Measuring and testing – Liquid level or depth gauge – Immersible electrode type
Reexamination Certificate
2005-08-30
2005-08-30
Williams, Hezron (Department: 2856)
Measuring and testing
Liquid level or depth gauge
Immersible electrode type
C073S29000R, C361S310000
Reexamination Certificate
active
06935173
ABSTRACT:
A liquid level sensor includes a housing with circuitry provided therein. An inner and outer tube extend from the housing. The inner tube is positioned within a hollow center of the outer tube to form a coaxial configuration. A slot extends through the wall of the outer tube into the hollow center of the outer tube. The slot extends essentially the entire length of the outer tube. The circuitry, outer tube, and inner tube form a capacitive circuit to measure liquid. The slot allows the liquid to flow more easily into the hollow center of the outer tube and between the inner tube and outer tube to allow the sensor to provide accurate measurements with many types of fluids. The circuitry generates a pulse width modular output which is sent to a gauge to provide a visual representation of the level of the fluid in the container. By providing the pulse width modular output signal to the gauge, the sensor of the present invention can operate as a two-wire system, thereby mimicking a passive signal wire system, allowing the sensor to be a drop-in replacement for most prior art sensors.
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Doyle Shawn P.
Snyder, Jr. Andrew K.
Stehman Nathan A.
Barley Snyder
Frank Rodney
Maxima Technologies & Systems, Inc.
Williams Hezron
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