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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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In solids applications, material entering and leaving the vessel affect the solid/gas interface. As such, this interface is typically not horizontal, so a single level measurement may not be representative of the amount of material in the vessel.
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GIGO means "garbage in, garbage out." This phrase applies in industrial automation because using faulty measurements can fool even the best control system. One remedy that can help avoid a GIGO scenario is to understand the measurement technique and its limitations to the extent that its application can be reasonably evaluated. Differential pressure level measurement is one of those key measurements you need to understand to avoid the dreaded GIGO.
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The accuracy of an orifice plate differential pressure flowmeter that is fabricated and installed per applicable standards can be on the order of 0.60 percent of rate. The stated accuracy of differential pressure transmitters is usually a few times lower, so its contribution to measurement accuracy is neglected in many applications.
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ISSN 1538-5280 ©2011 Spitzer and Boyes, LLC
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