SU819633A1 - Device for determination of penetrability of electroconductive cappilary porous materials - Google Patents

Description

(54) A DEVICE FOR DETERMINING THE PERMEABILITY OF ELECTRICAL WIRING CAPILLARY-POROUS MATERIALS 381 to another for a fixed time, which is measured by signals from the sensor when the hygroscopic material is wetted and short-circuited through it by two sensor wires. the control liquid, for example distilled water, it is necessary to pre-impregnate the hygroscopic gaskets with an electrically conductive solution, for example sushivat. The hygroscopic material prepared in this way, when it is wetted, gives 3 porous material a part of the electrically conductive solution. As a result, the characteristics of the control fluid, affecting the rate of impregnation of the liquid porous material, for example, the surface tension coefficient, can vary B several times. At the same time, the measurement results are significantly distorted. The aim of the invention is to simplify the operation and improve the accuracy of the determination. The delivered chain is achieved by the fact that, in a device for determining the permeability of electrically conductive capillary-porous materials, comprising a housing with an analyte fixed in it. A rial, a container with a working fluid, a sensor consisting of two electrodes connected to an electrical measuring instrument, and electrically insulated hygroscopic gaskets, one of the electrodes is a sample, and the other electrode is made up of at least two pointed rods, spring-loaded and located along the height sample on electrically insulating gaskets In addition, electrically insulating absorbent gaskets can be made hollow and worn on the ends of the rods. FIG. 1 shows the device and the diagram; in fig. 2 and 3 is a sensor circuit; The device (Fig. 1) consists of a housing 1 with a sample 2 fixed on it, an electrical measuring instrument consisting of a belt unit 3 and electrical securing devices 4 and 5 for power supply 6, a tripod 7, and 8 sec forks. working fluid; devices 9 for maintaining a constant level of fluid in the cell. The electrical measuring device is connected to a sensor (Fig. 2 and 3), one electrode of which is sample 2, and the other electrode is made of at least two pointed rods 10 pressed by springs 11 and clamps 12. Spring has stops 13 and 14. Chisg The rods (electrocontacts) depend on the dpina of the sample and the pitch between the measurement points. Electrically insulating gaskets 15 are located between the sample and the rod. The rods at the ends are pointed (narrowed), and the gasket is made solid and seated on the pointed (needle-shaped) end of the rod. The gasket can also be made hollow (Fig. 2), for example, of a conical shape. At the same time she is put on the end of the rod. Between the housing and the sample are the stops 16. The device operates as follows. At the ends of the rods of the horizontally installed body 1 (Fig. 2), gaskets are put, the height of which is more than the height of the constricted (pointed) part of the rod by the value D (for example, D 0.51mm). Spin the rod down, fix its position with the latch 12. This operation is performed with all the rods. Then, stops 16 are placed, the height of which must satisfy the ratio of 1 t N. A stop is placed on the stops 16 and a porous sample is pressed through the gaskets 15 and pressed against the body with bolts. The tabs of the rods are then released from the slots. Springs tighten the rods to the porous sample through prokpadki. In this position, the electrical contact L is shown. The amount of pressing the packing 15 with the spring is regulated by the height of the stops 16 and the stiffness of the springs so that the gaskets do not wrinkle when dry. The contact spot diameter is 12 mm and the area is 0.8-2 mm. The device assembled in this way is connected to the electrical circuit of the measuring system (Fig. 1). Placing the device in the desired position, for example, vertical, the lower end of the porous material is immersed in the working fluid, and the stopwatch 4 is turned on. When the porous material is impregnated with liquid, the hygroscopic pad of the first rod is wetted. As a result, it loses its stability, is crushed, and the end of the rod closes on the porous material. In this position, conventionally shown is electrical contact E (Fig. 2). The stopwatch 4 is turned off, and 5 is turned on by the relay unit 3. When the second electronic contact is reached, the signal enters the burdock unit, which again 58 switches the stopwatch and so on. From the reading of the stopwatches, the transit time of the known liquid distance between the electrical contacts is sequentially determined. The operation of the device provides a simple and accurate determination of the speed and height of the impregnation of capillary-porous materials when using simple measuring equipment. Form 1 of the invention: 1. A device for determining the permeability of electrically conductive capillary porous materials, comprising a housing with a test material fixed therein, a container with a working fluid, and a sensor consisting of two electrodes connected to an electrical measuring instrument. 3 And electrically insulating hybrids: copy spacers, characterized in that, in order to simplify operation and improve the accuracy of determination, one of the sensor electrodes is a sample, and the second electrode is made in the form of at least two pointed rods, preloaded sample height on electrically insulating gaskets. 2. The device according to claim 1, in connection with the fact that the electrically insulating absorbent gaskets are made hollow and worn on the ends of the rods. Sources of information taken into account in the examination 1. USSR author's certificate number 49752O, cl. Q 01N 33/34, 1974. 2. USSR author's certificate M- 14366, cl. Q O1K 15/08, 1978. 3. USSR author's certificate in accordance with the application of M. 2486592, cl. G 01 N 15/08 (prototype).

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Claims (2)

Claim 1. A device for determining the permeability of electrically conductive capillary-porous materials, containing a housing, with the analyzed material fixed in it, a container with a working fluid, _m ^ sensor _? consisting of two electrodes connected to an electric meter, and electrically insulating absorbent gaskets, characterized in that, in order to simplify operation and improve the accuracy of determination, one of the sensor electrodes is a sample, and the second electrode is made in the form of at least two pointed rods, preloaded by a spring > MI and located along the height of the sample on electrical insulating gaskets. 2. The device according to π. 1, characterized in that the electrically insulating absorbent gaskets are hollow and are worn on the ends of the rods.