Introduction Control of sodium chloride (NaCl) concentration at a salt dissolver where solid salt is dissolved in water, is highly important because of the electrolysis efficiency. A conventional way of measuring the concentration of supersaturated NaCl solution had been performed by using non-contact type sensors (e.g., g-ray density meter) since NaCl, impurities, and precipitates are in the solution. In this way, there were disadvantages

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