This edition is not completely new. The second edition built on the first, and SO does this edition. This work has been almost entirely one of “internationalizing” a work mainly written for the UK. New matter has been added, especially in the areas of analyzers, level and flowmeters, and fieldbus. References to standards are various, ard British Standards are often referenced. International standards are in flux, and most standards bodies are striving to have equivalent standards throughout the world. The reader is encouraged to refer to IEC, ANSI, or other standards when only a British Standard is shown. The ubiquity of the World Wide Web has made it possible for any standard anywhere to be located and purchased, or in some cases, read online free, so it has not been necessary to cross-reference standards liberally in this work.

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