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The compensation of a pH process is complicated by the non-linear nature of the process titration curve and the significant time delays that typically exist in such processes. This paper will propose the use of a gain scheduled piecewise adaptive PI controller to compensate the process. A pilot plant is controlled, with the control algorithm implemented on a programmable controller. SCADA software displays and trends the plant and controller signals.
O'Shaughnessy, Eugene and O'Dwyer, Aidan : The gain scheduled piece-wise adaptive digital control of a pH process. Proceedings of the International Postgraduate Student Research Conference, Dublin Institute of Technology, November, 1998.