Patent ID: 9000773
Filing Date: 2015-04-07
Classification: G01N,G05B

Abstract:
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.