People (in the case of manual control) or a controller (in the case of automatic control) must be able to perform this simulation ... If the measured channel residual is 1.8 ppm instead of 2 ppm, the negative error is a negative 0.2 ppm. ... Many measurements are difficult or impossible to make with instruments, and a knowledgeable and experienced person can often do a better job than automatic controllers.
Title | : | M2 Instrumentation and Control, Third Edition |
Author | : | |
Publisher | : | American Water Works Association - |
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