BS EN ISO 80079-37-2016 爆炸性环境.爆炸性环境用非电气设备.结构安全"c"型,火源控制"b"型,液体浸透"k"型非电气型防护设备
Explosive atmospheres. Non-electrical equipment for explosive atmospheres. Non electrical type of protection constructional safety “c”, control of ignition source “b”, liquid immersion “k”