Capacitively coupled magnetic flowmeter

Details Capacitively coupled magnetic flowmeter Capacitively coupled magnetic flowmeter

G - Physics

01

F

324/49, 73/69

G01F 1/56 (2006.01) G01F 1/60 (2006.01)

Patent

CA 1211636

Abstract Capacitively coupled magnetic flowmeter A magnetic flowmeter of the capacitively-coupled type includes detection circuitry which responds to low-impedance current signal that is related to the voltage induced at the electrodes by the intersection of the flowing fluid and a time varying magnetic field. An on-line measure of the electrode capaci- tance that is non-interactive with the low-impedance current signal is accomplished by creating a voltage difference between the process fluid and the elec- trodes which causes a current to flow from the elec- trodes proportional to the value of the electrode capacitance as well as the rate of change of the magnetic field. In one embodiment, the primary ele- ment and the detection circuitry are referenced to a different potential than that of the process fluid and the adjacent piping of the flow system. Thus, a direct, on-line measure of this capacitance can be attained in a manner that essentially eliminates stray leakage currents and that foregoes the needs for special shielding requirements such as localized, internal shields around the imbedded electrodes.

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