Measuring and testing – Fluid pressure gauge – Diaphragm
Patent
1984-11-30
1987-06-09
Woodiel, Donald O.
Measuring and testing
Fluid pressure gauge
Diaphragm
73714, 200 83P, 336 30, 331 65, G01L 708, G01L 910
Patent
active
046711163
ABSTRACT:
A pressure transducer of the type providing a continuous electrical output signal indicative of the variation in sensed pressure having a metallic preferably aluminum armature attached for movement with a resilient pressure responsive diaphragm. A resonant circuit includes a coil disposed adjacent the armature and an oscillator provides current flow in the coil which generates eddy currents in the armature; and, movement of the diaphragm and armature causes the eddy currents therein to alter the effective inductive reactance of the coil and shift the frequency of resonance of the circuit. Circuit means are provided to emit an output signal indicative of the frequency shift for enabling a continuous determination to be made of the sensed pressure on the diaphragm. An auxiliary snap-action switch is provided remotely from the diaphragm and is actuated by a non-metallic rod from the armature passing through the central region of the coil. The circuitry is preferably mounted on a p.c. board disposed to have the switch rod pass therethrough.
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Creed Brian T.
Glennon Thomas F.
Sokalski Robert G.
Walsh William J.
Eaton Corporation
Johnston R. A.
Rowe D. A.
Woodiel Donald O.
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