| 摘要 |
PROBLEM TO BE SOLVED: To provide an alarm which can be easily installed and which can raise an alarm as quickly and as precisely as possible. SOLUTION: When a single alarm determination threshold is not exceeded in a step S30, the CPU of the alarm determines whether a detection result value given by a detector exceeds a total alarm determination presupposition threshold, and if the value exceeds the total alarm determination presupposition threshold, the CPU of the alarm collects the detection result from each of the other alarms in a group, and counts the number of values exceeding the total alarm determination presupposition threshold in each of the collected detection results. The CPU of the alarm reads out a total alarm determination threshold corresponding to the counted value, by referring to a total alarm determination threshold table in a storage, and raises an alarm when a detection result value given by a detector 12 exceeds the total alarm determination threshold. COPYRIGHT: (C)2008,JPO&INPIT
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