The value of the controlled variable which the controller operates to maintain.


Related Terms

INTEGRAL-MODE CONTROLLER

A controller which produces a control signal proportional to the integral of the error signal.

ACTION

Refers to the action of a controller. It defines what is done to regulate the final control element to effect control.

BULB

The name given to the temperature-sensing device located in the fluid for which control or indication is provided. The bulb may be liquidfilled, gas filled, or gas-and-liquid filled. Changes in temperature produce pressure changes within the bulb which are transmitted to the controller.

FIRING RATE CONTROL

A pressure temperature or flow controller which controls the firing rate of a burner according to the deviation from pressure or temperature set point. The system may be arranged to operate the burner on-off, high-low or in proportion to load demand.

PROPORTIONAL CONTROL

A mode of control in which there is a continuous linear relation between value of the controller variable and position of the final control element (modulating control).

OPERATING POINT

The value of the controlled condition at which the controller actually operates. Also called control point.

FEEDBACK

The part of a closed loop system which provides the controller with information about the controlled variable for comparison to its desired value.

DEAD-TIME COMPENSATION

The modification of a controller to allow for time delays between the input to a control system and the response to the signal.

DIRECT EXPERT CONTROL SYSTEM

An expert control system that contains rules that directly associate controller output values with different values of the controller measurements

EXCEPTION HANDLING

The actions taken by a control system when unpredictable conditions or situations arise in which the controller must respond quickly.

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