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Method and apparatus for characterizing process control equipment integrity

  • US 9,000,773 B2
  • Filed: 04/19/2012
  • Issued: 04/07/2015
  • Est. Priority Date: 04/26/2011
  • Status: Active Grant
First Claim
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1. A method implemented at a fault detection and isolation (FDI) system for indicating loss of integrity of a body of a field device, the method comprising:

  • receiving at the FDI system a first series of measurements from the field device;

    storing the first series of measurements;

    receiving at the FDI system a second series of measurements from the field device;

    storing the second series of measurements;

    generating a first curve based on the first series of measurements and a second curve based on the second series of measurements;

    determining a first plurality of coefficients for the first curve and a second plurality of coefficients for the second curve;

    comparing the first plurality of coefficients and the second plurality of coefficients to determine if the first series of measurements deviates from the second series of measurements;

    generating an indication if the first plurality of coefficients deviates from the second plurality of coefficients.

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