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DAVID W. SPITZER'S E-ZINE
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TECHNICAL AND MARKETING SERVICES
FOR INSTRUMENTATION SUPPLIERS AND END-USERS
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Fieldbus creates a data set for each transaction consisting of the value of the desired variables/attributes and the status and mode of the device sending the message. In Fieldbus, status has a special meaning with respect to the quality of the data. The data may be classified as: good, uncertain, or bad.
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Over the past couple of months I described the operation of a horizontal extractor whose outlet flow of "clean" water at one end of the extractor was controlled using the interface level on the opposite end of the extractor. This did not seem logical because there was a significant distance and, hence, time delay between the interface level measurement and the control valve.
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An insertion flowmeter is specified for a 14-inch pipe. What will be the approximate flow measurement error if the flowmeter is installed in an 18-inch pipe?
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ABOUT SPITZER AND BOYES, LLC
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In addition to over 35 years of experience as an instrument user, consultant, and expert witness, David W Spitzer has written over 10 books and 250 articles about flow measurement, level measurement, instrumentation, and process control. David (with Walt Boyes) is the author of seven Consumer Guides to various industrial flow and level technologies. David teaches his flow measurement seminars in both English and Portuguese.
Spitzer and Boyes, LLC provides engineering, technical writing, training seminars, strategic marketing consulting, distribution consulting, and expert witness services worldwide, and can be contacted at +1.845.623.1830 or www.spitzerandboyes.com.
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ISSN 1538-5280
©2012 Spitzer and Boyes, LLC
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