Patent ID: 8915147

Claim:
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: 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 (x i ) 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 (x j ) 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 (Δx ij ) of at least one of the first measured value (x i ) from at least one of the corresponding second values (x j ) as an indicator for the presence of a multi-phase flow.