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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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At a flow lab, they run a known quantity of fluid (almost always water) through the metering element, and compare the reading of the meter with the actual throughput of the lab. The difference, if any, is the inaccuracy of the meter. Adjusting the meter's calibration factor (sometimes known as 'k-factor') to account for this inaccuracy is the process of calibrating the meter.
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The physical properties, operating conditions and operating constraints of a combustion air flowmeter for an incinerator were discussed last month. Combustion air flow measurements were required for flows of 15 to 700 units and the flowmeter had to measure zero flow under reverse flow conditions lest the fumes overpower the combustion air fan and escape to the atmosphere.
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An orifice plate flow element has shut-off valves located at each pressure tap. Its differential pressure transmitter has a three-valve manifold. The transmitter is to be removed for shop calibration. In what sequence should the valves be opened and closed to safely remove the transmitter and manifold?
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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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