METHOD FOR OPERATING A RESONANCE MEASURING SYSTEM
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Abstract
A method for operating a Coriolis mass flowmeter in which a simple and reliable detection of a multi-phase flow is implemented by determining at least one first measured value for at least one state variable that is dependent on the amplitude in a multi-phase medium, exciting the measuring tube with the oscillation generator to oscillate at a predetermined oscillation frequency and a first amplitude, and to oscillate with the excitation frequency and a second amplitude, detecting the resulting oscillation of the measuring tube and determining at least a second measured value for the state variable that is dependent on the amplitude in a multi-phase medium from the determined resulting oscillation, and using the deviation of at least one of the first measured value from at least a corresponding second value as an indicator for the presence of a multi-phase flow.
9 Citations
23 Claims
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1-11. -11. (canceled)
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12. Method for operating a resonance measuring system having at least one measuring tube with a medium flowing through it, at least one oscillation generator, at least one oscillation sensor, and at least one control and evaluation unit, comprising the steps of:
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exciting the measuring tube by the oscillation generator to oscillation with a predetermined excitation frequency and a first amplitude, detecting the resulting oscillation of the measuring tube with at least one oscillation sensor, using the control and evaluation unit to determine at least one first measured value (xi) for at least one state variable (x) that is dependent on the amplitude in a multi-phase medium, exciting the measuring tube by the oscillation generator to oscillation with the excitation frequency and a second amplitude which differs from the first amplitude, detecting the resulting oscillation of the measuring tube with the second amplitude and using the control and evaluation unit to determine at least a second measured value (xj) for the at least one state variable (x) that is dependent on the amplitude in a multi-phase medium from the determined resulting oscillation, and using a deviation (Δ
xij) of at least one of the first measured value (xi) from at least one of the corresponding second values (xj) as an indicator for the presence of a multi-phase flow. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. Resonance measuring system, comprising:
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at least one measuring tube with a medium flowing through it, at least one oscillation generator, at least one oscillation sensor, and at least one control and evaluation unit, wherein the oscillation generator is adapted for exciting the measuring tube to oscillation with a predetermined excitation frequency and a first amplitude, and for exciting the measuring tube to oscillation with said predetermined excitation frequency and a second amplitude which differs from the first amplitude, wherein the at least one oscillation sensor is adapted for detecting oscillation of the measuring tube, wherein the control and evaluation unit adapted for determining at least one first measured value (xi) for at least one state variable (x) that is dependent on the amplitude in a multi-phase medium, for determining at least a second measured value (xj) for the at least one state variable (x) that is dependent on the amplitude in a multi-phase medium from the determined detected oscillations, and for using a deviation (Δ
xij) of at least one of the first measured value (xi) from at least one of the corresponding second values (xj) as an indicator for the presence of a multi-phase flow. - View Dependent Claims (23)
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Specification