Importance

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Abstract

A vibronic sensor for monitoring a process variable of a medium in a containment, comprising a mechanically oscillatable unit, a driving/receiving unit and an electronics unit. The mechanically oscillatable unit has two oscillatory rods and a tuning element of variable stiffness mechanically connected with at least one of the oscillatory rods. At least a first, outer, oscillatory rod is tubular and surrounds a second, inner, oscillatory rod coaxially, wherein each of the two oscillatory rods is secured in such a manner on a shared carrier that each oscillatory rod can execute oscillations transversely to its longitudinal direction. The driving/receiving unit is embodied, based on an electrical excitation signal, to excite the two oscillatory rods in an opposite sense, transverse, mechanical, resonant oscillations, and to receive oscillations of the mechanically oscillatable unit and to convert them into an electrical, received signal, wherein the electronics unit is embodied to tune the stiffness of the tuning element and to ascertain at least from the electrical, received signal, the at least one process variable, and wherein the tuning element includes at least one component of a material, which has a giant delta E effect.

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First Claim