Method of correcting flow meter variable

Patent metadata

Field	Value
Publication number	US-12203791-B2
Application number	US-202017794127-A
Country	US
Kind code	B2
Filing date	Jan 31, 2020
Priority date	Jan 31, 2020
Publication date	Jan 21, 2025
Grant date	Jan 21, 2025

Abstract

A method for correcting a flow variable ( 509 ) based on an inner pressure inside a Coriolis flow meter ( 202 ) comprises the steps of receiving a first outside pressure ( 503 ) measured with a first pressure sensor ( 204 ) located in a first process conduit ( 208 a ) positioned on a first end ( 212 a ) of the Coriolis flow meter ( 202 ), determining a second outside pressure ( 505 ) in a second process conduit ( 208 b ) positioned on a second end ( 212 b ) opposing the first end ( 212 a ) of the Coriolis flow meter ( 202 ), determining an estimated inner flow meter pressure ( 507 ) based on the first outside pressure ( 503 ) and the second outside pressure ( 505 ), receiving the flow variable ( 509 ), and generating a corrected flow variable ( 512 ) based on the estimated inner flow meter pressure ( 507 ), a pressure compensation factor ( 510 ), and the flow variable ( 509 ).

First claim

The invention claimed is:

1. A method for correcting a flow variable ( 509 ) based on an inner pressure inside a Coriolis flow meter ( 202 ), the method comprising:
receiving a first outside pressure ( 503 ) measured with a first pressure sensor ( 204 ) located in a first process conduit ( 208 a ) positioned on a first end ( 212 a ) of the Coriolis flow meter ( 202 );
determining a second outside pressure ( 505 ) in a second process conduit ( 208 b ) positioned on a second end ( 212 b ) opposing the first end ( 212 a ) of the Coriolis flow meter ( 202 );
determining an estimated inner flow meter pressure ( 507 ) based on the first outside pressure ( 503 ) and the second outside pressure ( 505 );
receiving the flow variable ( 509 ); and
generating a corrected flow variable ( 512 ) based on the estimated inner flow meter pressure ( 507 ), a pressure compensation factor ( 510 ), and the flow variable ( 509 ), wherein the pressure compensation factor is correlated to a pressure inside a flow tube of the Coriolis flow meter ( 5 ).

2. A method as claimed in claim 1 , wherein determining the second outside pressure ( 505 ) is based on a pressure loss coefficient, a fluid velocity, a fluid viscosity, and a density.

3. The method as claimed in claim 1 , wherein determining the second outside pressure ( 505 ) further comprises receiving a second outside pressure measurement from a second pressure sensor ( 206 ) located in the second process conduit ( 208 b ).

4. A method as claimed in claim 1 , wherein determining the estimated inner flow meter pressure ( 507 ) based on the first outside pressure ( 503 ) and the second outside pressure ( 505 ) further comprises averaging the first outside pressure ( 503 ) and the second outside pressure ( 505 ).

5. A method as claimed in claim 1 , wherein determining the estimated inner pressure is further based on a cross-sectional area of a process conduit, a diameter of the process conduit, a cross-sectional area of the flow tube of the Coriolis flow meter ( 202 ), a measured density p, and a measured flow rate M.

6. A method as claimed in claim 1 , wherein the flow variable ( 509 ) is at least one of: a mass flow, a volume flow, or a density.

7. A method as claimed in claim 1 , wherein determining the estimated inner flow meter pressure ( 507 ) is further based on a flow meter direction.

8. An electronics for correcting a flow variable ( 509 ) based on an inner pressure inside a Coriolis flow meter ( 202 ), the electronics comprising an interface for receiving a first outside pressure ( 503 ) from a first pressure sensor ( 204 ), and a processing system in communication with the interface, with the processing system configured to:
receive a first outside pressure ( 503 ) measured with a first pressure sensor ( 204 ) located in a first process conduit ( 208 a ) positioned on a first end ( 212 a ) of the Coriolis flow meter ( 202 );
determine a second outside pressure ( 505 ) in a second process conduit ( 208 b ) positioned on a second end ( 212 b ) opposing the first end ( 212 a ) of the Coriolis flow meter ( 202 );
determine an estimated inner flow meter pressure ( 507 ) based on the first outside pressure ( 503 ) and the second outside pressure ( 505 );
receive the flow variable ( 509 ); and
generate a corrected flow variable ( 512 ) based on the estimated inner flow meter pressure ( 507 ), a pressure compensation factor ( 510 ), and the flow variable ( 509 ), wherein the pressure compensation factor is correlated to a pressure inside a flow tube of the Coriolis flow meter.

9. An electronics as claimed in claim 8 , wherein the processing system is further configured to determine the second outside pressure ( 505 ) based on a pressure loss coefficient, a fluid velocity, a fluid viscosity, and a density.

10. An electronics as claimed in claim 8 , wherein the processing system is further configured to determine the second outside pressure ( 505 ) by receiving a second outside pressure measurement from a second pressure sensor ( 206 ) located in the second process conduit ( 208 b ).

11. An electronics as claimed in claim 8 , wherein the processing system is further configured to determine the estimated inner flow meter pressure ( 507 ) based on the first outside pressure ( 503 ) and the second outside pressure ( 505 ) by averaging the first outside pressure ( 503 ) and the second outside pressure ( 505 ).

12. An electronics as claimed in claim 8 , wherein the processing system is further configured to determine the estimated inner pressure based on a cross-sectional area of a process conduit, a diameter of the process conduit, a cross-sectional area of a flow tube of the Coriolis flow meter ( 202 ), a measured density p, and a measured flow rate M.

13. An electronics as claimed in claim 8 , wherein the flow variable ( 509 ) is at least one of: a mass flow, a volume flow, or a density.

14. An electronics as claimed in claim 8 , wherein determining the estimated inner flow meter pressure ( 507 ) is further based on a flow meter direction.

15. A flow meter correction system configured to correct a flow variable ( 509 ) based on an inner pressure inside a Coriolis flow meter ( 202 ), the system comprising:
a first pressure receiving module configured to receive a first outside pressure ( 503 ) from a first pressure sensor ( 204 ) located in a first process conduit ( 208 a ) positioned on a first end ( 212 a ) of the Coriolis flow meter ( 202 );
a second pressure receiving module for determining a second outside pressure ( 505 ) in a second process conduit ( 208 b ) positioned on a second end ( 212 b ) opposing the first end ( 212 a ) of the Coriolis flow meter ( 202 );
an inner flow meter pressure estimation module configured to determine an estimated inner flow meter pressure ( 507 ) based on the first outside pressure ( 503 ) and the second outside pressure ( 505 );
a flow variable receiving module configured to receive a flow variable ( 509 ); and
a flow variable correction module configured to generate a corrected flow variable ( 512 ) based on the estimated inner flow meter pressure ( 507 ), a pressure compensation factor ( 510 ), and the flow variable ( 509 ), wherein the pressure compensation factor is correlated to a pressure inside a flow tube of the Coriolis flow meter ( 202 ).

16. A flow meter correction system as claimed in claim 15 , wherein the second pressure receiving module is further configured to determine the second outside pressure ( 505 ) based on a pressure loss coefficient, a fluid velocity, a fluid viscosity, and a density.

17. A flow meter correction system as claimed in claim 15 , wherein the second pressure receiving module is further configured to receive a second outside pressure measurement from a second pressure sensor ( 206 ) located in the second process conduit ( 208 b ).

18. A flow meter correction system as claimed in claim 15 , wherein the inner flow meter pressure estimation module is further configured to average the first outside pressure ( 503 ) and the second outside pressure ( 505 ).

19. A flow meter correction system as claimed in claim 15 , wherein the inner flow meter pressure estimation module is further configured to determine the estimated inner pressure based on a cross-sectional area of a process conduit, a diameter of the process conduit, a cross-sectional area of a flow tube of the Coriolis flow meter ( 202 ), a measured density p, and a measured flow rate M.

20. A flow meter correction system as claimed

Assignees

• Micro Motion Inc

Inventors

• Buttler Marc Allan

Classifications

• G01F1/845

  arrangements of measuring means, e.g., of measuring conduits · CPC title

• G01F25/10

  of flowmeters · CPC title

• G01F15/02

  Compensating or correcting for variations in pressure, density or temperature · CPC title

• G01F15/024 Primary

  involving digital counting · CPC title

• G01F1/84 Primary

  Coriolis or gyroscopic mass flowmeters · CPC title