A good example of temperature control using PID would be an application where the controller takes an input from a temperature sensor and has an output that is connected to a control element such as a heater or fan. The controller is usually just one part of a temperature control system, and the whole system should be analyzed and considered in selecting the proper controller.
PID Controller Problem Example
Almost every process control application would benefit from PID control. Here are several PID controller problem examples:
Heat treatment of metals: "Ramp & Soak" sequences need precise control to ensure desired metallurgical properties are achieved.
Drying/evaporating solvents from painted surfaces: Over-temperature conditions can damage substrates while low temperatures can result in product damage and poor appearance.
Curing rubber: Precise temperature control ensures complete cure is achieved without adversely affecting material properties.
Baking: Commercial ovens must follow tightly prescribed heating and cooling sequences to ensure the necessary reactions take place.