| 摘要 |
PROBLEM TO BE SOLVED: To provide a gas alarm for easily grasping a residual allowable stay time in a management region so that the concentration integration amount of a continuously exposable object gas of a person who stays in the management region does not exceed a limit of concentration integration amount about the object gas. SOLUTION: A gas alarm is used so as to be carried by a person who stays in a management region which is threatened to be exposed to object gas having dangerousness or toxicity to a human body, and configured to carry out first processing for calculating the concentration integration amount of object gas concentration with a periodic time interval in each fixed time, and for calculating the current weighted mean value on the basis of a scheduled stay time in the management region and second processing for calculating the residual allowable stay time in the management region corresponding to an allowable integration amount as a difference between a limit concentration integration amount when the person is continuously exposed to the object gas, set on the basis of the scheduled stay time, and the weighted mean value on the basis of the current concentration amount, and to display the allowable stay time at a display part. COPYRIGHT: (C)2008,JPO&INPIT
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