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Vibronic sensor

A technology of container and oscillating rod, which is applied in instruments, flow characteristics, scientific instruments, etc., to simplify processing and increase the accuracy of measurement

Active Publication Date: 2017-08-29
EHNDRESS KHAUZER GMBKH KO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, the disadvantage of using a rectangular signal is that, in addition to the excitation frequency, harmonics are transmitted to the oscillatable unit

Method used

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Examples

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Embodiment Construction

[0033] figure 1 A vibration sensor 1 is shown. The oscillatable unit 4 in the form of an oscillating fork extends partially into the medium 2 located in the container 3 . Since this variant of the oscillatable unit is used most frequently, the following description generally refers to, but is not limited to, oscillating forks.

[0034] The mechanical oscillation is performed by exciting the oscillating fork by an electromechanical transducer unit 5 supplied with an excitation signal. For example, the electromechanical transducer unit 5 can be piezoelectric stack or bimorph driven. However, it should be understood that other embodiments of the vibration sensor are within the scope of the present invention. Furthermore, an electronic unit 6 is shown, via which the signal evaluation and / or supply of the excitation signal takes place.

[0035] Figure 2a An oscillating fork is shown schematically, such as for a LIQUIPHANT field device. Shown is a membrane 7 with an oscillato...

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PUM

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Abstract

Apparatus for determining and / or monitoring at least one process variable of a medium (2) in a container (3) with at least one vibratable unit (4), comprising at least one diaphragm (7) and at least one vibrating element (8), with a drive / receiving unit (5) which is configured to excite the mechanically vibratable unit (4) using an electrical excitation signal of an adjustable excitation frequency to vibrate in the vibration mode corresponding to the excitation frequency and to receive the mechanical vibrations from the vibratable unit (4) and to convert said vibrations into an electrical reception signal, and with an electronic unit (6) which is configured to generate the excitation signal on the basis of the reception signal and to determine the at least one process variable from the reception signal, wherein the diaphragm (7) is connected to the drive / receiving unit (5), wherein the vibrating element (8) has the form of a vibrating rod (9) onto which a paddle (10) is formed at the end, and which vibrating element (8) is fastened to the diaphragm (7) in the end region facing away from the paddle (10), and wherein the mass distribution, stiffness and / or geometry of the vibratable unit (4) are selected in such a manner that at least one vibration mode of the vibratable unit (4), which is higher than the vibration mode corresponding to the excitation frequency, is in the range between two adjacent integer multiples of the excitation frequency.

Description

technical field [0001] The invention relates to a device and a method for monitoring at least one process variable of a medium with at least one oscillatable unit having a membrane and an oscillating element. Background technique [0002] These devices, which are also called vibration sensors, are used as fill-level measuring devices and generally have an oscillatory fork as oscillatable unit. However, variants with a single rod or membrane are known. During operation the oscillatable unit is excited by the electromechanical transducer unit to perform mechanical oscillations. The electromechanical transducer unit can be piezoelectrically or electromagnetically driven, for example. [0003] Of course, other options than the above examples are available and also fall within the scope of the present invention. [0004] Applicant sells corresponding field devices in many different forms. In the case of fill level measuring devices, for example, such devices are sold under th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F23/296G01N11/16G01N29/02G01N29/07G01N29/22G01N29/46
CPCG01F23/2967G01F23/2968G01N11/16G01N29/022G01N29/07G01N29/222G01N29/46G01N2291/015G01N2291/014G01N2291/02818G01N2291/0427G01N2009/006G01N9/002
Inventor 拉斐尔·屈南伊拉·亨克尔彼得·文贝格
Owner EHNDRESS KHAUZER GMBKH KO KG