Measuring and testing – Fluid pressure gauge – With pressure and/or temperature compensation
Reexamination Certificate
2009-05-27
2011-10-11
Allen, Andre (Department: 2855)
Measuring and testing
Fluid pressure gauge
With pressure and/or temperature compensation
C073S716000
Reexamination Certificate
active
08033175
ABSTRACT:
A multivariable process fluid pressure transmitter includes an electronics module and a sensor module. The sensor module is coupled to the electronics module. A process fluid temperature sensor is coupled to the process fluid pressure transmitter. A differential pressure sensor is disposed within the sensor module and is operably coupled to a plurality of process fluid pressure inlets. A static pressure sensor is also disposed within the sensor module and is operably coupled to at least one of the process fluid pressure inlets. A first temperature sensor is disposed within the sensor module and is configured to provide an indication of a temperature of the differential pressure sensor. A second temperature sensor is disposed within the sensor module and is configured to provide an indication of a temperature of the static pressure sensor. Measurement circuitry is operably coupled to the differential pressure sensor, the static pressure sensor, and the first and second temperature sensors. A processor is coupled to the measurement circuitry and is configured to provide a compensated differential pressure output based on a measurement of the differential pressure sensor and the first temperature sensor, and to provide a compensated static pressure output based on a measurement of the static pressure sensor and the second temperature sensor.
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International Search Report and Written Opinion for foreign application No. PCT/US2009/045293, dated Sep. 2, 2009.
Fandrey Mark C.
Sundet Paul C.
Allen Andre
Christenson Christopher R.
Rosemount Inc.
Westman Champlin & Kelly P.A.
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