Measuring and testing – Fluid pressure gauge – Null balance type
Patent
1982-11-02
1985-05-21
Woodiel, Donald O.
Measuring and testing
Fluid pressure gauge
Null balance type
73706, 73716, G01N 3324
Patent
active
045178429
ABSTRACT:
A fluid pressure transducer of the null balance type in which a fluid whose pressure is being sensed acts against one face of a diaphragm and a balancing control fluid acts against the opposite face. Control fluid pressure is uniformly distributed against the control face of the diaphragm by a porous element, preferably made of a sintered material. Movement or displacement of the diaphragm opens a sensing element and may be controlled by use of a similar pressure distributing porous element placed on the sensing side. The volume defined between the two porous elements limits maximum diaphragm travel and displacement. Transducers made according to the invention have high sensitivity. The transducers are particularly well adapted for measurement of pore pressure in earth fills or natural geological environments.
REFERENCES:
patent: 1121105 (1914-12-01), Karlson
patent: 2147031 (1939-02-01), Hastings
patent: 3365949 (1968-01-01), Robinson
patent: 3388598 (1968-06-01), Hall
patent: 3456509 (1969-07-01), Thordarson
patent: 3574284 (1971-04-01), Thordarson
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Slope Indicator Co. publication "Pore Pressure System" (560 Series).
Slope Indicator Co. publication "Pore Pressure Measurement System".
PMC publication "Tank Level Transmitter", (Mar. 1975).
Harris Richard K.
McCutcheon Hugh W.
Twomey James R.
Garrison David L.
Kovalick Vincent P.
Slope Indicator Co.
Smith Ford E.
Woodiel Donald O.
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