Measuring and testing – Liquid level or depth gauge – Immersible electrode type
Reexamination Certificate
2007-10-02
2007-10-02
Williams, Hezron (Department: 2856)
Measuring and testing
Liquid level or depth gauge
Immersible electrode type
Reexamination Certificate
active
11246349
ABSTRACT:
A method and apparatus for sensing different levels of liquids in their respective containers in a liquid-consuming and/or producing instrument system. According to a preferred embodiment, an elongated liquid-sensing probe having axially spaced electrodes adapted to sense liquid at multiple levels is arranged in each container of liquid. A controller, e.g. a suitably programmed microprocessor, operates to selectively poll different pairs of electrodes carried by the probe to determine whether or not the polled electrode pairs are immersed in the contained liquid. Preferably, the polling circuit comprises an electronically-controlled resistor that serves to normalize the level-sensing output signal for liquids of different bulk resistivity.
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Echevarria Elgardo
Li William W.
Nguyen Tan
Xin Rongchang
Zuleta Marco
Alter Mitchell E.
Beckman Coulter Inc.
Fitzgerald John
Kurz Warren W.
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