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16 Cards in this Set
- Front
- Back
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process control |
A system that combines measuring material and controlling instruments into an arrangement capable of automatic action |
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variable |
A value measured by a instrument |
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process variable |
The dependent variable that is to be controlled in a control system. |
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control variable |
The independent variable in a process control system that is used to adjust the dependent variable, the process variable. |
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primary element |
The sensing device that detects the condition of the process variable |
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Control element |
a device that compares a process measurement to a setpoint and changes the control variable to bring the process variable back to the set point . |
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final element |
a device that receives a control signal and regulates the amount of material or energy in a process |
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measuring element |
a device that established a scaled value for the measured process variable |
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bias |
a systematic error or offset introduced into a measurement system |
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accuracy |
The degree to which a observed value matches the actual value of a measurement over a specified range. |
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precision |
The closeness to which elements provide agreement among measured values |
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repeatability |
The degree to which an element provides the same result with successive occurrences of the same conditions |
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sensitivity |
The smallest change of a value a primary element can detect, the smallest change in input that can cause a control element to change its output, or the smallest change a final element can produce. |
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dead zone |
a condition where there is no response to a change because the change is less than the sensitivity of an element |
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drift |
A gradual change in a variable over time when the process conditions are constant |
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reprodicibility |
The closeness of agreement among repeated measured values when approached from both directions |
