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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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This issue sponsored by KROHNE
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October 2014
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Calibrating flowmeters is complicated by the dynamic nature of steady-state flow. In comparison, consider that a level transmitter can typically be calibrated by adjusting the transmitter with known levels in the tank. Pressure transmitters can be calibrated in the field by developing a known pressure using a dead-weight tester that distributes a weight over an area.
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Two months ago, I described the decision process used in the mid-1980s to apply a Coriolis mass flowmeter in ammonia service operating at a relatively low density and the apprehensions about using this device for this application. Last month, I described the Coriolis mass flowmeter installation that created such a large obstruction to flow that the flowmeter would not pass (even close to) the operating flow.
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A thin concentric orifice plate is installed in a 2" Schedule 40 pipe flowing 0 to 100 liters per minute of a liquid with a specific gravity of 1.00 and a viscosity of 20 cP. The differential-pressure transmitter is calibrated for 0-1,000 mm of water column. What differential pressures are produced by the orifice plate at 25 percent and 50 percent of full-scale flow?
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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
©2014 Spitzer and Boyes, LLC
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