Gauge system for measuring air flow in ducts

Measuring and testing – Volume or rate of flow – Thermal type

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Details

73212, G01G 134

Patent

active

039370828

ABSTRACT:
For use in measuring air velocity and pressure changes in a duct, a gauging system comprising a gauge including a vertically extending transparent tube within which a ball moves to a position corresponding to the pressure in the tube above and below the ball, a velocity scale and a pressure scale extending alongside the tube and increasing from their lower end to their upper end, a vertically extending transparent shell enclosing the tube, and one or more rigid tubes for connecting the lower end of the gauge tube to the interior of the duct to read total pressure or static pressure and a flexible tube for connecting the upper end of the shell to the interior of the duct to read static pressure. The rigid tube or tubes provide a distal end portion with an open end arranged to be pointed upstream or opposite to the direction of flow of air through the duct to read total pressure including velocity pressure and static pressure while the flexible tube provides a distal end portion with an open end and arranged to read the static pressure. The static pressure, therefore, pushes downwardly upon the ball while the total pressure pushes upwardly on the ball such that the static pressure is subtracted from the total pressure leaving velocity pressure which corresponds to velocity. The gauging system can simply be carried into a walk-in duct to read the air velocity therein without drilling or cutting access holes in the duct wall. The gauging system can be used to read pressure drop or increase across an item such as a coil or fan in a duct.

REFERENCES:
patent: 2003474 (1935-06-01), Schweitzer
patent: 2009427 (1935-07-01), Bentzel
patent: 2706409 (1955-04-01), Preston
patent: 3020757 (1962-02-01), Parish
patent: 3408865 (1968-11-01), Chenault
patent: 3581565 (1971-06-01), Dieterich
patent: 3603148 (1971-09-01), Rikuta
patent: 3693441 (1972-09-01), Obstfelder

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