Temperature sensor abnormality detection device and temperature sensor abnormality detection method

A temperature sensor abnormality detection method for detecting abnormalities of a plurality of temperature sensors provided in each of a plurality of tanks in a tank system having the plurality of tanks, comprising:

• by a computer of a temperature sensor abnormality detection device,
• calculating deviations between an average value of temperatures detected by the plurality of temperature sensors and a temperature detected by each of the plurality of temperature sensors;
• identifying a temperature sensor with the largest deviation;
• determining that an abnormality has occurred in the identified temperature sensor when a temperature detected by the identified temperature sensor is a minimum value among the temperatures detected by the plurality of temperature sensors and a deviation of the identified temperature sensor is equal to or greater than a predetermined value;
• and
• determining that an abnormality has occurred in the plurality of temperature sensors other than the identified temperature sensor when a temperature detected by the identified temperature sensor is a maximum value among the temperatures detected by the plurality of temperature sensors.