RU2362153C1 - Cell for measuring electroconductivity of wet dispersed materials - Google Patents

Abstract

FIELD: electrical engineering.

SUBSTANCE: invention can be used for determining electroconductivity of wet soil, ceramic mixtures, cement, concentrated suspensions and other wet dispersed materials. The cell for measuring electroconductivity of wet dispersed materials contains a measuring vessel made from dielectric material with a rectangular cross section, fitted with two electrode plates, connected to the electrical circuit of an electrical measuring instrument. The measuring vessel is in form of a hollow tetrahedral prism, two opposite faces of which are fitted with electrodes from the inside, with a shape similar to the shape of the said faces. Measurements are taken when the test material moves through the inter-electrode space of the measuring cell.

EFFECT: invention is aimed at increasing accuracy and making easier measurement of electroconductivity of wet dispersed materials.

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Description

The invention relates to devices for measuring the electrical conductivity of wet dispersed natural and artificial materials, in particular to the designs of measuring vessels and electrodes, and can be used to determine the electrical conductivity of wet soils and soils, ceramic masses, cement pastes, concentrated suspensions and other wet dispersed materials.

A device for measuring the electrical conductivity of soils (RF Patent No. 2044308, IPC 6 G01N 27/22, publ. BI No. 26 - 95). This device comprises a housing with a bottom of dielectric material, as well as two supply and two receiving electrodes. The base is made in the shape of the bottom of the housing with the ability to move along the longitudinal axis of the housing. A hollow handle is fixed at the bottom of the housing, through which a rod connected to the dielectric base passes, and a spring is located in the handle, located between the bottom of the housing and a stop rigidly connected to the stem. At the same time, one of the supply and two receiving electrodes is placed on the dielectric base, and the second supply electrode is mounted on the side wall of the housing.

The disadvantages of the device according to the patent of the Russian Federation No. 2044308: the complexity of the design, the complexity of the measurement process.

A known measuring cell for determining the electrical conductivity of soils (Neprin SV, Chudnovsky AF Soil Physics. - M .: Publishing House "Science". - 1967 - p. 352-357. Prototype). The measuring cell consists of a measuring vessel and two electrodes connected to the electrical circuit of an electrical measuring device. The measuring vessel is a container with a rectangular cross-section, equipped with an upper and lower base. The vessel and base are made of dielectric material. The bases are equipped with the above-mentioned electrodes in the form of plates of a rectangular shape, that is, with the shape of the bases. In order to improve the contact between the particles of the test soil, as well as between the electrodes and the soil, the latter is sealed in a vessel before the conductivity measurements. To obtain reliable data on the electrical conductivity of the soil, measurements are made repeatedly, and each time a soil sample is replaced.

The disadvantages of the known measuring cell: low measurement accuracy, high complexity of the measurement process. The first drawback is explained by the following. In the process of measuring the electrical conductivity, the soil is in a static state, and there is no external pressure on it. For this reason, the contact between the soil particles is not tight enough, and the contact between the soil and the electrodes is unreliable. The second drawback is due to the fact that in order to obtain reliable data, measurements of the electrical conductivity of the soil must be performed repeatedly, and these measurements are carried out manually.

The task is to increase accuracy and reduce the complexity of measuring the conductivity of the material.

This problem is solved as follows. In accordance with the prototype, the cell for measuring the electrical conductivity of wet dispersed materials contains a measuring vessel with a rectangular cross section of a dielectric material, equipped with two plate electrodes included in the electrical circuit of an electrical measuring device. According to the invention, the measuring vessel is made in the form of a hollow tetrahedral prism, the two opposite faces of which are provided with electrodes with a shape similar to the shape of the said faces.

Further, the invention is illustrated by drawings, which depict:

- figure 1 - construction of the measuring vessel in longitudinal section;

- figure 2 - design of the measuring vessel in cross section.

The cell consists of a measuring vessel 1 and two electrodes 2. The measuring vessel 1 is made of dielectric material and is made in the form of a tetrahedral hollow prism. Two opposite faces of this vessel are equipped with plate electrodes 2 connected via terminals 3 to the electrical circuit of an electrical meter (not shown). The electrodes 2 are made of metal, and their shape is similar to the shape of the faces of the measuring vessel 1. One end of the measuring vessel 1 is connected to the feed mechanism of the wet dispersed material 4 into the said vessel. This mechanism is a cylinder 5, equipped with a screw or piston 6.

Under the influence of a screw or piston 6, the wet dispersed material 4 is squeezed out of the cylinder 5 and enters the measuring vessel 1, as a result of which the electric circuit of the electrical measuring device closes and the electric current flows between the electrodes 2 through the wet dispersed material 4. In the process of forcing the wet dispersed material 4 through the measuring the vessel 1 and the current flowing through it, the conductivity of the investigated wet dispersed material is measured.

Since the wet dispersed material is pressed through the measuring vessel under a certain pressure, firstly, the contact between the particles of the test material is improved, and secondly, the contact reliability between the wet dispersed material 4 and plate electrodes 2 is improved. All this improves the accuracy of the conductivity measurement material, which can be judged by comparative determinations of the electrical conductivity of clay masses presented in the table in figure 3. Higher and more stable reproducibility values of electrical conductivity obtained on the proposed device, indicate the reliability of the contact between the electrodes of the test material. During the measurement process, a significant amount of wet dispersed material 4 can be forced through the measuring vessel 1, and accordingly a series of measurements can be made without stopping the measurement process. This reduces labor intensity and improves measurement performance. In addition, the use of this cell makes it possible to automate the operations of obtaining and processing measurement results.

The technical result of the invention: improving accuracy and reducing the complexity of the process of measuring the electrical conductivity of wet dispersed material.

Claims (1)

A cell for measuring the electrical conductivity of wet dispersed materials, containing a measuring vessel with a rectangular cross section of dielectric material, equipped with two plate electrodes included in the electrical circuit of an electrical measuring device, characterized in that the measuring vessel is made in the form of a hollow tetrahedral prism, two opposite sides of which are provided on the inside electrodes in a shape similar to the shape of the mentioned faces, and measurements are carried out during the movement of the test mat Series through the interelectrode space of the measuring cell.

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