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US 7,954,383 B2Granted
Method and apparatus for pressure measurement using fill tube
AssigneeRosemount Inc.
InventorsCharles R. Willcox, Robert C. Hedtke, Liangju Lu
Life of this patent
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Abstract
A pressure sensor includes a fill tube which is arranged to couple to a process pressure. A sensor is coupled to the fill tube and is configured to measure pressure of fluid in the fill tube as a function of a change of a physical property of the fill tube. Circuitry is provided to measure pressure using the pressure sensor, and to measure pressure based upon the change of the physical property of the fill tube.
Claims31
A pressure sensor, comprising:
- a differential pressure sensor having a first port, a second port and an output related to a differential pressure between the first and second ports;
- a first fill tube arranged to couple the first port to a first process pressure;
- a second fill tube arranged to couple the second port to a second process pressure;
- and
- a fill tube physical property sensor coupled to the first tube configured to measure a pressure of fill fluid in the first tube as a function of a change of a physical property of the first fill tube.
2 more elements
A method for measuring pressures in an industrial process, comprising:
- coupling a first fill tube to the process to measure a first process pressure;
- coupling a second fill tube to the process to measure a second process pressure;
- measuring a differential pressure using a differential pressure sensor coupled to the first and second fill tubes;
- and
- measuring a line pressure of the process fluid based upon a change in a physical property of the first fill tube.
2 more elements
Dependencies are inferred from the claim text.