The setup consists of a process tank in which compressed air enters through a Pneumatic control valve. The pressure transmitter is fitted on the process tank. The air pressure in process tank is sensed by the transmitter and communicated to the digital indicating controller. This measured variable is compared with the Set Point by controller and output is generated and given to I/P converter, which in turn supply the 3-15 Psig pressure to vary the opening of the Pneumatic control valve to eliminate the error observed. As the opening of pneumatic control valve varies, the pressure in the Process Tank gets effected. This process goes on until the Set Point target is achieved. A ball valve is also provided in the process tank to disturb the system and to observe the effect of disturbance. These units along with necessary piping are supported in a well-designed housing and are fixed on base plate.