Measuring and testing – Liquid level or depth gauge – Immersible electrode type
Patent
1994-10-24
1997-03-18
Gutierrez, Diego F. F.
Measuring and testing
Liquid level or depth gauge
Immersible electrode type
324663, G01F 2326, G01R 2726
Patent
active
056112408
ABSTRACT:
A level detector includes a level detecting capacitor, an oscillating circuit, and an amplifying circuit. The level detecting capacitor includes a pair of continuously extended electrodes separated by a predetermined distance and disposed at a predetermined position in a container adapted for accommodating a dielectric fluid having levels which are to be detected therein. The oscillating circuit is adapted to apply an alternating voltage of a constant frequency to the level detecting capacitor by way of an impedance element adapted to provide signal voltages. The amplifying circuit is adapted to amplify voltage drops at the impedance element so as to output a signal corresponding to the level of the dielectric fluid. Thus, the level detector can output signal voltages of high linearity and dependant on the fluid level variations using a simple circuit arrangement.
REFERENCES:
patent: 3777257 (1973-12-01), Geisselmann
patent: 4555941 (1985-12-01), Fathauer et al.
patent: 4806847 (1989-02-01), Atherton et al.
patent: 4820973 (1989-04-01), Alvarez
patent: 4841227 (1989-06-01), Maier
patent: 4875497 (1989-10-01), Worthington
patent: 5051921 (1991-09-01), Paglione
patent: 5088325 (1992-02-01), Eichberger et al.
patent: 5156047 (1992-10-01), Tuma et al.
Carmichael, J.M. et al., "Liquid Level Detector," IBM Technical Disclosure Bulletin, vol. 16, No. 3, p. 775 (Aug. 1973).
Beam Electronics Company Limited
Gutierrez Diego F. F.
Toyota Tsusho Corporation
Toyotsu S.K. Company Limited
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