Method for filling level measurement

Abstract

A method for filling level measurement is disclosed, using which, in a container (1), in which a first and / or a second filling product (3, 5) can be located, for each filling product (3, 5) contained in the container (1), a rest location can be determined, which corresponds to the location which the filling product surface of the particular filling product (3, 5) assumes because of the quantity of the first filling product (3) which is contained in the container (1) and the quantity of the second filling product (5) which is contained in the container (1), if the total quantity of each filling product (3, 5) in the container (1) forms a single layer containing only this filling product (3, 5), wherein said first filling product (3) has a lower specific weight than said second filling product (5), and said two filling products (3, 5) have different dielectric constants (e), wherein an electromagnetic signal (S) is transmitted into said container (1), a reflection occurs on at least one media boundary generated by said filling products (3, 5) contained in said container (1), wherein a component (Rx, Ry) of said signal (S) is reflected, and for each reflected component (Rx, Ry), a run time (Tx, Ty), which is a function of the location of the media boundary triggering the reflection, is measured, which said component (Rx, Ry) of the signal (S) requires for the route to this media boundary and back, a capacitance (C), which is a function of the quantities of the filling products (3, 5) located in the container (1), is measured between a capacitive probe (13) and a reference electrode (15), and the rest location of said filling product surface is determined for each filling product (3, 5), which is, contained in the container (1), on the basis of the measured capacitance (C) and the measured runtimes (Tx, Ty).

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...

AI Technical Summary

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

Images