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25 Cards in this Set
- Front
- Back
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The part of a control loop that senses the value of a process variable
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Sensor |
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Device that makes the output signal of the sensing element usable by the rest of the control loop
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Transmitter |
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The part of the control loop that receives a signal from the controller and converts it into an action that causes the manipulated variable to change
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Final Control Element |
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The difference between the lowest and highest reading for an instrument or gauge
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Span |
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The desired value where the process should be maintained
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Setpoint |
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The part of the final control element that converts an input signal into an action
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Actuator |
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The variable manipulated by the final control element
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Manipulated Variable |
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The automatic holding of certain process variables within given limits
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Process Control |
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Process control loop element that determines what action needs to be taken
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Controller |
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A device that changes energy from one form to another
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Transducer |
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The variable measured to indicate the condition of the output of the process
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Process Variable |
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A component, such as a valve, that is capable of operating at any position between fully open and full closed
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Modulation |
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A continuous operating signal
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Analog |
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Those values over which a transmitter is intended to measure
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Range |
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Information in the form of a pneumatic pressure, an electric current, or mechanical position that carries information from one control component to another
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Signal |
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The variable measured to indicate the condition of the output of the process
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Process Variable |
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A control signal that is either "on" or "off"
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Discrete |
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The time required to return a process variable to it's set point following a disturbance
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Lag Time |
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A system in which no comparison is made between the actual value and the desired value of a process variable
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Open Loop |
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The departure from a desired value, usually the result of a sudden or unexpected load change
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Disturbance |
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Part of a closed loop system which provides information about a given variable for comparison with the desired condition (set-point)
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Feedback |
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The difference between the measured signal value and the set point or desired value
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Deviation/ Error |
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A signal path. A combination of two or more instruments or control functions arranged so that signals pass from one to another for the purpose of measurement or control
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Loop |
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A device used to measure and/or control a process variable
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Instrument |
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A combination of control units in which the process variable is measured, compared with the setpoint, and corrected if necessary
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Closed Loop |
