Pressure transmitter with fill tube
AssigneeRosemount Inc.
InventorsDavid Matthew Strei, Kenneth Guttsen
Life of this patent
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Abstract
A pressure transmitter has a pressure sensor, an isolator diaphragm, and a fill tube. Interior passages in the pressure sensor module body are filled with isolator fluid and provide fluid connections. The isolator fluid couples pressure from the first isolator diaphragm assembly to the pressure sensor. A first crimp portion of the fill tube radially narrows into a substantially solid circular cylindrical cross section to form a first primary seal that is resistant to high pressure cycling.
Claims17
A method of filling a pressure sensor module of a process pressure transmitter with isolator fluid, comprising:
- providing a pressure sensor module body with interior passages that extend to a process pressure sensor, to an isolator diaphragm assembly that is couplable to a process fluid, and to a fill tube;
- filling the interior passages through the fill tube with the isolator fluid;
- and
- applying a radial compressive force to a crimp portion of the fill tube, the radial compressive force compressing the crimp portion into a substantially solid circular cylindrical cross section such that the isolator fluid is sealed in the interior passages by the crimp portion.
A process pressure transmitter, comprising:
- a pressure sensor module body, a pressure sensor, a first isolator diaphragm assembly that is couplable to a first process pressure, and a first fill tube;
- first interior passages in the pressure sensor module body that connect the pressure sensor, the first isolator diaphragm assembly and the first fill tube to one another;
- a first isolator fluid in the first interior passages, the first isolator fluid coupling pressure from the first isolator diaphragm assembly to the pressure sensor;
- and
- a first crimp portion of the fill tube that radially narrows into a substantially solid circular cylindrical cross section to form a first primary seal.
A process pressure transmitter, comprising:
- a pressure sensor module body, a differential pressure sensor, a first isolator diaphragm assembly that is couplable to a first process pressure, and a first fill tube;
- first interior passages in the pressure sensor module body that connect the differential pressure sensor, the first isolator diaphragm assembly and the first fill tube to one another;
- a first isolator fluid in the first interior passages, the first isolator fluid coupling pressure from the first isolator diaphragm assembly to the differential pressure sensor;
- and
- a first crimp portion of the fill tube that radially narrows into a substantially solid circular cylindrical cross section to form a first primary seal.
Dependencies are inferred from the claim text.