DEVICE FOR DETERMINING AND/OR MONITORING A PROCESS VARIABLE OF A MEDIUM

摘要

The invention relates to a device for determining and/or monitoring at least one process variable of a medium. Said device comprises at least one mechanically vibrating membrane (1) that has a plurality of natural intrinsic modes, and at least one excitation/reception unit (2) which excites the membrane (1) to perform mechanical vibrations and/or receives mechanical vibrations from the membrane (1). According to the invention, the excitation/reception unit (2) and the membrane (1) are designed and adjusted to one another in such a way that the membrane (1) performs only mechanical vibrations which correspond to modes lying above the fundamental mode of the membrane (1).