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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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The problem with measuring the flow of powdered cement in a pneumatic conveyor tube is that the mass per unit volume is small. You cannot use any sort of densitometer to give you a density value to multiply flow by. The differential density is too small to see with any density measuring device, except an optical particle counter which tend to get quite expensive in these applications.
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Every now and then, a published article or internet discussion provides insight into what is really going on. Often these articles entail trying to technically defend the technically indefensible. For example, every 10 years or so, I am asked to review an article about variable speed drives that selectively applies the Affinity Laws to incorrectly calculate energy savings.
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Which of the following can be used as a flow calibration technique?
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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
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