A vibronic sensing element, comprising:
- an oscillator having a first measuring tube for guiding a medium;
- an electrodynamic exciter arrangement for exciting the oscillator to bring about bending vibrations of the first measuring tube;
- an inlet-side sensor arrangement for detecting the bending vibrations of the first measuring tube;
- an outlet-side sensor arrangement for detecting the bending vibrations of the at least one first measuring tube;
- and
- a measuring and operating circuit configured to apply an exciter signal to the electrodynamic exciter arrangement, to detect sensor signals of the inlet-side and the outlet-side sensor arrangements, and to determine a density measurement value and/or a mass flow rate measurement value on the basis of the detected sensor signals,
- wherein the electrodynamic exciter arrangement includes a first exciter assembly fastened to the first measuring tube and a second exciter assembly, wherein the first exciter assembly has a center of gravity located in a measuring tube transverse plane, that is perpendicular to the first measuring tube,
- wherein the first measuring tube has a mirror symmetric profile with respect to the measuring tube transverse plane,
- wherein the electrodynamic exciter arrangement further includes a first electrodynamic exciter,
- wherein the electrodynamic exciter arrangement further includes a second electrodynamic exciter and a first compensation mass body,
- wherein the first exciter assembly includes a first component of the first electrodynamic exciter and a first component of the second electrodynamic exciter and the first compensation mass body,
- wherein the second exciter assembly includes a second component of the first electrodynamic exciter and a second component of the second electrodynamic exciter,
- wherein the first electrodynamic exciter is configured to exert a first exciter force on the first measuring tube, wherein the first exciter force acts between the first component and the second component of the first electrodynamic exciter, wherein an effective center of the first exciter force is in the measuring tube transverse plane,
- wherein the second electrodynamic exciter is configured to exert a second exciter force on the first measuring tube, wherein the second exciter force acts between the first component and the second component of the second electrodynamic exciter, wherein an effective center of the second exciter force is outside the measuring tube transverse plane,
- wherein the measuring and operating circuit is configured to apply a first exciter signal, having a frequency corresponding to a present eigenfrequency of a symmetric vibration mode of the oscillator, to the first electrodynamic exciter, and
- wherein the measuring and operating circuit is further configured to apply a second exciter signal, having a frequency corresponding to a present eigenfrequency of an antisymmetric vibration mode of the oscillator, to the second electrodynamic exciter.