Endress+hauserse+co. Kg

Endress + Hauser Gmbh + Co. Kg

Ira Henkel

Robert Schmidt

Raphael Kuhnen

Dietmar Frühauf

Alexander Müller

Armin Rupp

Peter Wimberger

The present disclosure includes an electromechanical transducer unit for a field device of automation technology including a membrane having a base area and displaceable to execute mechanical oscillations, three rods secured to the membrane perpendicular to the base area, a housing, wherein the rods extend into the housing, three magnets, each secured to one of the rods opposite the membrane, and a coil having a core and secured within the housing adjacent the magnets, the coil embodied to produce a magnetic field that causes the rods to execute mechanical oscillations. The rods are secured to the membrane such that oscillations of the membrane result from the oscillations of the rods. At least one of the rods is secured to the base area where the second derivative of the deflection of the membrane from a rest position as a function of the site on the base area is essentially zero.

Electromagnetic driving/receiving unit for a field device of automation technology

The present disclosure relates to an apparatus for determining and/or monitoring a process variable of a medium in a containment, including an oscillatable unit with a membrane, three rods secured to the membrane and extending perpendicularly to a base area of the membrane, a housing, wherein the rods extend into the housing a driving/receiving unit disposed at an end region of the rods and configured to excite the oscillatable unit and transduce mechanical oscillations into a received signal, and an electronics unit configured to produce an exciter signal from the received signal and to ascertain the process variable at least from the received signal. At least one of the rods is secured to the membrane at a site on the base area where the second derivative of the deflection of the membrane from a rest position as a function of the site on the base area is essentially zero.

Apparatus for determining and/or monitoring at least one process variable

An apparatus for determining and/or monitoring at least one process variable of a medium in a container, comprising at least an oscillatable unit having at least one membrane, and at least one oscillatory element, a driving/receiving unit embodied to excite the mechanically oscillatable unit by means of an electrical, exciter signal of adjustable excitation frequency to execute oscillations in an oscillation mode corresponding to the excitation frequency and to receive mechanical oscillations from the oscillatable unit and to convert such into an electrical received signal, and an electronics unit embodied, to produce the exciter signal, and to ascertain from the received signal the at least one process variable. The membrane is connected with the driving/receiving unit. The oscillatory element has the shape of an oscillatory rod, on which a paddle is terminally formed, and the oscillatory element is secured on the membrane in an end region remote from the paddle. Mass distribution, stiffness and/or geometry of the oscillatable unit is/are selected in such a manner that at least one of the oscillation modes of the oscillatable unit higher in reference to the oscillation mode corresponding to the excitation frequency lies in the range between two neighboring whole-numbered multiples of the excitation frequency.

Vibronic sensor

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Wehr, Germany

Ira Henkel