Coriolis Mass Flowmeter and Method for Operating a Coriolis Mass Flowmeter
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Abstract
A method and Coriolis mass flowmeter, wherein the Coriolis mass flowmeter includes at least one measurement tube through which a medium flows, at least one exciter system arranged in the central region of the at least one measurement tube which causes the measurement tube to oscillate, and at least two oscillation pick-ups arranged in front of and behind the at least one exciter system. The at least two measurement tubes are additionally each provided with at least one acceleration sensor arranged in front and/or behind the exciter system. An evaluation device is configured to receive acceleration signals from the acceleration sensors and evaluate the acceleration signals to diagnose an asymmetry in the measurement tubes such that fault states, such as deposits in one of the two measurement tubes, blockage of a tube in a flow divider or asymmetrical changes in the ability of the measurement tubes to oscillate, such as due to cracks or fractures, can advantageously be detected.
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Citations
20 Claims
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1-9. -9. (canceled)
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10. A Coriolis mass flowmeter comprising:
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at least one measuring tube through which a medium flows; at least one excitation system arranged in a middle region of the at least one measuring tube and configured to induce vibration of the at least one measuring tube; at least two vibration pickups arranged upstream and downstream of the at least one excitation system in a longitudinal direction of the at least one measuring tube; and an evaluation device configured to activate the at least one excitation system, receive vibration signals from the at least two vibration pickups and evaluate the at least two vibration pickups to determine a measured value for a mass flow; wherein the at least two measuring tubes are additionally respectively provided with at least one acceleration sensor arranged at least one of upstream and downstream of the at least one excitation system in the longitudinal direction of the at least one measuring tube; and wherein the evaluation device is further configured to receive acceleration signals from the acceleration sensors and evaluate the received acceleration signals for diagnosis of an asymmetry of the at least two measuring tubes. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method for operating a Coriolis mass flowmeter, the method comprising the steps of:
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flowing a medium through at least one measuring tube; inducing vibrations in the at least one measuring tube with at least one excitation system arranged in a middle region of the at least one measuring tube, at least two vibration pickups being arranged upstream and downstream of the at least one excitation system in a longitudinal direction of the at least one measuring tube; activating, by an evaluation device, the at least one excitation system and receiving vibration signals from the at least two vibration pickups and evaluating the received vibration signals to determine a measured value for a mass flow; receiving, by the evaluation device, acceleration signals from acceleration sensors, arranged at least one of upstream and downstream of the at least one excitation system in the longitudinal direction of the at least one measuring tube, and evaluating, by the evaluation device, the acceleration signals for diagnosis of an asymmetry of the measuring tubes.
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Specification