Method and apparatus for detecting phase boundaries and correspondingly equipped laboratory device
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United States of America Patent
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May 10, 2016
Grant Date -
Sep 27, 2012
app pub date -
Dec 22, 2010
filing date -
Dec 30, 2009
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Abstract
A device for detecting a phase boundary in a liquid tank a sensor that can be advanced in the direction of the phase boundary in the liquid tank. A circuit processes an output signal of the sensor to detect a change in capacitance and has a first channel with a first filter module to filter out a first signal having a short pulse width from the output signal and a second channel having a second filter module to filter out a second signal having a greater pulse width from the output signal. A controller module with comparator module determines whether the first signal reaches a first threshold value and a processing module determines whether the second signal meets predefined second signal criteria.
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