Oscillating-ball flowmeter

Details Oscillating-ball flowmeter Oscillating-ball flowmeter

1978-06-29

1979-09-11

Ruehl, Charles A.

Measuring and testing

Volume or rate of flow

System

G01F 128

Patent

active

041671155

ABSTRACT:
An oscillating-ball flowmeter for accurately measuring and transmitting extremely low flow rates. The meter includes a vertically-positioned flow tube having a ferromagnetic ball therein which is subjected to the force of gravity as well as the drag force imposed thereon by the upward flow of fluid being metered. An electro-optical sensor associated with the tube produces a control signal when the ball is intercepted by a light beam. This signal activates a magnet driver which energizes an electromagnet positioned above the sensing beam to generate a magnetic force that lifts the ball upwardly away from the light beam. The driver is thereafter de-activated to cause the lifted ball to fall and again intercept the light beam to re-activate the driver to repeat the cycle. As a consequence, the ball is caused to oscillate in the tube in an oscillation zone and the magnet current is pulsed at a frequency which is an inverse function of flow rate and is indicative thereof, the resultant signal being converted into a current signal directly proportional to flow rate.

REFERENCES:
patent: 3739636 (1973-06-01), Versaci et al.
patent: 4051723 (1977-10-01), Head et al.

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