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The portion of a feedback control system that acts on the process or machine being controlled. control hierarchy See hierarchical control.

Related Terms

ADJUSTABLE DIFFERENTIAL

A means of changing the difference between the control cut-in and cut-out points.

SAFETY CONTROL

Device to stop unit, equipment or system if unsafe pressure and/or temperatures and/or dangerous conditions are reached.

AGGLOMERATION

The potential of the system for particle attraction and adhesion.

REMOTE REFRIGERATING SYSTEM

Refrigerating system in which condensing unit is away from space to be cooled.

ACTION

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

FILTER ELEMENT

The porous device that performs the actual process of filtration. Also known as Cartridge

HYDROFINISHING

A process for treating raw extracted base stocks with hydrogen to saturate them for improved stability.

SHED MODE

A method of demand control that reduces kW demand through shedding and restoring loads.

ACID ATTACK

Caused by an incomplete flushing after an acid cleaning process of boilers or similar equipment.

ABSORPTION

The assimilation of one material into another; in petroleum refining, the use of an absorptive liquid to selectively remove components from a process stream.
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