Startup and operational techniques for a digital flowmeter
First Claim
1. A method for operating a digital flowmeter comprising:
- operating the digital flowmeter in a random sequence mode, where the random sequence mode is characterized by a first drive signal that includes randomly-generated values and that causes a vibration of a flowtube;
operating the digital flowmeter in a positive feedback mode, where the positive feedback mode is characterized by a sensor signal that corresponds to the vibration and that is used as a second drive signal for maintaining the vibration; and
operating the digital flowmeter in a digital synthesis mode, where the digital synthesis mode is characterized by a synthesis of a third drive signal for maintaining the vibration.
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Abstract
Startup and operational techniques for a digital flowmeter are described. The techniques select an optimal mode of operation for the digital flowmeter, depending on a current environment of the flowmeter. For example, during a startup operation of the flowmeter, the mode of operation might include a random sequence mode, in which filtered, random frequencies are applied as a drive signal to a flowtube associated with the digital flowmeter. Once the flowtube reaches a resonant mode of vibration, the digital flowmeter may transition to a positive feedback mode, in which a sensor signal representing a motion of the flowtube is fed back to the flowtube as a drive signal, as part of a feedback loop. Once an oscillation of the flowtube is achieved and analyzed, a digital synthesis mode of operation may be implemented, in which the analyzed sensor signals are used to synthesize the drive signal.
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Citations
21 Claims
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1. A method for operating a digital flowmeter comprising:
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operating the digital flowmeter in a random sequence mode, where the random sequence mode is characterized by a first drive signal that includes randomly-generated values and that causes a vibration of a flowtube; operating the digital flowmeter in a positive feedback mode, where the positive feedback mode is characterized by a sensor signal that corresponds to the vibration and that is used as a second drive signal for maintaining the vibration; and operating the digital flowmeter in a digital synthesis mode, where the digital synthesis mode is characterized by a synthesis of a third drive signal for maintaining the vibration. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification