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The degree of correspondence between the ultimately controlled variable and the ideal value in a feedback control system.

Related Terms

ADJUSTABLE DIFFERENTIAL

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

ACTION

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

SHED MODE

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

CATALYST

A substance which speeds a chemical action without undergoing a chemical change itself during the process. Now used in catalytic converters to control amount of unburned hydrocarbons and CO in automobile exhaust.

AUTOMATIC FROST CONTROL

Control which automatically cycles refrigerating system to remove frost formation on evaporator.

CATALYTIC CONVERTER

An integral part of vehicle emission control systems since 1975. Oxidizing converters remove hydrocarbons and carbon monoxide (CO) from exhaust gases, while reducing converters control nitrogen oxide (NOx) emissions. Both use noble metal (platinum, palladium or rhodium) catalysts that can be 'poisoned' by lead compounds in the fuel or lubricant.

AUTOMATION

The employment of devices, which automatically control one or more functions.

CHIP CONTROL FILTER

A filter intended to prevent only large particles from entering a component immediately downstream. Also known as Grit control filter, Last-chance filter

GYROPILOT

An automatic device for steering a vessel by means of control signals received from a gyrocompass. Also called AUTOPILOT

HORSE LATITUDES

The regions of calms and variable winds coinciding with the subtropical high pressure belts on the poleward sides of the trade winds. The expression is generally applied only to the northern of these two regions in the North Atlantic Ocean, or to the portion of it near Bermuda.
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