Electromagnetic flowmeter in shielded lines
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United States of America Patent
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-
Nov 9, 1982
Grant Date -
N/A
app pub date -
Jun 20, 1980
filing date -
Jun 20, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An electromagnetic flowmeter in which the fluid whose flow rate is to be measured is conducted through the flow tube of a primary provided with a pair of diametrically-opposed electrodes to intercept a magnetic field established by an electromagnet whose coil is excited by a current having a rectangular waveform whose frequency is low relative to that of a commercial a-c power line. The electrodes of the primary are connected through a transmission line to the input amplifiers of a secondary, the transmission line being constituted by a pair of shielded cables each including an inner line connecting an electrode to the input of a respective amplifier and an outer shield connected to the output of the amplifier, the cables being surrounded by a common outer shield.
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