| 摘要 |
PURPOSE: A harmful gas alarm apparatus is provided to prevent suffocation accidents by ringing warning tone when the concentration of harmful gas generated inside a manhole exceeds a predetermined value. CONSTITUTION: A harmful gas alarm apparatus(100) comprises a power switch(110), a gas sensor(120), and a data transmission part(130). The power switch comprises a light sensor(111). The light sensor senses light according to opening and closing of a manhole cover(10). The data transmission part is attached to the top of housing(20) for smooth data transmission. The data transmission part receives a concentration value of measured harmful gas and transmits it to outside. |
