Electromagnetic flowmeter deriving power from signalling loop current
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United States of America Patent
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-
Aug 7, 2001
Grant Date -
N/A
app pub date -
Dec 18, 1998
filing date -
Dec 19, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An improvement over conventional electromagnetic flowmeters which signal a measure of flow rate by controlling the current in a current signalling loop (also known as a sensing loop) and in which power for the flowmeter is derived from the current in the signalling/sensing loop. Conventional electromagnetic flowmeters use a standard current range (typically 4-20 mA), in which zero flow is indicated by controlling the current in the loop to a minimum predeterimened value and maximum flow is indicated by controlling the current to a maximum predetermined value. In the improved flowmeter of the invention, minimum flow is signalled by maximum current in the signalling/sensing loop and maximum flow is signalled by minimum current. This has been found to enable improved accuracy to be obtained at low flow rates without requiring complex flowmeter circuitry.
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