Differential pressure transmitter with intrinsic verification
First Claim
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1. A differential pressure transmitter, comprising:
- a pair of flexible element assemblies each of which is in fluid communication with a respective port, each of said flexible element assemblies characterized by a ratio of a spring rate to effective area,each of said flexible element assemblies comprising;
one or more convolutions, each of said convolutions comprising at least one axial cylindrical section and at least a radial extension extending from said cylindrical section,a flat element end that exhibits a linear deflection in response to a pressure differential applied thereto, andan electrode capacitively coupled to said element end for sensing a deflection thereof in response to said applied pressure,a connector tube containing a fill fluid for hydraulically coupling said flexible element assemblies, andmeans for determining a differential pressure applied to said ports based on the sensed deflections of said element ends of said pair of flexible element assemblies and for compensating for a difference, if any, between the ratios of spring rate to effective area of said flexible element assemblies.
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Abstract
The present invention provides a dual sensor differential pressure transmitter with a single fill fluid volume that intrinsically eliminates process and environmental performance influences, increases signal level while substantially reducing product costs.
13 Citations
17 Claims
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1. A differential pressure transmitter, comprising:
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a pair of flexible element assemblies each of which is in fluid communication with a respective port, each of said flexible element assemblies characterized by a ratio of a spring rate to effective area, each of said flexible element assemblies comprising; one or more convolutions, each of said convolutions comprising at least one axial cylindrical section and at least a radial extension extending from said cylindrical section, a flat element end that exhibits a linear deflection in response to a pressure differential applied thereto, and an electrode capacitively coupled to said element end for sensing a deflection thereof in response to said applied pressure, a connector tube containing a fill fluid for hydraulically coupling said flexible element assemblies, and means for determining a differential pressure applied to said ports based on the sensed deflections of said element ends of said pair of flexible element assemblies and for compensating for a difference, if any, between the ratios of spring rate to effective area of said flexible element assemblies. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A differential pressure transmitter, comprising:
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a pair of flexible element assemblies each of which is in fluid communication with a respective port, each of said flexible element assemblies characterized by a ratio of a spring rate to effective area, a connector tube containing a fill fluid for hydraulically coupling said flexible element assemblies, and an electronic module for determining a differential pressure applied to said ports and for compensating for a difference, if any, between the ratios of spring rate to effective area of said flexible element assemblies. - View Dependent Claims (15, 16)
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17. A differential pressure transmitter, comprising:
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a body, first and second cavities formed within said body, said first and second cavities being connected, respectively, to first and second ports, first and second flexible element assemblies disposed within said first and second cavities, each of said flexible element assemblies characterized by a ratio of a spring rate to effective area responsive to an applied pressure differential, each of said flexible element assemblies comprising; one or more convolutions, each of said convolutions comprising at least one axial cylindrical section and at least a radial extension extending from said cylindrical section, a flat element end that exhibits a linear deflection in response to a pressure differential applied thereto, and an electrode capacitively coupled to said flat element end for sensing a deflection thereof in response to said applied pressure, a connector tube containing a fill fluid for hydraulically coupling said flexible element assemblies, and an electronic module external to said body for determining a differential pressure applied to said ports based on the sensed deflections of said element ends of said pair of flexible element assemblies and for compensating for a difference, if any, between the ratios of spring rate to effective area of said flexible element assemblies.
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Specification