The objective of this paper is to maintain the level inside the process tank in a desired value. The real time implementation of the process is designed and implemented in MATLAB. Gain scheduled PID controller is designed to enhance the performance of the conventional PID controller for nonlinear spherical tank process. It is based on linearization of the nonlinear model around selected operating points. The linear design methods are applied at each region in order to arrive at a set of linear control laws.