The problems that arise in the express control of hydrocarbon media and their mixtures, in the case when the mixture consists of three components, are considered. One of the key features of measurements is the measurement of mixtures at different wavelengths. A system of equations was derived to determine the composition of the mixture under study. Refractive indices of various mixtures whose composition was known in advance were measured. The measurement results of different volatile hydrocarbon media and their mixtures of three components are presented. The result of the measurements and subsequent data analysis revealed the advantages and disadvantages of the method of express control of three-component mixtures of hydrocarbon media. A plan for further development of the method to solve the problems encountered, as well as its refinement and improvement was elaborated.
$^1$"The Bonch-Bruevich Saint Petersburg State University of Telecommunications"
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