The project involves the automation of reaction vessel. A Reaction Vessel is an essential component of Chemical Plant. All the processes taking place within the vessel are to be maintained. The control system is designed so as to achieve the recommended conditions required for chemical reaction to occur. The control system is designed as follows i) If the temperature is low, heating and circulation should start. ii) If the temperature is high, cooling and circulation should take place. iii) If the pressure is sensed low, heating and circulation should start and additionally the state should turn to startup. iv) If the pressure is high, an alarm is triggered which could be reversed by acknowledging the alarm button or by switching off the system.