PROBLEM TO BE SOLVED: To provide a corrosion sensor with which it is possible to measure a corrosion rate with high accuracy while using an external power supply in order to enable long-term corrosion measurement.;SOLUTION: Provided is a corrosion sensor 1 comprising a corrosion sensor board 10 and an electrode 20 connected to the corrosion sensor board 10 and immersed in the water to be inspected. The corrosion sensor board 10 comprises a charging battery 12, a relay circuit 13 for connecting the corrosion sensor board 10 and an external power supply 5, and a control unit 14 for controlling the relay circuit 13. During measurement by the corrosion sensor 1, the control unit 14 cuts off connection between the corrosion sensor board 10 and the external power supply 5 by the relay circuit 13 and carries out measurement of a corrosion rate using the charging battery 12; during standby of the corrosion sensor 1, the control unit 14 connects the corrosion sensor board 10 and the external power supply 5 by the relay circuit 13 in order for charging of the charging battery 12.;SELECTED DRAWING: Figure 4;COPYRIGHT: (C)2019,JPO&INPIT
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