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Device for determining and/or monitoring a process variable of a medium

A process variable and medium technology, applied in the direction of mass flow measurement device, measurement device, measurement flow/mass flow, etc., can solve the problem of not providing additional information of the medium

Active Publication Date: 2008-12-17
EHNDRESS KHAUZER GMBKH KO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Apart from this, this additional measurement does not provide any additional information about the medium

Method used

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  • Device for determining and/or monitoring a process variable of a medium
  • Device for determining and/or monitoring a process variable of a medium
  • Device for determining and/or monitoring a process variable of a medium

Examples

Experimental program
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Embodiment Construction

[0025] figure 1 is a schematic diagram of the apparatus of the present invention. The sensor unit 1, the feedback electronics 2 and the auxiliary electronics 3 added according to the invention are shown. These three units 1 , 2 , 3 together form a first oscillatory circuit 10 , which depends on the process medium interacting with the sensor unit 1 at two resonant frequencies ω res (this frequency is in the band) or ω 1 (in case the oscillation is interrupted because the sensor unit can no longer oscillate mechanically) one of the oscillations. The sensor unit 1 and the auxiliary electronics 3 are in this embodiment connected in parallel and in series with the feedback electronics 2, so that the feedback electronics 2 and the auxiliary electronics 3 are connected in the event of a cable failure (in the figure represented by two interruption lines). indicated) formed with a resonant frequency ω Kabelbruch 20 of the second oscillation.

[0026] For the following consideratio...

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Abstract

The invention relates to a device for determining and / or monitoring at least one process variable of a medium, comprising a sensor unit (1), feedback electronics (2) and auxiliary electronics (3). The sensor unit (1), the feedback electronics (2) and the auxiliary electronics (3) form a first oscillating circuit (10) with at least one resonant frequency (ω1) and / or at a resonant frequency in at least one resonant frequency range (ωres) oscillation. The feedback electronics (2) and the auxiliary electronics (3) form a second oscillating circuit (20) which oscillates at a resonance frequency (ωKabelbruch) different from the resonance frequency (ωres, ω1) of the first oscillating circuit (10).

Description

technical field [0001] The invention relates to a device for determining and / or monitoring at least one process variable of a medium. Process variables are, for example, the level, density, viscosity or flow rate of the medium. The medium can be a liquid or a bulk material. Background technique [0002] The assignee manufactures and sells flow measuring instruments under the trademarks LIQUIPHANT and SOLIPHANT. The filling level is determined using a sensor unit with a mechanically oscillatable unit, eg an oscillating fork, which is excited to oscillate by means of a piezoelectric transducer. For example the amplitude or frequency of the excitation depends on whether the oscillatable unit is free to oscillate, or whether it is covered by a medium. From this dependency it is possible, for example, to determine the flow. [0003] Piezoelectric transducers are also used to receive mechanical oscillations, which are then converted into alternating voltages. This alternating...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01F23/296G01F1/84G01K13/02G01N9/00G09F23/00
CPCG01F1/8436G01F23/2966G01F23/2967G01K13/02G01N9/002G01N2291/02836
Inventor 沃尔夫冈·布鲁钦萨沙·德安热利科
Owner EHNDRESS KHAUZER GMBKH KO KG