| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an alarm capable of leaving an alarm history which can analyze how much a COHb concentration is raised actually. <P>SOLUTION: A CPU 12A starts the integration of an inverse-time product Σ(1/T) when a CO concentration detected by a gas sensor 10 reaches 100 ppm, determines that COHb reaches 20% when the integrated inverse-time product Σ(1/T) exceeds 1, and controls a sound alarm output circuit 14 to generate an alarm to report the effect. The CPU 12A releases the alarm when the CO concentration detected by the gas sensor 10 is below 100 ppm during the generation of the alarm. Furthermore, the CPU 12A stores an alarm release time between the start of the integration of the inverse-time product Σ(1/T) and the release of the alarm and an average value of the CO concentration detected by the gas sensor 10 during a period between the start of the integration and the release of the alarm in an EEPROM 15 as the alarm history. <P>COPYRIGHT: (C)2011,JPO&INPIT |
