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     爆(bao)炸(zha)三要素：防爆(bao)咨詢(xun)點燃源(yuan)（電(dian)(dian)(dian)火(huo)花(hua)、熱(re)表面）、爆(bao)炸(zha)性物(wu)質（氣(qi)體、粉塵）、空氣(qi)（氧氣(qi)）。防爆(bao)只有爆(bao)炸(zha)性物(wu)質濃度處于極限(xian)(xian)范(fan)圍內（即爆(bao)炸(zha)下(xia)限(xian)(xian)與爆(bao)炸(zha)上(shang)(shang)(shang)(shang)限(xian)(xian)之間）才能產生(sheng)爆(bao)炸(zha)。甲烷：上(shang)(shang)(shang)(shang)15%，下(xia)5%；丙烷：上(shang)(shang)(shang)(shang)9.5%，下(xia)2.1%；乙烯：上(shang)(shang)(shang)(shang)34%，下(xia)2.7%；氫(qing)氣(qi)：上(shang)(shang)(shang)(shang)75.6%，下(xia)4%；乙炔：上(shang)(shang)(shang)(shang)82%，下(xia)1.5%。點燃源(yuan)：電(dian)(dian)(dian)氣(qi)與非(fei)電(dian)(dian)(dian)氣(qi)設備。電(dian)(dian)(dian)火(huo)花(hua)、熱(re)表面、電(dian)(dian)(dian)弧(hu)、無(wu)線電(dian)(dian)(dian)電(dian)(dian)(dian)磁波(bo)輻射；摩擦火(huo)花(hua)、熱(re)表面、靜(jing)電(dian)(dian)(dian)、光輻射等。

       這里可以將射(she)頻源（IIB 3.5W，IIC 2W）、激光（150mW/20 Mw/mm2）、超聲波(bo)（0.1W/ mm2）插入說明。