Electronic vibration sensor

An electronic vibration and sensor technology, applied in instruments, flow characteristics, scientific instruments, etc., can solve the problem of no longer being able to ensure accurate density measurement, and achieve the effect of increasing speed

Active Publication Date: 2021-07-09
EHNDRESS KHAUZER GMBKH KO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The fundamental limitation arises from the empirical assumption that the measurement of a definite, predeterminable phase shift is viscosity-independent
After a certain viscosity, the described measuring principle is no longer able to ensure an accurate measurement of the density

Method used

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Embodiment Construction

[0051] figure 1 An electronic vibration sensor 1 is shown comprising a mechanically oscillatable unit 4 in the form of an oscillating fork extending partly into a medium 2 located in a container 3 . The oscillatable unit is excited by an exciter / receiver unit 5, eg a piezoelectric stack or a bimorph driver, to perform mechanical oscillations. However, it should be understood that other embodiments of the electronic vibration sensor are also within the scope of the present invention. An electronic unit 6 is also provided, via which signal recording, evaluation and / or feedback takes place.

[0052] figure 2 A mechanically oscillatable unit 4 in the form of an oscillating fork is shown, such as integrated into, for example, an electronic vibration sensor sold by the applicant under the LIQUIPHANT trademark. The mechanically oscillatable unit 4 in the form of an oscillating fork comprises two oscillating tines 7 a and 7 b connected to a membrane 8 . In order for the oscillati...

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Abstract

The invention relates to a method for determining and / or monitoring the density (ρ) and / or viscosity (η) of a medium (3) in a container (2) by means of an electronic vibration sensor (1) and to a corresponding sensor (1) ). By electrical excitation signal (U E ) excites the oscillatable unit (4) to perform mechanical oscillation, and receives the mechanical oscillation of the mechanically oscillatable unit (4) and converts it into an electrical reception signal (U R ). In addition, the excitation signal (U E ) from the received signal (U R ) is generated such that the excitation signal (U E ) and the received signal (U R ) there is at least one predeterminable phase shift (), where the excitation signal (U E ) of the frequency (f) according to the received signal (U at a predeterminable phase shift ( ) R )definite. Furthermore, the damping (D) and / or the damping (D) dependent variable is based on the received signal (U at a predeterminable phase shift ( ) R ) determined at least from the damping (D) and / or damping (D)-dependent variables and from the excitation signal (U E ) frequency (f) can determine the density (ρ) and / or viscosity (η) of the medium.

Description

technical field [0001] The invention relates to a method for determining and / or monitoring the density and / or viscosity of a medium in a container by means of an electronic vibration sensor and to a device suitable for carrying out the method. Background technique [0002] Electronic vibration sensors are used extensively in process and / or automation technology. In a fill level measuring device, the device comprises at least one mechanically oscillatable unit, eg an oscillating fork, a single tooth or a membrane. It is excited during operation by a drive / receiver unit, usually in the form of an electromechanical transducer unit, to perform mechanical oscillations. The drive / receive unit can be, for example, a piezoelectric drive or an electromagnetic drive. In a flow measuring device, however, the mechanically oscillatable unit can also be embodied as an oscillatable tube, for example in a measuring device operating according to the Coriolis principle, through which the me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01F23/296G01N11/16
CPCG01F23/2967G01N9/002G01N11/16G01N2009/006
Inventor 托比亚斯·布伦加藤纳曼纽尔·绍特迈斯特萨沙·德安杰利科
Owner EHNDRESS KHAUZER GMBKH KO KG
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