Which of these components can be part of a cascade control system?

In a cascade control system, the arrangement typically includes multiple controllers, each dedicated to a different control loop, where one controller's output serves as the setpoint for another. This layered approach allows for more precise control of complex systems by breaking down the control tasks into manageable segments.

In this scenario, having two controllers enables the first controller to manage a primary variable, while the second can deal with a secondary variable that is influenced by the primary. The inclusion of two transmitters in this setup allows for accurate measurement of the respective variables being controlled, which is essential for effective feedback within the system. Additionally, having one valve enables the control of the flow or pressure of the process fluid based on the output of the control loop.

This configuration provides a robust means of maintaining desired setpoints through a more refined approach, effectively responding to disturbances and variations in the system. Therefore, the combination of two controllers, two transmitters, and one valve is ideal for establishing a functional cascade control system, allowing for improved performance and stability in the control process.