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

A technology of process variables and components, used in measuring devices, liquid level indicators for physical variable measurement, lubrication indicating devices, etc., can solve problems such as temperature dependence

Active Publication Date: 2014-09-03
EHNDRESS KHAUZER GMBKH KO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The temperature dependence of the oscillation characteristics results in a temperature dependence of the measurement accuracy of the device

Method used

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  • Device for determining and/or monitoring at least one process variable
  • Device for determining and/or monitoring at least one process variable
  • Device for determining and/or monitoring at least one process variable

Examples

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Embodiment Construction

[0027] figure 1 A device 1 for determining and / or monitoring a predetermined fill level, density or viscosity of a medium 21 in a container 2 is shown. The oscillatable unit 3 is shaped as a fork with two rods or teeth, which are coupled to each other via a membrane and are thus energizable to perform mechanical oscillations. The device 1 is introduced into the container 2 such that the oscillatable unit 3 is positioned at a height corresponding to the fill level to be monitored. Arranged on the rear side of the membrane facing away from the medium 21 is an electromechanical transducer unit 4 which excites the oscillatable unit 3 to perform oscillations and receives mechanical oscillations from the oscillating unit 3 and converts them into electrical receive signal.

[0028] Embodiments of an electromechanical transducer unit 4 with one or more piezoelectric transducer elements 41 , 43 , 44 are known from the prior art. In a piezoelectric device technology, where the transd...

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Abstract

Device for determining and / or monitoring at least one process variable of a medium (21) in a container (22), comprising a mechanically oscillatable unit (3), an electromechanical converter unit (4) which has at least one piezoelectric or inductive converter element (41), causes the oscillatable unit (3) to oscillate mechanically under the effect of an excitation signal (AS), and receives oscillations from the oscillatable unit (3) and converts said oscillations into an electrical receive signal (ES), a reference element (5) having a first component (42) operated using an electrically adjustable variable, wherein said reference element (5) is connected in parallel to the electromechanical converter unit (4), is impinged upon by the same excitation signal (AS), and generates a reference signal (RS) that is not influenced by the oscillations of the oscillatable unit (3), and an electronic unit that extracts a useful signal (NS) from the receive signal (ES) and the reference signal (RS) and uses said useful signal (NS) to determine and / or monitor the process variable. According to the invention, the electromechanical converter unit (4) has a second component (42) operated using an electrically adjustable variable.

Description

technical field [0001] The invention relates to a device for determining and / or monitoring at least one process variable with a mechanically oscillatable unit. Process variables are, for example, the fill level, density or viscosity of the medium in the container. Background technique [0002] Oscillating forks are known in the prior art for monitoring the limit level of liquids in containers or for measuring density or viscosity. The mechanically oscillatable unit in the form of an oscillating fork is excited by an electromotive, especially inductive or piezoelectric transducer unit to perform a resonant mechanical oscillation. There are transducer units with only one piezo unit (eg DE3931453C1) and transducer units with at least one exciter piezo and one receiver piezo (eg DE19720519A1). In the case of inductively working systems, two separate coils are used as transmitter and receiver. In the case of such an inductive drive system, it is disadvantageous that the voltag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F23/296G01N9/00G01N11/16
CPCG01N2011/0013G01F23/22G01N9/002G01N11/16G01F23/2961G01F23/2966
Inventor 马克斯·鲍尔托比亚斯·布伦加藤纳马丁·乌尔班米歇尔·西格尔
Owner EHNDRESS KHAUZER GMBKH KO KG
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