In a control system, as the controlled variable decreases in temperature, what occurs to the branch pressure from the temperature controller?

In a control system, when the controlled variable, such as temperature, decreases, the temperature controller responds by adjusting the output to maintain the desired setpoint. If the temperature drops, the controller interprets this as a deviation from the target value and activates corrective actions to restore the temperature.

Specifically, in many systems, a decrease in temperature would typically require an increase in branch pressure as part of the effort to bring the temperature back up to the setpoint. This may involve increasing the flow of a heating medium or adjusting a valve that controls the flow of heated fluid.

Therefore, as the temperature decreases, the controller increases the pressure in the system to facilitate the delivery of energy needed to raise the temperature back to the desired level. This response is characteristic of a feedback control system aimed at achieving stability and maintaining the controlled variable at its target value.