Measuring and testing – Volume or rate of flow – Using differential pressure
Patent
1981-03-05
1983-05-24
Birmiel, Howard A.
Measuring and testing
Volume or rate of flow
Using differential pressure
G01F 100
Patent
active
043844928
ABSTRACT:
A differential pressure transmitter having structure for producing an output pneumatic signal from a pneumatic source in relation to the air velocity pressure of air flowing in the passage structure that senses the difference between the total pressure and the static pressure of the air flowing in the passage, and structure for extracting the square root of the air velocity pressure of the air from the pneumatic output signal as the pneumatic output signal is being produced so that the pneumatic output signal is substantially linear with respect to the air velocity of the air flow in the passage whereby the transmitter comprises a linear air velocity transmitter. The structure for extracting the square root comprises a substantially flat cam surface.
REFERENCES:
patent: 1638102 (1927-08-01), Roucka
patent: 2351745 (1944-06-01), Donaldson
patent: 2509078 (1950-05-01), Stover
patent: 2672151 (1954-03-01), Newbold
patent: 2692501 (1954-10-01), Erwood
patent: 2992559 (1961-07-01), Martz et al.
patent: 3444736 (1969-05-01), Stedman
Page 7 of the Operating Manual entitled Operating Manual, "Force Bridge," of Sorteberg Controls Company.
Pages 1 and 2 of the Technical Information Bulletin, T137-55B of the Foxboro Company.
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