Auto Temperature Control of Furnace using Intelligent Modular Controller

Temperature adjustment inside the furnace is a tedious task even though dedicated temperature controllers are available in the marker. Maintenance of stable temperature and pressure is a challenging one. The temperature of the furnace is sensed by the RTD passive sensor or transducer and it is fed back to the Q-Modular Controller. The Q-Modular Controller adjusts the fuel flow system of the furnace based on the reference temperature value. The PID algorithm is developed in the ladder programming by comparing the actual and reference temperature signals from the furnace. The control signal produced by the PID algorithm adjusts the valve opening and closing mechanism of the furnace. The valve open/close is achieved by coupling 12V DC motor with the valve mechanism. Special function modules are installed with the Modular PLC in order to handle the analog signals. Count averaging process is used for sensing the temperature from the furnace and the Digital and Analog outputs are used for performing fuel flow adjustment.