By Peter B. Stockwell

ISBN-10: 020397963X

ISBN-13: 9780203979631

ISBN-10: 0748404805

ISBN-13: 9780748404803

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6° with respect to the equipment mainframe every 24 s. Since the rotor carries within itself the continuously scanning beam of the absorptiometer, another monitoring device is required to define the scanning sector, and to relate the effect of the double movement of the beam to the mainframe. This is achieved by fitting a light-emitting diode (LED) to the end of the arm A, which is fixed to the rotating encoder tube T. A light-shield (not shown), drilled with 100 holes on its circumference, covers this rotating miniature light-source, and the passage of the light behind the 100 holes is monitored by two photodetectors fixed to the equipment mainframe.

4 PRINCIPLES OF AUTOMATIC INSTRUMENTS Besides understanding the philosophy and concepts of automatic instrumentation, it is necessary to make a clear economic assessment of the advantages to be gained from the introduction of automation. There can be no substitute for practical experience in solving such problems. The field is wide, so a complete review is not practical. Some developments are described here to stimulate the reader into deeper research. It is important to evaluate the various developments that have become available through both large and small instrumentation companies.

Aspects of management, education and economics are given scant treatment despite their importance. The Journal of Automatic Chemistry [8] was launched to fill this void in the literature and experience has shown that there is a wealth of technical experience awaiting publication. In addition, it is vital for the suppliers of automatic instrumentation and computer systems to set up adequate lines of communications with their customers. User groups are a valuable asset so that experiences, good and bad, are shared and any problems resolved.

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Automatic Chemical Analysis: Second Edition by Peter B. Stockwell


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