Treffer: AUTOMATIC CONDUCTOMETRIC ANALYZER OF INHOMOGENEOUS DISPERSED MULTIPHASE SYSTEMS.

There is currently an extremely wide variety of conductivity instruments on the market that offer a huge range of measuring ranges with good accuracy. Most instruments are equipped with a digital display that shows the measurement result immediately, but cannot collect data from measurements with a longer duration and transfer them for further analysis to PC. One of the main problems with these devices is the high cost and the more difficult connection to the computer system. This study presents the design and implementation of a computer module for determining the conductivity of inhomogeneous dispersed multiphase systems using the resistivefrequency method. In this computer module, Arduino and Raspberry microcontrollers are used to extract, process and display the data from the module. The configuration of the complete experimental setup that we designed consists of: • Hardware that is divided into several functional components (blocks 1 - 8): power supply; LM555 controller; AC sensor module; measuring probes with a conical shape and length of 4 cm; Arduino frequency analyzer; module for temperature compensation; Raspberry Pi3 data processing module; Web platform module. • Software - Python and C ++ programs written by the authors to provide data entry, primary analysis and their recording for later processing. The data is stored in a text file. The programme code is provided in the manuscript. Numerous studies have been performed on various materials with constant and non-constant conductivity (tap water, distilled water, cosmetic foams and sponge cake batters) for validation and comparison. An experimentally proven relationship between frequency and conductivity was adapted to the range and parameters of the components of our module. The device demonstrated a wide range of sensitivity from 150 to 5000 µS/cm, dependent on the chemical composition, density and microstructure of the tested materials. The designed automatic conductometer with PC interface possesses a number of advantages compared to the commercial instruments of this type available on the market – high level of adaptivity, automatization, online/inline data acquisition and analysis, opensource code, modularity, small dimensions, low price. To achieve a more precise analysis, a combination of additional electrodes, as well as creation a heat map of the studied object is envisaged. There will be additional optimization and improvement of the written software. [ABSTRACT FROM AUTHOR]

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