Diagnostic system for detecting rupture or thinning of diaphragms
First Claim
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1. A diaphragm diagnostic system for use in an industrial field device comprising:
- a diaphragm configured to couple the field device to a process fluid, the diaphragm comprising a plurality of layers, a first layer of the plurality of layers exposed to the process fluid of an industrial process; and
a diagnostic circuit coupled to the diaphragm to monitor an electrical parameter of the diaphragm and responsively infer an operative state of the diaphragm based on a change in the monitored electrical parameter, wherein the electrical parameter is a function of an applied time varying signal.
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Abstract
A diaphragm diagnostic system for use in an industrial field device has a diaphragm and a diagnostic feature. The diaphragm is configured to couple the field device to a process fluid and has a plurality of layers. A first layer of the plurality of layers is exposed to process fluid of an industrial process. A diagnostic feature is coupled to the diaphragm to monitor an electrical parameter of the diaphragm and responsively infer an operative state of the diaphragm based on a change in the monitored electrical parameter.
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Citations
35 Claims
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1. A diaphragm diagnostic system for use in an industrial field device comprising:
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a diaphragm configured to couple the field device to a process fluid, the diaphragm comprising a plurality of layers, a first layer of the plurality of layers exposed to the process fluid of an industrial process; and a diagnostic circuit coupled to the diaphragm to monitor an electrical parameter of the diaphragm and responsively infer an operative state of the diaphragm based on a change in the monitored electrical parameter, wherein the electrical parameter is a function of an applied time varying signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for inferring an operative state of an isolating diaphragm, the method comprising:
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providing an isolating diaphragm comprised of a plurality of layers, a first layer of the plurality of layers exposed directly to a process fluid; applying an electrical signal to the isolating diaphragm; and inferring responsively an operative state of the isolating diaphragm from a measured change in an electrical parameter of the isolating diaphragm relative to the applied electrical signal; and wherein the electrical signal has a time-varying component. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A diaphragm diagnostic system for use in an industrial field device comprising:
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a capacitive element configured to couple the field device to a process fluid, the capacitive element comprised of a plurality of layers, a first layer of the plurality of layers exposed to the process fluid of an industrial process; and a diagnostic circuit coupled to the capacitive element to monitor an electrical parameter of the capacitive element and responsively infer an operative state of the capacitive element based on a change in the monitored electrical parameter. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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Specification