SPAN LINE PRESSURE EFFECT COMPENSATION FOR DIAPHRAGM PRESSURE SENSOR
First Claim
1. A differential pressure sensor for sensing a differential pressure of a process fluid, comprising:
- a sensor body having a sensor cavity formed therein having a cavity profile; and
a diaphragm in the sensor cavity configured to deflect in response to an applied differential pressure, the diaphragm having a diaphragm profile wherein a gap between the cavity profile and the diaphragm profile changes as a function of the differential pressure;
wherein at least one of the cavity profile and diaphragm profile changes as a function of a line pressure to compensate for changes in the gap due to deformation of the sensor body due to the line pressure.
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Abstract
A differential pressure sensor for sensing a differential pressure of a process fluid, includes a sensor body having a sensor cavity formed therein with a cavity profile. A diaphragm in the sensor cavity deflects in response to an applied differential pressure. The diaphragm has a diaphragm profile. A gap formed between the cavity profile and the diaphragm profile changes as a function of the differential pressure. At least one of the cavity profile and diaphragm profile changes as a function of a line pressure to compensate for changes in the gap due to deformation of the sensor body from the line pressure.
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Citations
21 Claims
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1. A differential pressure sensor for sensing a differential pressure of a process fluid, comprising:
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a sensor body having a sensor cavity formed therein having a cavity profile; and a diaphragm in the sensor cavity configured to deflect in response to an applied differential pressure, the diaphragm having a diaphragm profile wherein a gap between the cavity profile and the diaphragm profile changes as a function of the differential pressure; wherein at least one of the cavity profile and diaphragm profile changes as a function of a line pressure to compensate for changes in the gap due to deformation of the sensor body due to the line pressure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method of sensing a differential pressure of a process fluid, comprising:
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applying a first and second process pressure to a sensor body, the sensor body having a sensor cavity formed therein with a cavity profile; placing a diaphragm in the sensor cavity of the sensor body configured to deflect in response to a pressure difference between the first applied pressure and the second applied pressure, the diaphragm having a diaphragm profile which forms a gap between the cavity profile and the diaphragm profile and wherein deflection of the diaphragm causes the gap to change as a function of the pressure difference; compensating for differential pressure measurement inaccuracies due to a line pressure applied to the sensor body by changing at least one of the cavity profile and diaphragm profile as a function of the line pressure; and measuring differential pressure based upon deflection of the diaphragm within the sensor body. - View Dependent Claims (20, 21)
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Specification