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



Related Terms

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).

FEEDBACK

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

CORRECTION TIME

The time required for the controlled variable to reach and stay within a predetermined band about the control point following any change of the independent variable or operating condition in a control system. Also known as settling time.

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.

ACTION

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

DRIFT

Term used to describe the difference between the set point and the actual operating or control point.

CATS PAWS

Light variable winds on calm waters producing scattered areas of small waves.

OPERATING POINT

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

DOLDRUMS

The equatorial trough, with special reference to the light and variable nature of the winds.

VRM

Variable Range Marker a radar feature

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