Measuring and testing – Fluid pressure gauge – Electrical
Patent
1995-08-31
1997-09-23
Chilcot, Richard
Measuring and testing
Fluid pressure gauge
Electrical
73753, 73724, 73730, G01L 912
Patent
active
056707215
ABSTRACT:
An apparatus for measuring the pressure of a liquid in a container includes a capacitor formed by a pair of electrodes. A charging circuit produces a charging current of constant magnitude. The charging current is used to charge the capacitor to a predetermined voltage. A timing circuit measures the elapsed time between the time at which the charging circuit begins to produce the charging current and the time at which the capacitor has been charged to the predetermined voltage. The timing circuit produces a pulse width modulated signal. The magnitude of the pulse width modulated signal is indicative of the time difference and thus, the pressure within the container.
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SAE Technical Paper Series--910497 Feb. 25-Mar. 1, 1991 "A Capacitive Oil Deterioration Sensor".
Codina George
Murr Donna J.
Ramamoorthy Chandrasekar
Caterpillar Inc.
Chilcot Richard
Felber Joseph L.
Masterson David M.
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