There are two main types of smoke alarm tech, says Raman Chagger, principal consultant at BRE, the Building Research Establishment. Ionisation-based systems use a tiny amount of radioactive material to charge, or ionise, particles in the air which flow between two small plates. Should smoke interrupt that flow of charged particles, the alarm goes off.
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2.5#楼施工升降机计载重显示失灵， 6人荷载显示0.04吨，天窗电气联锁失效，设备上限位失效。（违反《房屋市政工程生产安全重大事故隐患判定标准（2024版）》第八条第四款，属于重大事故隐患。）