Measuring and testing – Liquid level or depth gauge – Hydrostatic pressure type
Reexamination Certificate
2005-08-23
2005-08-23
Williams, Hezron (Department: 2856)
Measuring and testing
Liquid level or depth gauge
Hydrostatic pressure type
C073S29000R, C073S298000
Reexamination Certificate
active
06931925
ABSTRACT:
The invention relates to a method for determining the current filling level of a liquid, preferably a calibrating, quality control, or cleaning fluid, or waste water, in a container, for example of an analyzer, where an immersion pipe is dipped into the liquid in the container to be filled or drained. The immersion pipe is connected to a pumping device via a tube system. The pressure p in the tube system is measured and increased, starting from the ambient pressure p0, until a first discontinuous pressure change occurs at pressure p1due to the liquid column in the immersion pipe being forced out of the pipe, and/or the pressure p in the tube system is decreased until the liquid column in the immersion pipe reaches a change in cross-section of the immersion pipe, which change is situated above the maximum filling level of the liquid, such that a second discontinuous pressure change occurs at pressure p2due to the liquid column reaching the change in cross-section. The pressure difference between ambient pressure p0and the pressure p1or p2at one of the two pressure discontinuities or the time t1or t2until one of the two pressure discontinuities is reached, is recorded and used to determine the current filling level of the container.
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Huemer Herfried
Ruether Horst
Frank Rodney
Roche Diagnostics Operations Inc.
Roche Diagnostics Operations Inc.
Williams Hezron
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