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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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The initial ANSI/ISA 50.02 standard called for Fieldbus to have two-level
architecture. The lower level (H1) provided the highest practical speed for an
intrinsically safe environment while supplying power to the field devices. The
upper level (H2) was intended to interconnect the H1 segments and aggregate the
data for distribution to and from higher level systems.
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Flow meters are often taken for granted because they are installed and "work" most of the
time. What is often meant by "work" is that moving a valve to change the flow rate
seems to change the flow measurement appropriately. Notice that the measure of success is of a subjective
nature in that flow measurement accuracy is not even mentioned.
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Some years ago, I was asked to look into the operation of a new
orifice plate flowmeter installation in a chemical plant where two
gases were being mixed prior to being reacted. The problem cited was
that the gases were not reacting properly and the plant surmised that
the gases were not being added in the proper amounts to achieve a good
and complete reaction.
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ISSN 1538-5280
©2006 Spitzer and Boyes, LLC
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