A type of controller that receives sensor output from the process variable is referred to as a ___________ controller.

A feedback controller is one that utilizes the output from a process variable to make adjustments to the system. This type of controller continuously monitors the process variable and compares it to the desired setpoint. When there is a deviation between the actual process variable and the setpoint, the feedback controller processes this information and modifies the control action to reduce the discrepancy.

The effectiveness of a feedback controller lies in its ability to respond appropriately to real-time conditions, ensuring that the operation of the system remains stable and meets the desired performance levels. This concept is fundamental in wastewater collection systems, where maintaining specific flow rates and levels is crucial for operational efficiency and safety.

In contrast, the other options do not accurately describe this function. An input controller might suggest sourcing raw data for control actions without the feedback mechanism, while an output controller typically would not be engaged in the corrective measures stemming from measured data. A control controller could be interpreted in various ways but does not specifically reference the relationship between sensor outputs and system adjustments like a feedback controller does.