Vortex flowmeter with measured parameter adjustment
AssigneeRosemount Inc.
InventorLowell A. Kleven
Life of this patent
Estimating the term…
Abstract
A method and apparatus measures a parameter of a flowing fluid at a first location. A correction is applied to the parameter value that yields an adjusted value representative of the parameter of the fluid at a second location. A flowmeter output is calculated as a function of the adjusted value.
Claims15
A flowmeter that provides a flowmeter output indicative of a mass flow rate of a fluid as a function of a measured fluid temperature or a measured fluid pressure, the flowmeter comprising:
- a flowtube;
- a first sensor disposed in the flowtube having a volumetric output that varies as a function of a volumetric flow rate of the fluid;
- a second sensor positioned at a first location in the flowtube to measure a parameter of the fluid at the first location;
- a circuit receiving a parameter value from the second sensor and the volumetric output from the first sensor, the circuit providing the flowmeter output as a function of the parameter value and the volumetric output;
- and
- wherein the circuit is further configured to apply a correction to the parameter value and to yield an adjusted value representative of the parameter of the fluid at a second location, the adjusted value being used by the circuit to calculate the flowmeter output.
A flowmeter that provides a flowmeter output indicative of a mass flow rate of a fluid as a function of a measured fluid temperature and a measured fluid pressure, the flowmeter comprising:
- a flowtube;
- a volumetric flow sensor disposed in the flowtube, the volumetric flow sensor having a volumetric output that varies as a function of a volumetric flow rate of the fluid;
- a temperature sensor positioned at a first temperature location in the flowtube to measure a temperature of the fluid at the first temperature location;
- a pressure sensor positioned at a first pressure location in the flowtube to measure a pressure of the fluid at the first pressure location;
- a circuit receiving a temperature value from the temperature sensor and a pressure value from the pressure sensor and providing the flowmeter output as a function of the temperature value and the pressure value;
- and
- wherein the circuit is further configured
- to apply a correction to the temperature value and to yield an adjusted temperature value representative of a temperature of the fluid at a second temperature location, and
- to apply a correction to the pressure value thereby yielding an adjusted pressure value representative of a pressure of the fluid at a second pressure location, and
- wherein the adjusted temperature value and the adjusted pressure value being used by the circuit to calculate the flowmeter output.
A method of measuring a flow rate of a fluid, comprising:
- detecting volumetric flow of the fluid and providing a volumetric output;
- measuring a parameter of the fluid at a first location and providing a parameter value indicative of the measured parameter;
- applying a correction to the parameter value thereby yielding an adjusted value representative of the parameter of the fluid at a second location;
- and
- calculating a flowmeter output as a function of the adjusted value.
A method of measuring a flow rate of a fluid, comprising:
- detecting volumetric flow and providing a volumetric output;
- measuring a temperature of the fluid at a first temperature location and providing a temperature value indicative of the temperature of the fluid;
- measuring a pressure of the fluid at a first pressure location and providing a pressure value indicative of the pressure of the fluid;
- applying a first correction to the temperature value to yield an adjusted temperature value representative of the temperature of the fluid at a second temperature location;
- applying a second correction to the pressure value to yield an adjusted pressure value representative of the pressure of the fluid at a second pressure location;
- and
- calculating a flowmeter output as a function of the adjusted temperature value and the adjusted pressure value.
A flowmeter that provides a flowmeter output indicative of a mass flow rate of a fluid, the flowmeter comprising:
- a flowtube;
- a first sensor disposed in the flowtube having a volumetric output that varies as a function of a volumetric flow rate of the fluid;
- a second sensor positioned at a first location in the flowtube to measure a parameter of the fluid at the first location;
- a circuit for receiving a parameter value from the second sensor and providing the flowmeter output as a function of the parameter value, and including means for applying a correction to the parameter value to yield an adjusted value representative of the parameter of the fluid at a second location, the adjusted value being used by the circuit to calculate the flowmeter output.
A method of operating a flowmeter that measures a flow rate of a fluid, comprising:
- measuring a parameter of the fluid at a first location;
- and
- applying a correction to the parameter value thereby yielding an adjusted value representative of the parameter of the fluid at a second location;
- and
- calculating a flowmeter output as a function of the adjusted value.
Dependencies are inferred from the claim text.