Simplified fluid property measurement
First Claim
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1. A system for measuring mass flow of a process fluid in a pipe, the system comprising:
- a differential pressure measurement field device adapted to couple to the pipe, the differential pressure measurement field device having a differential pressure sensor to measure process fluid pressure upstream and downstream from a flow interrupter in the pipe;
a fluid velocity device coupled to the pipe and adapted to sense a velocity of fluid flowing in the pipe; and
fluid flow circuitry adapted to combine information from the differential pressure measurement field device and the fluid velocity device to provide an indication of a fluid flow property.
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Abstract
A process fluid measurement system provides a first measurement relative to process fluid flowing in a pipe. An additional measurement of process fluid flow velocity in the pipe is combined with the first measurement to provide a simplified indication of mass fluid flow and/or density or other fluid parameter. In some embodiments, the first measurement is a differential pressure measurement. Additionally, one embodiment provides a vortex flowmeter having configurable terminations for coupling to a variety of pressure or differential pressure sensors or transmitters for advanced process fluid measurements or calculations.
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Citations
61 Claims
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1. A system for measuring mass flow of a process fluid in a pipe, the system comprising:
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a differential pressure measurement field device adapted to couple to the pipe, the differential pressure measurement field device having a differential pressure sensor to measure process fluid pressure upstream and downstream from a flow interrupter in the pipe; a fluid velocity device coupled to the pipe and adapted to sense a velocity of fluid flowing in the pipe; and fluid flow circuitry adapted to combine information from the differential pressure measurement field device and the fluid velocity device to provide an indication of a fluid flow property. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A system for measuring a property of a process fluid in a pipe, the system comprising:
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a vortex sensing field device adapted to couple to the pipe and to measure a velocity of the fluid flowing in the pipe, the vortex sensing field device having a plurality of configurable terminations; and wherein the vortex sensing field device calculates the property of the fluid based upon fluid velocity and a fluid variable measured through the plurality of configurable terminations. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47)
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48. A field device for sensing mass flow of a process fluid in a pipe, the field device comprising:
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a vortex generator positionable in the pipe to generate vortices in the fluid as the fluid flows; a first pressure sensor disposed upstream from the vortex generator to sense an upstream fluid pressure; a second pressure sensor disposed downstream from the vortex generator, the second pressure sensor providing an indication of vortices and downstream pressure, the second pressure sensor having a plurality of configurable terminations; and wherein the field device calculates differential pressure from the first and second pressure sensor signals, and calculates vortex frequency from the second pressure sensor signal. - View Dependent Claims (49, 50, 51)
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52. A method of measuring flow of a process fluid flowing in a pipe with a field device, the method comprising:
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providing a flow interrupter in the fluid; sensing a differential pressure between upstream and downstream locations from the interrupter, through a configurable interface; measuring fluid velocity; and calculating, in the field device, mass flow of the fluid based upon the differential pressure and the measured velocity.
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53. A method of adjusting a vortex flowmeter having a notch filter, the method comprising:
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obtaining a fluid flow rate measurement using the vortex flowmeter; obtaining a fluid flow measurement using a differential pressure measurement field device; and adjusting the notch filter of the vortex flowmeter such that the vortex-measured rate matches the differential-pressure measured rate.
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54. A method of providing diagnostics relative to a process fluid measurement system, the method comprising:
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generating a first process fluid flow rate output with a vortex flowmeter field device coupled to a pipe containing process fluid, the vortex flowmeter field device having a plurality of configurable terminations; generating a second process fluid flow rate output with a differential pressure flowmeter field device coupled to the pipe; and comparing the first and second outputs and generating a diagnostic output based upon the comparison.
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55. A system for measuring a property of a process fluid in a process fluid container, the system comprising:
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a differential pressure measurement field device coupled to the process fluid container, the differential pressure measurement field device for measuring differential pressure across a flow interrupter in the conduit; means for measuring process fluid velocity coupled to the conduit to sense a velocity of fluid flowing in the conduit, the means for measuring process fluid velocity having a plurality of configurable terminations; and wherein differential pressure and measured velocity are combined to provide an indication of the property.
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56. A field device for sensing a property of a process fluid in a pipe, the field device comprising:
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a vortex generator positionable in the pipe to generate vortices in the fluid as the fluid flows; a vortex sensor disposed to detect the vortices in the fluid; a controller operably coupled to the vortex sensor to calculate fluid flow rate based on detection of vortices in the fluid by the vortex sensor; an analog-to-digital converter having an output coupled to the controller; a plurality of configurable terminations coupled to the controller and to an input of the analog-to-digital converter, the terminations receiving a first input from a fluid sensor to allow the controller to selectively couple the first input to the analog-to-digital converter; and wherein the controller is configured to calculate the process fluid property based upon the fluid flow rate and a fluid variable measured by the fluid sensor through the configurable terminations. - View Dependent Claims (57, 58, 59, 60, 61)
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Specification