| 摘要 |
PURPOSE:To accurately know an abnormality generating time later, by storing and holding the time of a clock when the output of a sensor exceeds a definite value. CONSTITUTION:The outputs of an oxygen sensor 1, a smoke sensor 2 and a temp. sensor 3 are supplied to a data processing circuit 5 through A/D converter circuits 4, 7, 9 and compared with reference voltage by comparators 6, 8, 10. The outputs of the comparators 6, 8, 10 are supplied to the data processing circuit 5 through an OR gate 19. When abnormality is generated, the number of the sensor where abnormal voltage is generated is written in a memory 5a and a buzzer 23 is generated and the generation of abnormality is printed out by a printer 24. Further, the measurement of the time of a digital clock 21 is stopped and, on and after, the display of the digital clock 21 continuously shows the generation time of abnormality.
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