Method for measuring fluid flow
AssigneeRosemount Inc.
InventorsLowell A. Kleven, Robert C. Hedtke, David E. Wiklund
Life of this patent
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Abstract
A method for measuring fluid flow includes generating vortices in a fluid and relating the fluid flow to a first set of fluid parameters to obtain a first relationship, and relating the fluid flow to a second set of fluid parameters to obtain a second relationship. The first and second sets of fluid parameters are monitored. A first flow value is calculated from the first set of monitor fluid parameters and the first relationship. The second relationship is adjusted based on the first flow value. The output value is calculated from the second set of monitored fluid parameters and the adjusted second relationship.
Claims26
A method for calculating an output value representative of a flow rate of a fluid, comprising:
- generating vortices in the fluid;
- relating the fluid flow to a first set of fluid parameters to obtain a first relationship;
- relating the fluid flow to a second set of fluid parameters to obtain a second relationship;
- monitoring the first and second sets of fluid parameters;
- calculating a first flow value from the first set of monitored fluid parameters and the first relationship;
- adjusting the second relationship based on the first flow value;
- and
- calculating the output value from the second set of monitored fluid parameters and the adjusted second relationship.
A method for calculating an output value representative of a mass flow rate of a fluid, comprising:
- generating vortices in the fluid and measuring at least one characteristic of the vortices and measuring a temperature of the fluid;
- calculating a first flow value from the temperature measurement;
- calculating a second flow value from the measured characteristic of the vortices;
- calculating a calibration factor as a function of the first flow value and the second flow value;
- and
- calculating an output mass flow rate as a function of the calibration factor and the measured characteristic of the vortices.
A method for calculating an output value representative of a mass flow rate of a fluid, comprising:
- generating vortices in the fluid;
- detecting at least one characteristic of the vortices;
- calculating a flow value from the characteristic of the vortices;
- calculating a calibration factor as a function of at least one of a pressure of the fluid, a temperature of the fluid, and the flow value;
- and
- calculating an output mass flow rate as a function of the calibration factor and the flow value.
A method for calculating an output value representative of a mass flow rate of a fluid, comprising:
- repeatedly generating vortices in the fluid;
- repeatedly detecting at least one characteristic of the vortices;
- repeatedly calculating a flow value from the characteristic of the vortices;
- repeatedly calculating a calibration factor as a function of at least one of a pressure of the fluid, a temperature of the fluid, and the flow value;
- and
- repeatedly calculating an output mass flow rate as a function of the calibration factor and the flow value and at a rate faster than repeatedly calculating the calibration factor.
Dependencies are inferred from the claim text.