DX-DN数字对讲系统现有的防爆用户话站是ⅡB级,虽然可以适用于冶金行业绝大多数的爆炸性危险场所,但是不能在存在氢气、乙炔等ⅡC级爆炸性气体的场所使用。文章从结构设计和电路设计两个方面详细说明了该话站的具体设计方案,并给出了关键的设计参数和生产工艺要求。经南阳国家防爆电气产品质量监督检测中心进行检测证明,该话站在保证频响、非线性失真、输出功率、失真度等电性能指标,并实现单呼、组呼、广播呼叫等功能的基础之上,防爆性能完全符合国家标准规定。该话站取得国家电气设备防爆合格证,防爆标志为ExdibⅡCT6,适用于工厂存在ⅡA、ⅡB、ⅡC类,T1~T6组可燃性气体、蒸汽与空气混合形成的爆炸危险1区或2区场所使用。 DX-DN digital intercom system existing user station explosion-proof is Ⅱ B level, although it can be applied to the vast majority of the explosive in the metallurgical industry dangerous places, but not in the presence of hydrogen, acetylene and other Ⅱ C explosive gas atmospheres used. The article elaborates the concrete design scheme of the station from two aspects of structural design and circuit design, and gives the key design parameters and production process requirements. After Nanyang National Explosion-proof Electrical Products Quality Supervision and Testing Center for testing proved that the station to ensure the frequency response, nonlinear distortion, output power, distortion and other electrical performance indicators, and to achieve single call, group call, broadcast calls and other functions based Above, explosion-proof performance in full compliance with national standards. The station obtained the national electrical equipment explosion-proof certification, explosion-proof mark Exdib Ⅱ CT6, for the existence of the factory Ⅱ A, Ⅱ B, Ⅱ C categories, T1 ~ T6 combustible gas, steam and air mixture of explosion hazard zone 1 or 2 .