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The operational definition of water turbidity is an important step in checking the quality of drinking water. In this work an analysis of existing methods and systems of operational control of turbidity of water was carried out, and design of turbidimeter consisting of a two-channel sensor (measuring and reference channels) and a measuring device (transmitter) was proposed. Unlike other methods, where the comparison, when applying feedback, is carried out in light passing through the photocurrent of the photodetector or on a measuring bridge, in the proposed design, the turbidimeter is compared to the measured medium (water), which allows to sharply improve the metrological characteristics of the turbidimeter. The results of the study of the operation of turbidimeter during forced water supply of river water through it by centrifugal pump are considered, this is due to the impossibility of direct water supply to it through a complicated water intake relief. The installation on a base of hardware-software tool of the Siemens WEB-based system of monitoring water turbidity in the water intake of public enterprise «Ivano- FrankivskVodoekotekhprom» on Bystrysia Solotvyn and Bystrytsia Nadvirna rivers and results of its exploitation are considered. It has been shown that the use of this system allows to react promptly to a sharp change of water turbidity and to prevent entering it to the treatment facilities and, thus, significantly reduce the cost of water purification
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