Flood sensor, flood warning system and disaster warning system

摘要

PROBLEM TO BE SOLVED: To provide a flood sensor, a flood warning system and a disaster warning system which can be realized easily and at low cost. SOLUTION: The inundation sensor 40 is an inundation sensor for detecting the occurrence of inundation, and is arranged apart from a main electrode 41 having a lower end arranged at a height higher than an installation surface and a main electrode 41. The first to third measurement electrodes 42 to 44 having the lower ends arranged at the first to third water level heights H1 to H3 located above the lower ends of the electrodes 41, and the main electrodes 41 and the first to third electrodes. Based on the detection that an AC voltage generation unit 45 for applying an AC voltage between the measurement electrodes 42 to 44 and a current flowing between the main electrode 41 and the first to third measurement electrodes 42 to 44, A control unit 22 for detecting the occurrence of inundation on the installation surface is provided. [Selection diagram] FIG. 6