Design of a Heating Control System for Rheometer

This paper describes the heating system of rheometer and a method to ascertain the settling down of temperature of a closed volume under PID control. When the temperature stays within the desired band about the SET POINT for a predetermined time, a temperature OK signal is obtained which is used to allow further plant processes to be carried out. The developed system consists of RTD sensor, its signal conditioning, PID controller, solid-state relay and a circuit around digital IC'S.