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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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HART was an interim development in the late 1980's stemming from the original SP50 work on Fieldbus for suppliers to retain the 4-20mA analog transmission and conduct a digital data exchange in the same two-wire loop. Technology at the time restricted the data rate to 1200 bps when the analog signal was present.
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Sometimes we "know" things that are not true.
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There are times when there is no flowmeter installed, but it is necessary to determine the flow through a pipe.
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