What role do sensors play in a control system?

Sensors are critical components in a control system as they are responsible for measuring the process variable and providing feedback. This feedback is essential for the control system to function effectively. When a sensor measures a physical quantity, such as temperature, pressure, or flow rate, it converts that measurement into a signal that can be interpreted by the controller. This data allows the controller to compare the actual value of the process variable against the desired setpoint.

The accuracy and reliability of the measurements provided by the sensors directly influence the performance of the control system. When the controller receives real-time data from the sensors, it can make informed decisions to maintain or adjust the process. For example, if a temperature sensor indicates that the temperature in a furnace exceeds the setpoint, the controller can take action to reduce the heating output.

In essence, the role of sensors in a control system is fundamental as they bridge the physical process and the control logic, enabling the system to maintain desired operating conditions effectively.