Method for generating a diagnostic from a deviation of a flow meter parameter

Patent metadata

Field	Value
Publication number	US-10480977-B2
Application number	US-93656408-A
Country	US
Kind code	B2
Filing date	May 1, 2008
Priority date	May 1, 2008
Publication date	Nov 19, 2019
Grant date	Nov 19, 2019

Abstract

A method for detecting a deviation in a flow meter parameter of a flow meter that is adapted to measure a fluid flow rate is provided. The method comprises measuring a differential pressure across at least a portion of the flow meter. The method further comprises comparing the measured differential pressure to an expected differential pressure; the expected differential pressure being based on the measured flow rate. The method further comprises detecting a deviation in the flow meter parameter if the difference between the measured differential pressure and the expected differential pressure exceeds a threshold limit.

First claim

We claim:

1. A method for detecting a deviation in a flow meter parameter of a Coriolis flow meter, comprising steps of:
measuring a differential pressure across at least a portion of the Coriolis flow meter;
determining an expected differential pressure based on a known fixed fluid viscosity;
measuring a flow rate with the Coriolis flow meter;
comparing the measured differential pressure to the expected differential pressure based on the measured flow rate; and
detecting a deviation in the flow meter parameter if the difference between the measured differential pressure and the expected differential pressure falls outside of a predetermined threshold limit;
wherein the deviation in the flow meter parameter indicates the presence of a coating in the Coriolis flow meter.

2. The method of claim 1 , further comprising a step of measuring a differential pressure across the entire Coriolis flow meter.

3. The method of claim 1 , wherein the expected differential pressure is obtained from a previously prepared plot of differential pressure v. flow rate.

4. The method of claim 1 , further comprising a step of storing the expected differential pressure in a meter electronics.

5. A method for detecting a deviation in a flow meter parameter of a Coriolis flow meter, comprising steps of:
measuring a differential pressure across the Coriolis flow meter;
measuring a fluid flow rate with the Coriolis flow meter;
calculating an expected fluid flow rate based on the measured differential pressure;
comparing the measured fluid flow rate to the calculated fluid flow rate; and
detecting a deviation in the flow meter parameter if the difference between the measured fluid flow rate and the calculated fluid flow rate exceeds a predetermined threshold limits;
wherein the deviation in the flow meter parameter indicates the presence of a coating in the Coriolis flow meter.

6. The method of claim 5 , further comprising a step of determining a flow meter coefficient.

7. The method of claim 5 , further comprising a step of storing the expected fluid flow rate in meter electronics.

Assignees

• Cunningham Timothy J
• Patten Andrew Timothy
• Micro Motion Inc

Inventors

• Cunningham Timothy J
• Patten Andrew Timothy

Classifications

• G01F1/8477 Primary

  with multiple measuring conduits · CPC title

• G01F25/0007

  Physics · mapped topic

• G01F15/022

  using electrical means · CPC title

• G01F1/8409

  constructional details · CPC title

• G01F25/10

  of flowmeters · CPC title