LIQUID LEVEL SENSOR DEVICE, CONCRETE PRODUCT, AND SUBMERGENCE STATE DETECTION SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a technology capable of detecting a liquid level with a smaller power consumption than a conventional constitution. SOLUTION: This liquid level sensor device for detecting the liquid level includes sensor units comprising a plurality of sensor units arranged respectively on each height determined beforehand, and having each unit circuit wherein an impedance is changed when the liquid level reaches each sensor unit; a circuit formed by connecting the plurality of unit circuits carried by the plurality of sensor units to an internal power source; and the first detection means for detecting the liquid level based on a current flowing in the circuit or on a circuit voltage, changing corresponding to the impedance change. COPYRIGHT: (C)2007,JPO&INPIT