Measuring and testing – Fluid pressure gauge – Diaphragm
Patent
1990-09-19
1992-02-25
Woodiel, Donald O.
Measuring and testing
Fluid pressure gauge
Diaphragm
73724, 361283, G01L 708, G01L 912
Patent
active
050902466
ABSTRACT:
A capacitance elastomeric pressure sensor includes top and bottom mounting plates arranged to support a pair of electrode layers. The first electrode layer is supported on the upper surface of a dielectric disc held by an upper mounting plate. The second electrode layer is located beneath the disc and includes a conductive elastomeric layer overlying an elastomeric support layer. In the preferred embodiment, the elastomer is a silicone elastomer and the conductive layer is formed by admixing a conductive carbon powder with the silicone. The sensor is particularly effective in sensing pressure changes in this low range, e.g. 0-1 inch of water. In the most preferred embodiment the elastomeric layer is prestrained for temperature compensation.
REFERENCES:
patent: 3814998 (1974-06-01), Thoma et al.
patent: 3943915 (1976-03-01), Severson
patent: 4152748 (1979-05-01), Arkans
patent: 4168517 (1979-09-01), Lee
patent: 4177680 (1979-12-01), Coleman
patent: 4852443 (1989-08-01), Duncon et al.
Barootian Arthur
Colla Jeannine O.
Froehling Paul H.
Klein Carl F.
Oman Gary F.
Johnson Service Corp.
Woodiel Donald O.
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