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Measuring assembly for measuring liquids

A measuring device, liquid technology, applied to measuring devices, testing food, instruments, etc., can solve problems such as wrong measurement, and achieve the effect of suppressing induction

Active Publication Date: 2019-12-13
TESTO AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, there are additional disturbance variables which can cause erroneous measurements of the dielectric constant ε of the oil or grease

Method used

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  • Measuring assembly for measuring liquids
  • Measuring assembly for measuring liquids
  • Measuring assembly for measuring liquids

Examples

Experimental program
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Embodiment Construction

[0043] figure 1 Shown is a measuring device designated overall by 1 for the capacitive measurement of frying oil and / or frying fat. For this purpose, frying oil and / or frying fat are fed to the outer electrode 3 of the measuring device 1 by means of the inflow opening 22 and are discharged therefrom by means of the outflow opening 23 , so that a flow-through measurement takes place.

[0044] Such as figure 2 As shown, the external electrode 3 is formed by a cylindrical base body. The inner electrode 2 is arranged at a distance from the outer electrode 3 , the longitudinal axis of which coincides with the longitudinal axis of the outer electrode 3 . The outer electrode 3 therefore surrounds the inner electrode 2 concentrically. A cylindrical measuring gap 9 is formed between the inner electrode 2 and the outer electrode 3 . Frying oil and / or frying fat flow through the measuring gap 9 in the radial direction and in the axial direction (in each case with respect to the long...

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Abstract

The aim of the invention is to increase the measuring precision of an electric measuring assembly (1) for capacitively measuring a liquid, comprising an inner electrode (2) and an outer electrode (3)arranged concentrically to the inner electrode. This is achieved in that a shielding electrode (5) is arranged between the outer electrode (3) and the inner electrode (2). Preferably, the potential ofthe shielding electrode (5) can be actively adjusted to the potential of the inner electrode (2) by means of a corresponding electric connection such that electric fields which are caused by dielectric displacements in parasitic capacitances are effectively shielded from the inner electrode (2) and thus from the capacitance to be measured. For this purpose, a two-part design of the inner electrode (2) is proposed with sections (6) and (7) which can be moved axially relative to each other.

Description

technical field [0001] The invention relates to an electrical measuring device for the capacitive measurement of liquids, the electrical measuring device having an inner electrode which is arranged concentrically with an outer electrode surrounding it, and the electrical measuring device having the inner electrode An insulating element electrically insulates the electrode from said outer electrode. Background technique [0002] Such measuring devices are known and are used, for example, in large kitchens in order to determine the quality of frying oil and / or frying fat used in fryers. Because the individual molecules of the oil or fat break down over time as the frying oil or frying fat is used. This wear or aging process manifests itself as a change in the electrical properties of the oil or grease. In particular, this leads to an increase in the dielectric constant ε of the oil or grease, which is also referred to as the dielectric conductivity. [0003] This change in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/22G01N33/03
CPCG01N27/221G01N33/03G01N27/228
Inventor M·格茨M·闵采尔S·斯塔尔曼
Owner TESTO AG
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