| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an alarm capable of rapidly analyzing the trouble after the occurrence of it by judging a trouble reason. <P>SOLUTION: A CPU 10a turns on a selector switch SW1 to charge a CO sensor 1 and subsequently turns off the selector switch SW1 to discharge the CO sensor 1. The CPU 10a detects the trouble of the CO sensor 1 on the basis of a discharge current flowing when the CO sensor 1 is discharged and, when the charge current flowing through the CO sensor 1 during the charge of the CO sensor 1 from the voltage signal from a current/voltage conversion circuit 40 is regarded as 0, disconnection or waterless trouble is judged and, when the current flowing through the input resistor of the current/voltage conversion circuit 40 is regarded as 0, short-circuit trouble is judged. <P>COPYRIGHT: (C)2009,JPO&INPIT |
