| 摘要 |
PROBLEM TO BE SOLVED: To provide a gas alarm unit and a gas alarming method, which make alarms less irritating.SOLUTION: A high concentration warning level W2, which is higher than a warning level W1, is set together with a high concentration warning clear level WC2 which is higher than a warning clear level WC1. An alarm triggered by a temporary increase in gas concentration to a high level is quickly turned off by configuring an alarm unit such that an alarm is turned off when gas concentration that has been determined to be the high concentration warning level or higher decreases to the high concentration warning clear level or lower.SELECTED DRAWING: Figure 2 |
