| 摘要 |
PURPOSE:To exclude the effect of the thermal decomposition temp. of a reactive substance restricting monitor temp. and to perform the stages systematization of monitor temp., by using a hot melt material having m.p. lower than that of an isolation substance collectively enclosing the reactive substance. CONSTITUTION:A hot melt material 5 for integrating a reactive substance 1 consisting of a granular reducing agent 2 and a granular oxidizing agent 3 both of which have coating layers 4A, 4B formed thereto has m.p. lower than that of an isolation substance 4. When a thermometric element is mounted in the vicinity of the temp. abnormality generated part of a large current conductor, the reducing agent 2 melts at first with the rising in the temp. of the conductor and the oxidizing agent 3 is further melted to develop a mixed and contacted stand-by state. As the isolation substance 4 prohibiting this mixed and contacted state, a predetermined substance having m.p. equal to or more than that of the oxidizing agent 3 is used. By this method, the thermometric element having the m.p. of the substance as the monitor temp. of temp. abnormality is obtained. When the temp. of the substance 4 reaches predetermined temp., the coating layers 4A, 4B are melted to lose isolation function and temp. abruptly rises by the heat of reaction due to the mixed and contacted state and a thermal decomposition product becomes vapor which is turn becomes fine particulate soot by cooling.
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