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Anti-delay MFA pH Controller

When combining the Time-varying MFA and MFA pH control functions, an Anti-delay MFA pH controller is generated that can control a pH process with large and varying time delays.

When a pH process has large varying time delays as well as large inflow rates and pH changes, the difficulty for this control loop quadruples. The extremely large gain changes with varying time delays makes an already bad situation worse, causing the process to become almost "uncontrollable." Traditionally, a "bang-bang" type of control or batch-based pH neutralization would be the only solution.

The Anti-delay MFA controller has the combined power of being predictive, adaptive, and robust. It is adaptive to compensate for the large gain changes, predictive to deal with large time delays, and robust enough to handle inflow changes, titration curve moves, and other uncertainties.



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