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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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Fieldbus is a generic term applied to an open or generic network
of automation devices used for factory automation or process control.
However, in this article, the term "fieldbus" is limited to the specialized
fieldbuses for process control.
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Magnetic flowmeters are among the most versatile of flowmeter technologies.
These meters measure liquid velocity, from which the volumetric flow rate is
inferred. The measurement is linear with liquid velocity and exhibits a relatively
large turndown. In addition, the range of accurate flow measurement is relatively
large and easy to change after installation.
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Process switches have been used for years in process plants for sensing flow,
level, pressure, temperature, and position limits to name a few. Some
switches are required by codes, such as when low and high-pressure switches
are used to shut down a boiler when certain pressures are outside of safe
limits. Many systems use valve limit switches to verify valve position
according to the process control strategy.
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ISSN 1538-5280 ©2006 Spitzer and Boyes, LLC
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