In industrial control systems the liquid level is carrying its significance as the control action for level control in tanks containing different chemicals or mixtures is essential for further control linking set levels. The three tank level control techniques are well thought-out in our work. In conventional model for three tank liquid level, the control was done with predictable PID control m o d e l. The auto fine-tuning performance of PID regulator is adopted for more dependable and

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... control action which incorporate the uncertain factors also. A new evolution function including the system adjusting tiem, rise time, onreshoot, and system error is defined. By optimizing the PID controller and comparing the results obtained by conventional methods like Ziegler-Nichols using this techniques method the systems time delay and performance improved.