Force-type flowmeter

Details Force-type flowmeter Force-type flowmeter

1976-11-19

1977-10-04

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

System

73228, G01F 128

Patent

active

040517233

ABSTRACT:
A flowmeter capable of accurately measuring and transmitting extremely low flow rates, the meter including a vertically-positioned flow tube having a ferromagnetic ball therein which is subjected to the force of gravity as well as to the drag force imposed by the upward flow of fluid to be metered. Associated with the flow tube is a position sensor which yields a control signal when the ball lies in a detection zone. The ball is also subjected to a magnetic force produced by an electromagnet energized by a current controller governed by the control signal, which force seeks to displace the ball away from the detection zone. The control signal causes the magnet current to pulse and the ball to oscillate in said tube at a frequency which is a function of flow rate, the frequency of the current being indicated to provide a flow rate reading.

REFERENCES:
patent: 3605741 (1971-09-01), Spencer
patent: 3847020 (1974-11-01), Jurschack
patent: 4003255 (1977-01-01), Spencer

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