Mass flow sensing system

Details Mass flow sensing system Mass flow sensing system

1977-04-25

1978-07-18

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

Proportional

G01F 168

Patent

active

041008014

ABSTRACT:
A mass flow sensor system for measuring the flow rate of a fluid in a sensing tube at diverse angular attitudes. Output signal distortion is minimized by neutralizing the effects of convection forces. The sensing tube is formed as a by-pass coupled to a fluid conduit and includes a loop in the shape of a single-turn helix. Circulation of the fluid through the loop cancels gravity-induced convection forces caused by temperature gradients and significantly reduces sensitivity to attitude change. Heating and temperature-sensing resistor coils are wound around the outer surface of the looped portion of the tube. The heater increases the tube temperature above that of the entering fluid, and the temperature difference between the temperature sensors, corresponding to rate of mass flow, is detected as a voltage output signal generated in an associated bridge circuit.

REFERENCES:
patent: 2586060 (1952-02-01), Kronberger
patent: 2594618 (1952-04-01), Booth, Jr.
patent: 3246523 (1966-04-01), Richard

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