×

Flow measurement diagnostics

  • US 8,290,721 B2
  • Filed: 08/14/2006
  • Issued: 10/16/2012
  • Est. Priority Date: 03/28/1996
  • Status: Expired due to Term
First Claim
Patent Images

1. A flow meter for measuring flow of a process fluid, comprising:

  • a sensor configured to provide a sensor output related to flow of the process fluid;

    measurement circuitry configured to determine flow rate of the process fluid based upon the sensor output; and

    diagnostic circuitry configured to receive the sensor output, and determine standard deviation of the sensor output from the sensor and identify a diagnostic condition by performing diagnostics by comparing a nominal relationship to a current relationship, wherein the diagnostic circuitry determines standard deviation during substantially steady state flow conditions,the nominal relationship comprising;

    a relationship between the flow rate of the process fluid and the standard deviation of the sensor output from the sensor during normal operation, andthe current relationship comprising;

    a relationship between a current flow rate of the process fluid and a current standard deviation of the sensor output from the sensor.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×