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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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Other types of variable area flowmeters must be installed vertically. They are commonly referred to as rotameters, but only one actually is. Most armored rotameters are actually operating under the orifice-and-tapered-plug principle. A tapered plug generally of a vee-shape, held in place by a vertical, center-mounted follower, moves up and down in a sharp-edged annular orifice as flow changes. Flow is always in an upward direction, and the height of the plug in relation to the orifice is proportional to the flow rate. The follower is connected (usually by magnetic coupling) to a local indicator, which may be either mechanical or electronic, or even a transmitter.
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About 10 years ago, I was asked to audit the flowmeters used to bill a chemical plant for its steam consumption. In general, hiring a consultant to audit the flowmeters illustrates the importance placed on having accurate measurements that ensure the multimillion-dollar annual steam bill is as accurate as possible.
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Which of the following configurations lend themselves to becoming potentially viable applications of variable speed drives?
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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
©2018 Spitzer and Boyes, LLC
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