Applications for pH measurement and control can be found in waster treatment facilities, pulp and paper plants, petroleum refineries, power generation plants, and across the chemical industry. In other words, continuous pH analyzers can be found in almost every industry that uses water in its processes. Figure 1 shows an example of pH control—a P&ID of the manufacturing of disodium phosphate using flow and pH control. The automatic control system shown in the figure produces a high-purity salt and prevents
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| Sample P&ID: Disodium Phospate Mfg. |
unnecessary waste of both reagents (i.e., soda ash and phosphoric acid).
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| Yokogawa PH450 EXAxt Analyzer for pH and ORP |
