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Flow measurement with diagnostics

  • US 6,654,697 B1
  • Filed: 08/27/1999
  • Issued: 11/25/2003
  • Est. Priority Date: 03/28/1996
  • Status: Expired due to Term
First Claim
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1. A pressure transmitter adapted to couple to a primary flow element via impulse lines to sense flow, the pressure transmitter comprising:

  • a differential pressure sensor adapted to couple to the impulse lines to sense a pressure;

    an analog to digital converter coupled to the pressure sensor and generating a series of digital representations of the pressure;

    a microprocessor system receiving the series of digital representations of pressure and having a first algorithm stored therein to calculate a difference between the series of digital representations and a moving average of the series of digital representations, and having a second algorithm stored therein to receive the difference and calculate a trained data set of historical data during a training mode and calculating a current data set during a monitoring mode and generating diagnostic data as a function of the current data set relative to the historical data indicating changes in the condition of flow sensing;

    a digital to analog converter coupled to the microprocessor system generating an analog transmitter output indicative of flow; and

    a digital communication circuit receiving the diagnostic data from the microprocessor system and generating a transmitter output indicating the diagnostic data.

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