Markovskyi I. RF-Method And Device Of Measuring Control Of Concentration Of Minerals in Water

The research object is the process of measuring control of water quality parameters. The purpose is to enhance the reliability and performance of the overall the measuring control of salinity and water hardness, as well as the determination of the quantitative composition of the basic salts of fresh water at its express-analysis using its frequency characteristics. Methods of research - theoretical studies based on the use of the theory of probability and mathematical statistics, experimental studies based on the theory of measurement and errors, instrumental methods of chemical analysis, the theory of the measuring systems and the planning of experiments. Theoretical results - the systematic investigation and study of frequency characteristics in a wide range of concentrations for aqueous solutions of salts, which content in water is the most significant, is carried out for the first time, which made it possible to establish the empirical relationships of these characteristics on the concentration of the corresponding salts and develop a method of measuring control of concentration of minerals in water. The radio frequency method of measuring control of the total concentration of minerals in the water and the water hardness, which differs from the existing ones with using of measurement of radio-frequency characteristics of the water in the radio frequency range, improving the accuracy of control, is developed and researched for the first time. The ratio between the resonance frequency of the measuring cell and the total concentration of minerals in solution, which is analyzed with the developed RF-method of measuring control of water quality parameters is theoretically studied and experimentally confirmed. The practical results - the method for quantifying the component composition of liquids is developed for the first time, which differs from the known analogues with possibility of its application for both non-electrolytes solutions and aqueous solutions of electrolytes, which substantially reduced the time required to obtain preliminary results of the analysis parameters of the quality of water samples from different sources. An experimental model of measuring control device for the control of the concentration of minerals in the water by measuring its frequency characteristics is created. The degree of implementation - the results of the thesis are used in organizations that carry out the analysis and monitoring of drinking water and water treatment in the Donetsk region , as well as in teaching in the Department of Electronic Engineering "Donetsk National Technical University", Donetsk) . The area of use - water quality monitoring.