Bath chemistry and cell operating temperature in Hall-Heroult aluminum reduction cells must be controlled to achieve optimal current and energy efficiency. The conventional way to control the bath ratio and temperature is to regularly take bath samples for chemistry analysis and measure the bath temperature. These measurements are generally performed separately. Moreover, bath samples have to be sent to a laboratory for analysis, with results available in as much as 24 hours later. Due to the delay in getting the bath sample analysis results, control decisions have to be made primarily relying on old and out of sync information.
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