Measuring and testing – Fluid pressure gauge – Diaphragm
Patent
1993-04-23
1994-09-27
Chilcot, Jr., Richard E.
Measuring and testing
Fluid pressure gauge
Diaphragm
336 30, G01L 910
Patent
active
053498682
ABSTRACT:
In a bridge circuit of a pressure sensor, resistances are connected in series to the impedances of a pressure detection coil and of a dummy coil for differential provided for deforming and non-deforming parts, and the values of the resistances are smaller than the impedances of the coils. The inductance and the internal resistance of the coils are measured under zero pressure and under the highest rating pressure. The resistance connected to the pressure detector coil is determined so that the sensor output sensitivity, represented as a difference of the sensor outputs under zero pressure and under the highest rating pressure, at the highest temperature agrees with that at the lowest temperature. The resistance connected to the dummy coil is determined so that the sensor output, represented as a difference of the sensor outputs under zero pressure, at the highest temperature agrees with that at the lowest temperature.
REFERENCES:
patent: 4170498 (1979-10-01), Jost et al.
patent: 4696192 (1987-09-01), Yamashit et al.
patent: 4936069 (1990-06-01), Hunter et al.
patent: 4938069 (1990-07-01), Shoji et al.
patent: 5165284 (1992-11-01), Shoji et al.
Hase Hiroyuki
Shoji Rihito
Wakamiya Masayuki
Chilcot Jr. Richard E.
Matsushita Electric Industries Co., Ltd.
Oen William L.
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