摘要 |
PURPOSE:To judge the abnormality of a temperature controller accurately even when a detecting element having high specific-value temperature dependency is used by judging the abnormality after heating or cooling a body to be detected. CONSTITUTION:A control signal ENPOWER for heating the device 1 to be detected is inputted firstly to heat the device 1 to be detected, and the output of the detecting element 2 enters a linear region. When the device is heated up to a specific temperature, a comparator 5 outputs 0, and a gate 7 outputs 0 and a switch circuit turns off to cut off power supply to the device to be detected. Although the element has high specific-value temperature dependency, the judgement of real abnormality is made as far as an output of high-temperature abnormality or heat breaking down is outputted from comparators 3 and 4 when a signal ENERROR is inputted to a gate 9, thereby outputting a signal ERROR. The judgement is made after the temperature of the device 1 to be detected is raised above the specific value, but may be made after the device is cooled. |