| 摘要 |
PROBLEM TO BE SOLVED: To provide an intrusion detecting device for sufficiently identifying normality/abnormality even in the case of such small displacement volume or intake volume that it is not identifiable by a system for detecting an air pressure difference. SOLUTION: This intrusion detecting device is provided with an exhaust port 2 and an exhaust system 3 for generating a pressure difference inside and outside a building 1, an intake port 4 of the building, an airflow meter or air speed meter 5 arranged in the intake port 4, a comparing means for comparing the value of the airflow meter or air speed meter 5 with a preliminarily decided judgement reference value and an alarm generating means for generating warning when the output of the comparison means is made different from the judgement reference value by a predetermine range or more. COPYRIGHT: (C)2005,JPO&NCIPI
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