Title:
LINE PRESSURE MEASUREMENT USING DIFFERENTIAL PRESSURE SENSOR
Document Type and Number:
WIPO Patent Application WO2006130425
Kind Code:
A8
Abstract:
A pressure sensor assembly (56) for sensing a pressure of a process fluid includes a sensor body (220) having a cavity (132,134) formed therein to couple to a process fluid pressure. A deflectable diaphragm (100) in the cavity deflects in response to the first and second process fluid pressures . A first primary electrode (144) couples to a wall (126) of the cavity and forms a first primary capacitor (Mx) between the first primary electrode and the deflectable diaphragm. A first secondary electrode (146) couples to the wall of the cavity to form a first secondary capacitor (Rx) between the first secondary electrode and the deflectable diaphragm. A second primary electrode (148) and second secondary electrode (150) are preferably coupled to a wall (128) of the cavity opposite the first. Line pressure of the process fluid is determined based upon variation in the secondary capacitors relative to the primary capacitors .
Inventors:
HARASYN DONALD E (US)
WILLCOX CHARLES R (US)
WILLCOX CHARLES R (US)
Application Number:
PCT/US2006/020254
Publication Date:
April 26, 2007
Filing Date:
May 25, 2006
Export Citation:
Assignee:
ROSEMOUNT INC (US)
HARASYN DONALD E (US)
WILLCOX CHARLES R (US)
HARASYN DONALD E (US)
WILLCOX CHARLES R (US)
International Classes:
G01L9/00; G01L9/12
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