Pressure-based diagnostic system for process transmitter
First Claim
1. A process transmitter for measuring a process variable, the process transmitter comprising:
- a gauge pressure sensor for measuring a pressure difference between a process fluid and a reference volume, and generating a pressure sensor signal representing the pressure difference;
an excitation source for generating a pressure pulse within the reference volume to influence generation of the pressure sensor signal; and
transmitter circuitry connected to the gauge pressure sensor to provide an output related to a change in the pressure sensor signal due to the pressure pulse.
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Abstract
A process transmitter for measuring a process variable in an industrial process comprises a gauge pressure sensor, an excitation source and transmitter circuitry. The gauge pressure sensor measures a pressure difference between a process fluid and a reference volume, and generates a pressure sensor signal representing the pressure difference. The excitation source generates a pressure pulse within the reference volume to influence generation of the pressure sensor signal. The transmitter circuitry is connected to the gauge pressure sensor to provide an output related to a change in the pressure sensor signal due to the pressure pulse.
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Citations
39 Claims
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1. A process transmitter for measuring a process variable, the process transmitter comprising:
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a gauge pressure sensor for measuring a pressure difference between a process fluid and a reference volume, and generating a pressure sensor signal representing the pressure difference; an excitation source for generating a pressure pulse within the reference volume to influence generation of the pressure sensor signal; and transmitter circuitry connected to the gauge pressure sensor to provide an output related to a change in the pressure sensor signal due to the pressure pulse. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method for diagnosing performance of a gauge pressure sensor in an industrial process transmitter, the method comprising:
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applying an excitation source to a reference volume of the gauge pressure sensor; generating a pressure pulse within the reference volume using the excitation source; transmitting the pressure pulse to a flexible sensor element in the gauge pressure sensor; monitoring a sensor output of the gauge pressure sensor in response to the pressure pulse; and diagnosing performance of the gauge pressure sensor based on the sensor output and the pressure pulse. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
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Specification