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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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Differential pressure flow transmitter performance is affected by process
pressure, ambient temperature, and drift (stability). Process pressure effects
are expressed as a percentage of set span per unit pressure change. As such,
the pressure effects for all of the (hypothetical) differential pressure
transmitters are the same.
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PERIODIC FLOWMETER verification and/or calibration are commonly used to maintain
availability and proper operation of installed flowmeters. However, these approaches
typically detect flowmeter problems after they occur, and usually only after the
flowmeter has a detrimental effect on the process.
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Flowmeter selection is not easy - so expect no silver bullets in this article. I
cannot teach you a cookbook method for finding the "right" flowmeter. But I will
attempt to explain a little bit about what makes specifying flowmeters such a
difficult process.
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ISSN 1538-5280 ©2006 Spitzer and Boyes, LLC
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