Pressure transmitter with multiple reference pressure sensors
First Claim
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1. A pressure transmitter comprising:
- a first process fluid pressure inlet adapted to receive a first process fluid pressure;
a second process fluid pressure inlet adapted to receive a second process fluid pressure;
a differential pressure sensor coupled to the first and second process fluid pressures;
a first pressure sensor coupled to the first process fluid pressure;
a second pressure sensor coupled to the second process fluid pressure; and
circuitry operably coupled to the first and second pressure sensors, and coupled to the differential pressure sensor, the circuitry configured to measure the first and second process pressures as well as the differential pressure and provide an indication relative to the measurements over a process communication loop.
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Abstract
Reliability and accuracy in a pressure measurement transmitter are provided by employing a plurality of absolute or gauge pressure sensors operating in conjunction with a differential pressure sensor. A method is also provided to perform diagnostics based upon the readings of the three pressure sensors. Further, should one of the three pressure sensors fail, a reasonable estimate of process pressure being measured by the failed sensor can be generated based upon the remaining two sensors.
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Citations
23 Claims
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1. A pressure transmitter comprising:
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a first process fluid pressure inlet adapted to receive a first process fluid pressure; a second process fluid pressure inlet adapted to receive a second process fluid pressure; a differential pressure sensor coupled to the first and second process fluid pressures; a first pressure sensor coupled to the first process fluid pressure; a second pressure sensor coupled to the second process fluid pressure; and circuitry operably coupled to the first and second pressure sensors, and coupled to the differential pressure sensor, the circuitry configured to measure the first and second process pressures as well as the differential pressure and provide an indication relative to the measurements over a process communication loop. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of operating a pressure transmitter having a first process fluid inlet configured to receive a first process fluid pressure and a second process fluid inlet configured to receive a second process fluid pressure, the method comprising;
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measuring the first process fluid pressure with a first pressure sensor of the transmitter; measuring the second process fluid pressure with a second pressure sensor of the transmitter; measuring a differential pressure of the first and second process fluid pressures with a differential pressure sensor of the transmitter; and determining whether the measured differential pressure is similar to a difference between the measured first and second fluid pressures. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A method of operating a pressure transmitter having a first process fluid inlet configured to receive a first process fluid pressure and a second process fluid inlet configured to receive a second process fluid pressure, the method comprising;
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measuring the first process fluid pressure with a first pressure sensor of the transmitter and determining if the first measured process fluid pressure is valid; measuring the second process fluid pressure with a second pressure sensor of the transmitter and determining if the second measured process fluid pressure is valid; measuring a differential pressure between the first and second process fluid pressures, and determining if the differential pressure is valid; and providing an estimate of a process fluid pressure in the event of an invalid sensor signal as a function of at least two other valid sensor signals. - View Dependent Claims (20, 21, 22)
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23. A pressure transmitter comprising:
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a first process fluid pressure inlet adapted to receive a first process fluid pressure; a second process fluid pressure inlet adapted to receive a second process fluid pressure; a differential pressure sensor coupled to the first and second process fluid pressures; a first pressure sensor coupled to the first process fluid pressure; a second pressure sensor coupled to the second process fluid pressure; and circuitry operably coupled to each of the first pressure sensor, the second pressure sensor, and the differential pressure sensor, wherein the circuitry is configured to make independent measurements from each of at least three sensors comprising the first pressure sensor, the second pressure sensor, and the differential pressure sensor, and to provide an indication relative to the measurements over a process communication loop.
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Specification