Measuring and testing – Liquid level or depth gauge – Immersible electrode type
Reexamination Certificate
2007-08-21
2007-08-21
Williams, Hezron (Department: 2856)
Measuring and testing
Liquid level or depth gauge
Immersible electrode type
Reexamination Certificate
active
10773674
ABSTRACT:
A capacitive fluid level sensor is disclosed that operates without the use of a float, wherein coplanar sensing electrodes disposed onto a dielectric substrate and positioned proximate a dielectric wall of a vessel containing a fluid, form a fringing field capacitance that changes in accordance with changes in the level of the fluid. The electrodes are electrically insulated from the measured fluid. The electrodes are sized and spaced to maximize response of the capacitance to changes in the level of the fluid, while minimizing the effects of the dielectric wall. The sensor is fabricated such that it can be positioned against the outside of a dielectric wall of a vessel, or embedded within a dielectric material. A low permitivity spacer and shield assembly are taught which reduces sensitivity to electric fields external to the vessel. An interdigital comb configuration of the electrodes is also disclosed in which depressions or gaps are formed into the dielectric substrate in an area of spacing of the electrodes.
REFERENCES:
patent: 4201085 (1980-05-01), Larson
patent: 4603581 (1986-08-01), Yamanoue et al.
patent: 5005407 (1991-04-01), Koon
patent: 5227174 (1993-07-01), Konig
patent: 6490920 (2002-12-01), Netzer
West Paul M.
Williams Hezron
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