Rotameter with read-out device

Details Rotameter with read-out device Rotameter with read-out device

1990-07-11

1991-05-14

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

Using differential pressure

7386157, G01F 124

Patent

active

050145592

ABSTRACT:
An apparatus for measuring flow rate of fluid comprises a flow passage including a first vertical section with cross sectional area increasing from the lower end to the upper end thereof, and a second vertical section with cross sectional area increasing from the upper end to the lower end thereof; a first and second flow obstructing members respectively disposed in the first and second vertical sections of the flow passage in an unrestrained arrangement wherein the first and second flow obstructing members are tethered to one another by a flexible elongated member disposed in a freely slidable arrangement; and a read-out device indicating the position of the first and/or second flow obstructing members, wherein the drag force exerted by the fluid flow moving through the flow passage in a direction from the first to the second vertical sections of the flow passage moves the combination of the two flow obstructing members in the direction of the fluid flow until the drag force is counter-balanced by the resultant force exerted by the combination of the two flow obstructing members, which resultant force may be the difference in the weight or the difference in the buoyancy between the first and second flow obstructing members and, consequently, flow rate of the fluid is determined from the position of the combination of the two flow obstructing members.

REFERENCES:
Tarshish "Highly Sensitive Rotometer" in Izmeritel Naya Tekhnika, No. 4, 4/65, pp. 39-42.

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