied to an interior surface of the diaphragm which coats the process seal diaphragm;
- and
- an intermediary layer between the diamond like carbon coating and the process seal diaphragm which provides a transition layer having a coefficient of thermal expansion which is between a coefficient of thermal expansion of the diamond like carbon coating and a coefficient of thermal expansion of the process seal diaphragm.
Dependencies are inferred from the claim text.