Differential pressure transmitter with complimentary dual absolute pressure sensors
First Claim
1. A process variable transmitter for measuring a pressure of a process fluid, comprising:
- a process coupling having a first port configured to couple to a first process pressure and a second port configured to couple to a second process pressure;
a differential pressure sensor coupled to the first and second ports having an output related to a differential pressure between the first pressure and the second pressure;
first and second pressure sensors coupled to respective first and second ports having outputs related to the first and second pressures; and
transmitter circuitry configured to provide a transmitter output based upon the output from the differential pressure sensor and further provide enhanced functionality based upon the first and second pressures;
wherein the first and second pressure sensors comprise a brittle material having a cavity formed therein and wherein the outputs from the first and second pressure sensors are related to deformation of the cavity.
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Abstract
A process variable transmitter for measuring a pressure of a process fluid includes a process coupling having a first port configured to couple to a first process pressure and a second port configured to couple to a second process pressure. A differential pressure sensor is coupled to the first and second ports and provides an output related to a differential pressure between the first pressure and the second pressure. First and second pressure sensors couple to the respective first and second ports and provide outputs related to the first and second pressures. Transmitter circuitry is configured to provide a transmitter output based upon the output from the differential pressure sensor and/or the first and/or second pressure sensors. Additional functionality is provided by the transmitter using the sensed first and/or second pressures.
147 Citations
19 Claims
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1. A process variable transmitter for measuring a pressure of a process fluid, comprising:
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a process coupling having a first port configured to couple to a first process pressure and a second port configured to couple to a second process pressure; a differential pressure sensor coupled to the first and second ports having an output related to a differential pressure between the first pressure and the second pressure; first and second pressure sensors coupled to respective first and second ports having outputs related to the first and second pressures; and transmitter circuitry configured to provide a transmitter output based upon the output from the differential pressure sensor and further provide enhanced functionality based upon the first and second pressures; wherein the first and second pressure sensors comprise a brittle material having a cavity formed therein and wherein the outputs from the first and second pressure sensors are related to deformation of the cavity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of measuring a pressure of a process fluid in a process variable transmitter, comprising:
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coupling a first tube to a first process pressure; coupling a second tube to a second process pressure; sensing a differential pressure between the first process pressure and the second process pressure using a differential pressure sensor coupled between the first and second tubes; sensing the first process pressure with a first pressure sensor coupled to the first process pressure through the first tube; sensing a second process pressure with a second pressure sensor coupled to the second process pressure through the second tube; providing a transmitter output related to the differential pressure sensed by the differential pressure sensor; performing enhanced functionality to the process variable transmitter based upon outputs from the first and second pressure sensors; and wherein the first pressure sensor comprises a brittle material having a cavity formed therein and wherein the output from the first pressure sensor is related to deformation of the cavity. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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Specification