Pneumatic transmitter for variable area flowmeter

Measuring and testing – With fluid pressure – Dimension – shape – or size

Patent

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Details

73209, G01B 1316, G01F 124

Patent

active

040193691

ABSTRACT:
A variable-area flowmeter system adapted to produce a pneumatic output indication that is linearly proportional to flow rate. The primary of the system includes a float contained in a variable area tube through which flows the fluid to be metered, the float being raised or lowered in the tube as a function of flow rate. A bar magnet is physically coupled to the float and moves axially therewith. The secondary of the system includes a rotatable follower magnet magnetically coupled to the bar magnet to convert the axial movement into rotary motion and an edge-profiled input disc mounted on the shaft of the follower magnet whereby the disc rotates in a direction and to an extent depending on flow rate. The profile is designed to afford a linear relationship between input rotation and output pressure. Associated with the profiled disc is an edge sensor which pneumatically senses the profile of the disc to provide a pneumatic ouput signal proportional to flow rate, the sensor being constituted by an air jet nozzle and a jet collector spaced therefrom to define a gap within which the edge of the disc is inserted to vary the collected pressure in accordance with the profile. The jet nozzle is cocked relative to the plane of the disc to counteract the tendency of the jet stream to rotate the disc.

REFERENCES:
patent: 3315523 (1967-04-01), Conkling
patent: 3416358 (1968-12-01), Davis et al.
patent: 3491784 (1970-01-01), Lilly

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