Final Control Elements
This chapter describes the final control elements of instrumentation systems. Featured are the control valves that operate either by signals from a controller or by manual action to control the transmission and cut-off of fluids such as liquids, gases, an
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Tasuku Senbon, Futoshi Hanabuchi (Eds.)
Instrum entation Systems Fundamentals and Applications
Springer-Verlag Berlin Heidelberg GmbH
Instrumentation Systems-Fundamentals and Applications.
All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic, mechanical, recording or otherwise, without the prior written permission of the copyright owner. First published in Japanese in 1987 by Ohmsha, Ltd. Tokyo as Shisutemu no Kiso to OuyouJ
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© 1991 Springer-Verlag Berlin Heidelberg Originally published by Springer-Verlag Berlin Heidelberg New York in 1991 Exclusive worldwide distribution by: ISBN 978-3-662-12091-0 ISBN 978-3-662-12089-7 (eBook) DOI 10.1007/978-3-662-12089-7
PREFACE
This book, though small, contains a wealth of technical information on control engineering and instrumentation engineering for industrial quantities, on control-system component elements (sensing, conversion, control, monitoring, and actuation), and on the system-design approaches (system engineering) used in process automation (PA) and factory automation (FA), discussing them based on examples of their applications, and covering everything from basics to applications. Process automation has a long history, with automation of individual functions having begun as early as the 1920's. The feedback control techniques that constitute its basis grew into an indispensable core technology along with the rapid advance of control theory and control devices from the 1960's onward. Today we are progressing further towards system-scale optimal control technology. One of the influences that spurred major innovation along the way was the birth of microprocessor-based digital computer control in the 1970's. This enabled the realization of batch and sequential control together with feedback control in the same processor thus allowing an intimate interlinkage among them all. Technology for communication between multiple processors was also introduced, fostering rapid advances in functional sophistication and installation density. Moreover, this did not stop with process automation, but also spread to total factory automation covering entire plants. This included factory automation aimed at discrete processes. This book begins with a discussion of control theory. It moves on to discuss the product hardware and software that implement the theory, and then proceeds to describe instrumentation examples and the system-design approaches (system engineering) suitable for a variety of production processes. Thus, we believe it to be ideally suited for use as a college-level textbook on instrumentation and automation for undergraduate or graduate students, or as a reference book for practicing instrument engineers in industry. Since the subject matter deals with extremely specialized technoloPreface
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gy, the responsibility for the authorship has been undertaken by Yokogawa Electric experts continually involved in these areas. The Yokogawa Electric Training Cen
