LIFETIME EVALUATION DEVICE WITH TEMPERATURE HISTORY, AND IRON HEAD TEMPERATURE MEASUREMENT DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a lifetime evaluation device with a temperature history capable of rationally determining the lifetime of a temperature sensor in an iron head temperature measurement device.SOLUTION: A lifetime evaluation device includes: a temperature sensor 201; time measurement means (a timer 207) for measuring a lapsed time for the detection of temperature when the temperature sensor detects a fixed level or more temperature; evaluation value calculation means (an arithmetic part 202) for calculating an evaluation value to be greater as temperature is higher and a time is longer on the basis of both data of the temperature detected by the temperature sensor and the time measured by the time measurement means; integration means (the arithmetic part 202) for calculating an integration value of the evaluation value whenever the temperature sensor detects a fixed level or more temperature; storage means (a storage part 203) for storing by updating an integration value calculated by the integration means; and alarm means (the arithmetic part 202) for generating an alarm signal when the integration value of the evaluation value exceeds a predetermined lifetime value.