Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Hee-Suk Sul0
In-Tak Lee0
Date of Patent
March 11, 2014
0Patent Application Number
131273100
Date Filed
November 3, 2009
0Patent Citations Received
Patent Primary Examiner
Patent abstract
There is provided a water level sensing apparatus including: a body disposed to be exposed within a liquid tank and having an accommodating space therein; and a capacitance detecting unit accommodated in the accommodating space of the body, wherein the capacitance detecting unit compares an upper side capacitance value and a lower side capacitance value and turns on or off an output signal. Because a changeable reference that the capacitance values of a reference surface and a detected surface of the body are simultaneously changed is used, even if the body comes in contact with moisture or debris, the reference surface and the detected surface are equally affected by the moisture or debris, thus reducing the occurrence of malfunction.
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