Flow sensor

Details Flow sensor Flow sensor

1991-01-04

1993-11-09

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

Thermal type

7320422, G01F 168

Patent

active

052592430

ABSTRACT:
A flow meter has an elongate housing with a fluid inlet, a fluid outlet and an axial passage therebetween. The fluid passage contains a flow sensor assembly operationally connected in parallel to a flow splitter section. The flow sensor assembly has a flow tube forming an axial passage therethrough and the flow tube has a thermally diffusive sensor region. An upstream resistance thermometer and a downstream resistance thermometer are in thermal contact with the sensor region. The sensor region can additionally contain an electrically insulating coating on its outside surface and resistance thermometers formed by winding a single layer of a fine, uninsulated wire around its outside surface. The sensor assembly can be surrounded by inner and outer housings made of electrically and thermally conductive material connected to the flow tube near the ends of the sensor region and grounded to a printed circuit board.

REFERENCES:
patent: 2525197 (1950-10-01), Beams
patent: 2594613 (1952-04-01), Booth
patent: 2729976 (1956-01-01), Laub
patent: 2832018 (1958-04-01), Laub
patent: 3650151 (1972-03-01), Drexel
patent: 4519246 (1985-05-01), Hartemink
patent: 4616505 (1986-10-01), Jouwsma
patent: 4686856 (1987-08-01), Varva et al.
"Les Debitmetres Thermiques et Leurs Emplois", Jacque Mercier (Oct. 1969).
"A Sensitive Recording Calorimetric Mass Flowmeter", A. F. Brown and H. Kronberger.

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