Electromagnetic flowmeter in shielded lines

Details Electromagnetic flowmeter in shielded lines Electromagnetic flowmeter in shielded lines

1980-06-20

1982-11-09

Ruehl, Charles A.

Measuring and testing

Volume or rate of flow

By measuring electrical or magnetic properties

G01F 160

Patent

active

043578357

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.

REFERENCES:
patent: 3491593 (1970-01-01), Bailey
patent: 3783687 (1974-01-01), Mannherz et al.
patent: 3902366 (1975-09-01), Gruner
patent: 3999443 (1976-12-01), Appel et al.
patent: 4206640 (1980-06-01), Suzuki

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