Pressure transmitter with acoustic pressure sensor
First Claim
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1. A transmitter configured to measure a process variable of an industrial process, comprising:
- a pressure sensor structure containing a pressure sensor therein, the pressure sensor configured to couple to a pressure of a process fluid and provide a pressure output related to process pressure, the pressure sensor coupled to process piping through impulse piping whereby the pressure sensor structure is spaced apart from the process piping which carries the process fluid, wherein the propagation speed of an acoustic signal in the process fluid is a function of pressure of the process fluid;
an acoustic detector coupled to the pressure sensor structure configured to receive the acoustic signal propagated through the pressure sensor structure and provide an acoustic output related to propagation speed of the acoustic signal; and
measurement circuitry coupled to the pressure sensor and the acoustic detector configured to generate an output related to pressure of the fluid as a function of the pressure output and propagation speed of the acoustic signal.
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Abstract
A transmitter configured to measure a process variable of an industrial process, includes a pressure sensor configured to couple to a pressure of a fluid. An acoustic detector receives an acoustic signal from the fluid. Measurement circuitry coupled to the pressure sensor and the acoustic detector provides an output related to pressure of the fluid.
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Citations
21 Claims
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1. A transmitter configured to measure a process variable of an industrial process, comprising:
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a pressure sensor structure containing a pressure sensor therein, the pressure sensor configured to couple to a pressure of a process fluid and provide a pressure output related to process pressure, the pressure sensor coupled to process piping through impulse piping whereby the pressure sensor structure is spaced apart from the process piping which carries the process fluid, wherein the propagation speed of an acoustic signal in the process fluid is a function of pressure of the process fluid; an acoustic detector coupled to the pressure sensor structure configured to receive the acoustic signal propagated through the pressure sensor structure and provide an acoustic output related to propagation speed of the acoustic signal; and measurement circuitry coupled to the pressure sensor and the acoustic detector configured to generate an output related to pressure of the fluid as a function of the pressure output and propagation speed of the acoustic signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of measuring a process variable of an industrial process, comprising:
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coupling a pressure sensor structure to a process fluid through impulse piping, the pressure sensor structure carrying a pressure sensor, wherein propagation speed of acoustic signals in the process fluid is a function of pressure of the process fluid; measuring a pressure of the process fluid using the pressure sensor coupled to the process fluid and providing an output related to process pressure; receiving an acoustic signal which has propagated through the pressure sensor structure which has a propagation speed through the process fluid which is a function of pressure of the process fluid; and providing an output related to pressure of the process fluid based upon the propagation speed of the acoustic signal through the process fluid and the process pressure. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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Specification