Pneumatic gauging circuit

Details Pneumatic gauging circuit Pneumatic gauging circuit

1984-05-07

1985-11-05

Miles, Tim

Measuring and testing

With fluid pressure

Dimension, shape, or size

73 378, G01B 1310

Patent

active

045505926

ABSTRACT:
A bridge type pneumatic circuit, for pneumatic gauging, having an inlet and two branch passageways through which flow of compressed air from an inlet to an outlet of each branch passageway is controlled by an adjustable orifice. One of the outlets is connected to the nozzle, or nozzles, of an air gauge head, such that the pressure of the air flowing past the corresponding adjustable orifice varies as a function of the distance separating the nozzle from the surface, while the other branch passageway is vented to atmosphere through a calibrated orifice to establish a zero reference. The differential pressure between the passageways downstream of the adjustable control orifices is monitored by a differential pressure transducer to provide a control signal to a measurement display instrument. In the alternative, the outlet of the second branch passageway is also connected to the nozzle, or nozzles of an air gauge head, to effectuate differential measurements.

REFERENCES:
patent: 2266566 (1941-12-01), Poole
patent: 2707389 (1955-05-01), Fortier
patent: 2953014 (1960-09-01), Emmons
patent: 3477276 (1969-11-01), Fortier
patent: 3520175 (1970-07-01), Sharp et al.
patent: 3854322 (1974-12-01), Wood et al.
patent: 3948082 (1976-04-01), Zumbach et al.
patent: 4088009 (1978-05-01), Fukuda
Founding, Welding, Production Engineering, Oct. 1976, "The Principles and Applications of Pneumatic Gauging" by V. R. Burrows.

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