在石油化工生产及储运过程中，常有由于泄漏的可燃气体遇有明火而引发的火灾或爆炸事故的发生。
During the production, storage and transportation of the petrochemicals, fires and explosions often happen because the leakage combustible gas meets the open fire.
爆炸极限是评定可燃气体火灾爆炸危险的主要指标之一。
The explosive limit is one of main index to judge explosion fatalness of fuel gases.
FGS接受来自现场的火灾、可燃气体探头的检测信号及手动报警信号，启动警报系统，同时将火灾信号送至消防中心。
FGS will alarm when it receive the field alarm signals from fire, gas sensors and manual call points, At the same time, the fire alarm signals will be sent to central fire station.
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