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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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PROFIBUS originated from the early work of the IEC fieldbus standards
committee as a proposal for fieldbus protocol in 1989. PROFIBUS-PA adopted
the well-defined Physical Layer of IEC 61158 part 2 that is identical to
that of FOUNDATIONT Fieldbus H1. The upper layer (H2) for PROFIBUS-PA is PROFIBUS-DP.
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Level measurement systems perform a relatively basic function - they determine
the inventory of a contained material. But selecting a level measurement instrument
is far from simple, especially when one considers the wide variety of performance
statement methodologies users must decipher when evaluating noncontact level gauges.
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There are times when the seemingly mundane comes into focus... "Garden variety"
pressure gauges are often considered commodities due to their relatively low cost in relation
to the overall project. Their quick "off-the-shelf" delivery does not help this image. Yet these
gauges are important to the operation of many processes, such as when pressure gauges are used to
verify and/or manually set process operating parameters.
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ABOUT SPITZER AND BOYES, LLC
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Spitzer and Boyes, LLC sells
Consumer Guides for end-users that contain detailed product information
and analysis about:
We also offer seminars
on these topics at various locations across the United States
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ISSN 1538-5280
©2006 Spitzer and Boyes, LLC
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