Measuring and testing – Fluid pressure gauge – Photoelectric
Patent
1984-07-09
1985-12-31
Woodiel, Donald O.
Measuring and testing
Fluid pressure gauge
Photoelectric
34 51, 7386175, 250231P, G01L 1306
Patent
active
045613095
ABSTRACT:
A method and apparatus for sensing a pressure differential between two spaces or areas, including a U-shaped length of hollow tubing having an inlet end and an outlet end which permits the free flow of air through the tubing from the higher pressure area to the lower pressure area. A vane element is pivotably mounted on the intermediate portion of the tubing and disposed in the path of an air flow therethrough, whereby the vane element moves in response to the quantity of air flow through the tubing. A photoelectric cell arrangement is provided to sense the movement of the vane element, and to generate a signal which is a function of such movement. This generated signal may be transmitted to a computer, which may then be utilized to control the air flow into or out of one of the two areas to maintain a predetermined desired pressure differential therebetween.
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patent: 3354716 (1967-11-01), Wiebe et al.
patent: 4022061 (1977-05-01), Schendel
patent: 4197657 (1980-04-01), Leino et al.
patent: 4206644 (1980-06-01), Platt
patent: 4439930 (1984-04-01), McMahon, Jr.
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