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Variable Speed Drives, 4th Edition by David William Spitzer

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Instrumentation Basics

5

Instruments are applied to industrial processes to remotely sense and display various process parameters. The information provided forms a part of the basis from which decisions regarding the operation ‘of the process are made. Such decisions may be made manually after examining the data or by utilizing measurement and control devices automatically. The ultimate goal of applying instrumentation and associated controls to a process is to achieve safe, stable, reliable, and economical plant operation.

PROCESS CONTROL

A generalized process with associated measurement and control devices can be modeled as shown in Figure 5.1. Such a model is composed of the process with associated disturbances, a measurement of a parameter ...

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