Measuring and testing – Volume or rate of flow – System
Patent
1980-08-12
1982-09-28
Ruehl, Charles A.
Measuring and testing
Volume or rate of flow
System
7386115, 7386116, 13710119, G01F 158
Patent
active
043511899
ABSTRACT:
A flowmeter head is in the form of side-by-side channels of non-magnetic, electrically insulating material with the channels of very similar size. Sufficient precision of channel size is attained by boring the channels or by using drawn tube of closely controlled size. A radial electrode is provided in each channel, e.g. by drilling a fine hole in the channel wall and sealing a wire in. The electrode arrangement permits an applied magnetic flux to pass through first one channel, then the other. Earth electrodes are provided at the ends of each channel. An earth-loop free connection to a differential amplifier of a flowmeter apparatus is possible with the electrode configuration. The precision of the channel size improves common-mode accuracy and the earth-loop free connection reduces drift and noise.
REFERENCES:
patent: 2637207 (1953-05-01), De Boisblanc
patent: 2685796 (1954-08-01), Romanowski et al.
patent: 2771771 (1956-11-01), Kamp et al.
patent: 3002379 (1961-10-01), Hurley
patent: 3036585 (1962-05-01), Shawhan
patent: 3438385 (1969-04-01), Nogami
patent: 4112515 (1978-09-01), Sandow
Gray and Sanderson-"Electromagnetic Differential Flowmeter," I.E.E. Electronics Letters, vol. 6, No. 7 (1970), pp. 194-196.
Gray John O.
Sanderson Michael L.
National Research Development Corporation
Ruehl Charles A.
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