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Methods for level measurement

A technology of level measurement and total quantity, applied in volume measurement instruments/methods, liquid level indicators for physical variable measurement, measurement capacity, etc.

Active Publication Date: 2015-12-09
ENDRESS HAUSER GMBH CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0016] However, this method can only be applied when the specific capacitance increase factors for the two filling substances and the total level of the two filling substances present in the vessel are known

Method used

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Embodiment Construction

[0062] figure 1 A schematic diagram of a measurement system to which the method for level measurement of the present invention is applied is shown. It comprises a container 1 in which an unknown quantity of a first filling substance 3 and / or an unknown quantity of a second filling substance 5 can be located. If two different filling substances 3 , 5 are present, it is assumed here that the first filling substance 3 has a lower specific gravity than the second filling substance 5 . In addition, the filling substances 3, 5 have different dielectric constants.

[0063] figure 1 A filling state is shown in which the two filling substances 3 , 5 are at rest in the container 1 . The first filling substance 3 forms an upper layer with a filling height H1 in the container 1 , and the second filling substance 5 forms a lower layer below it with a filling height H2 . The first filling substance 3 is, for example, oil, and the second filling substance 5 is water. Above the first fil...

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Abstract

A method for a fill level measurement in which a first and / or a second fill substance can be located. A rest position can be ascertained, when the entire amount of each fill substance in the container forms a single layer containing only this fill substance, wherein the first fill substance has a smaller specific weight than the second fill substance, and the two fill substances have different dielectric constants. An electromagnetic signal is sent into the container, wherein a part of the signal is reflected. A capacitance between a capacitive probe and a reference electrode is measured, dependent on the amounts of the fill substances located in the container, and, on the basis of the measured capacitance and the measured travel times for each fill substance present in the container, the rest position of its fill substance upper surface is ascertained.

Description

technical field [0001] The invention relates to a method for level measurement. Background technique [0002] Level measurement is currently performed in a large number of industrial applications. In typical level measurement, a single fill substance is located in a vessel, the level of which is detected using a level measuring instrument. [0003] In addition, in a large number of applications there is not just one filling substance in the container, but two different filling substances. When two different filling substances with different specific gravities are present in the container, the filling substance with the smaller specific gravity lies above the filling substance with the larger specific gravity under equilibrium conditions. Two completely separate layers formed. The boundary between the two fill substances is called the interface layer. [0004] Interfacial layers occur, for example, in the petrochemical industry, which are formed, for example, from water a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01F23/00G01F23/26G01F23/284
CPCG01F23/284G01F23/0061G01F23/263G01F22/00G01F23/80
Inventor 阿列克谢·马利诺夫斯基赫伯特·施罗思迪特马尔·施潘克
Owner ENDRESS HAUSER GMBH CO KG
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