A __________ controller receives sensor output from the process variable and compares it to the setpoint or desired result then adjusts the system accordingly

A feedback controller is specifically designed to continuously monitor a process by receiving sensor output related to a process variable and comparing it to a predetermined setpoint or desired outcome. When inconsistencies arise between the actual process variable and the setpoint, the feedback controller makes necessary adjustments to the system to minimize that difference, effectively maintaining the desired level of operation.

This type of control mechanism relies on real-time data, which allows it to respond dynamically to variations and disturbances in the system, ensuring stability and optimal performance. This process is integral in various applications, including wastewater treatment, where maintaining parameters like flow rate, chemical dosing, and water quality is crucial.

In contrast, the other types of controllers serve different functions. A manual controller requires human intervention for adjustments, a feed forward controller anticipates changes and adjusts the input before deviations occur, and a compound controller utilizes multiple control techniques. However, it is the feedback control loop that plays the primary role in continuously correcting the system based on its current performance relative to established goals.