SU690374A1 - Conductometric cell - Google Patents

Description

. The invention relates to the field of phyochemical analysis and can be found in chemical, metallurgical; food and other areas of industry, y) and the study of hydrodynamic processes.

Equal conductometric cells with flat, cylindrical or spherical electrodes that are parallel or co-axial with respect to; fug {II.

However, the known cells do not allow non-epbiBffi to record changes in the specific electrical conductivity of the fluid in the zone of passage of air (gas) through the solution.

Bubbles of air (gas), falling into the interelectrode space or in the area of passage of the conduction cell current lines, substantially indicate information on the electrical conductivity of the solution and make it difficult to obtain some O14) single value of the specific electrical capacity of the liquid.

The reason for this is the unsteady giving of air (gas) bubbles;

shapes and sizes in the interelectrode space in the region {for the flow lines (the boundary effect) and the increase in the active (working) surface of the electrodes due to the adhesion of puff of air (gas) to the working surface of the electrodes.

The closest technical solution is a cell containing two cycling electrodes - one in the other 2.

This cell cannot be used to register the modified specific electrical conductivity of the fluid in the zone. intense passage of air (gas) bubbles. Since the bubbles will pass both through the interelectrode space, and through o (5) the passage of the yuk lines, the measurement accuracy decreases.

Claims (2)

Air bubbles (gas) will stick to the working surface of the electrodes and be held there for a long time. This leads to a decrease in the working surface of the electrodes and an increase in the current through the areas of the working surface of the electrodes that are not covered by air (gas) bubbles, therefore, electrolysis may occur, in which gas bubbles on the electrodes will also be released. A long delay of air (gas) bubbles on the working surface of the electrodes can cause a change in the state of the working surface of the electrodes, i.e. a change in the characteristic of the sensitive element (electrolytic constant), which will lead to an additional decrease in the measurement accuracy. The purpose of the invention is to improve the measurement accuracy. The linked target is achieved by the fact that the outer electrode is made in the form of an elliptical view {) a, truncated along the minor axis on the Trpl of the ellipse, and the inner electrode is located at the focus of the guide ellipse, and to exclude the influence of air (gas) from the front side of the ellipse. the inner electrode is shorter. The drawing shows a conductometric cell having an outer electrode 1 in the form of an elliptical cylinder truncated along the scarlet axis of the Lips: Inside the electrode 1 at the focus of the ellipse, place electrode 2 in parallel to the axis of the cylinder. Electrodes of the conductometric electrode are electrically insulated from each other by a dielectric 3. If the electrode is identical, the electrode 2 is identical to the electrode 2. the inevitable influence of the edge eons of the location of the current research institute when the air bubbles (gas) are located through the solution. V: ;; v In order to avoid the influence of the edge effect, it is necessary that electrode 2 is shorter than electrode 1 by at least three interelectrode distances Ui 3h) .. / The free open end of the ionometric cell provides a necrose exchange of space between the electrodes, which makes it possible late in time to register changes in the electrical conductivity of the liquid. The placement of the conductometric cell nep peydik Rio to the intensive flow of air puyeks (gaea) relative to the small axis of the ellipse, its plane of cross section, the selected form of dB and their relative position provide continuous recording of changes in the electrical conductivity of the liquid under bubbling conditions with almost a small error. Conductometric cell works as follows. The cell is placed in the studied zone of the reactor (apparatus). A change in the composition (concentration) of the solution at a given point of the reactor causes a change in the electrical conductivity in the interelectrode space of the cell and a change in the output signal of the instrument. The upward flow of air (gas) fluids is dissected by the outer elliptical surface of the electrode and forms it in such a way that the air (gas) does not fall into the interelectrode space or into the scattering zone of the electromagnetic field. The constructive characteristics of the electrodes provide, in the presence of an upward flow of fluid, an effective and malrinertionary exchange of sidness in the interelectrochelectron. Thus, the use of a cell will allow to solve the problem of measuring electrical conductivity in liquid streams with gas B1 cases and thereby: automatize the processes of studying chemical reagents and controlling technological processes, and also significantly increase the reliability of automated control systems. The invention of the Condou :: tommetrice cell for the study of hydrodynamic processes, containing two coaxial electrodes, characterized by the fact that, in order to improve measurement accuracy, the outer electrode is elliptical in the form of an elliptical cylinder truncated along the small axis of the direction of the) the internal electrode is located at the focus of the ellipse, and the internal electrode is short. Sources of information taken into account in the examination 1. B. Lopatin. Conductometry, Novosibirsk, 1964, p. 220 2. USSR author's certificate number 185537, cl. G 01 N 27/02, 1963. GoGo - 12 current Oh oh oh THEM Suppression of the flow of PUZH 8-blow (gas) Mala axis e / tffunca