Measuring and testing – Fluid pressure gauge – Diaphragm
Patent
1985-01-29
1987-05-05
Woodiel, Donald O.
Measuring and testing
Fluid pressure gauge
Diaphragm
29157R, 29454, 29602R, 73 73, 73784, 336 30, G01L 708, G01L 910
Patent
active
046622268
ABSTRACT:
A pressure-measuring transducer device for transforming a change of tested pressure into a change of output signal frequency. Variable reluctance sensing elements and an FM IC block are assembled together in a base. The transducer device can have a variety of configurations and external forms and is sturdy and reliable, tightly sealed, interference resistant, and adapted for use in measuring dynamic and static pressures of different mediums. The pressure transducer has a piston type double film, and the base is made of aluminum alloy and is "honeycombed". The specific gravity is approximately equal to that of soil. It is adapted for measuring soil pressure or boundary soil pressure of reinforced concrete structure and pressure of loose solid substances. An alternate embodiment is used for measuring pore pressure in soil. Several forms of filtering devices are provided. A liquid pressure transducer can be used for measuring liquid pressure in liquid and for measuring positive or negative pressure in gas, if the filtering device is removed.
REFERENCES:
patent: 2683989 (1954-07-01), Clark
patent: 4102209 (1978-07-01), Brahm
patent: 4149422 (1979-04-01), Olsen et al.
patent: 4409816 (1983-10-01), Yamaguchi et al.
patent: 4424705 (1984-01-01), Hattori et al.
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