Control Vocab

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15 Terms

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Control Loop

sensor-transmitter-controller-control element

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Primary Element

first sensor

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Transmitter

senses a process variable & converts it to an output signal

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Final Control Element

directly regulates the process

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P&ID

process & instrumentation drawing

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Loop Sheet

connection between control loop devices, location, & signal path between devices

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Specification Sheet

spec sheet

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Instrument

device that measures or controls

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LRV

lower range value

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URV

upper range value

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Span

urv-lrv

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Live zero

4ma

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Discrete Signal

either on or off, open or closed, etc

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Analog Signal

continuous operating signal that is a continuous representation of physical quantity, property, or condition

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Digital Signal

transmits information via a sequence or pattern of high and low values