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The SP-PV error is used to exert control on a process so that the value of PV equals the value of the SP. A classic use of this is in the
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to controlling a process. The value of the process variable is continuously monitored so that control may be exerted.
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This article is about the engineering indicator. For the mathematical concept used in thermodynamics, see
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Four commonly measured variables that affect chemical and physical processes are:
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Value of a given part of a monitored or controlled process
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