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- W2952790733 abstract "The problems of ecological safety of the water resources require permanent supervision of the water quality in water ponds. Conclusion on suitability of a particular pond water and selection of the water conditioning technique require a rapid estimate of the water quality, specifically, usage of the equipment for rapid analysis of the water parameters. Characteristics of the system for the rapid analysis of the water parameters and accuracy of its operation are determined by quality of the primary converters. The problem of decreasing errors while using the pH electrodes in the monitoring systems and ecological researches of waters from the industrial water wastes, rivers, lakes and other water ponds is vital. The Article is devoted to development and research of the pH sensor, which allows to transmit results of the measurement on distance under 50 m. The main advantage of the sensor is a pinpoint accuracy and digital counting out to the information. The structural diagrams and features of the pH sensor are given. The sensor primary converter is a modernized glass electrode equipped with operability control device and built-in thermal compensator which allows to exclude influence of the water temperature on its output signal as the EMF being proportional to the pH value. The method of determining the glass electrode accuracy is considered. The signal from the glass electrode via the amplifier and the analog-to-frequency converter may be transmitted to the digital counting device or to the information and measuring system input. The peculiarity of the sensor amplifier is a high (up to 1013 Ohm) input resistance to match it with the glass electrode output resistance and the thermal compensation circuitry used to decrease influence of the ambient temperature on the sensor output signal. The article presents the structural diagram of the designed glass electrode, the schematic circuit diagram of the amplifier thermal compensator and local diagram of testing and calibration of the designed sensor. Technology of determining the basic error of the sensor which doesn’t exceed 1,37 % and its accuracy rating of 1,5 is given." @default.
- W2952790733 created "2019-06-27" @default.
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- W2952790733 date "2019-05-31" @default.
- W2952790733 modified "2023-09-27" @default.
- W2952790733 title "pH SENSOR WITH FREQUENCY OUTPUT FOR ECOLOGICAL CONTROL OF WATER" @default.
- W2952790733 doi "https://doi.org/10.20998/0821.2019.01.03" @default.
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