IC693CPU351厦门光沃自动化设备有限公司
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IC693CPU351仪表防爆的原理 
危险场所危险性划分：  
   爆炸性物质 区域定义 中国标准 北美标准 
气体(CLASS Ⅰ)  在正常情况下 , 爆炸性气体混合物连续或长时间存在的场所 0 区 Div.1  
在正常情况下爆炸性气体混合物有可能出现的场所 1 区 
在正常情况下爆炸性气体混合物不可能出现 , 仅仅在不正常情况下 , 偶尔或短时间出现的场所 2 区 Div.2  
粉尘或纤维(CLASS Ⅱ/Ⅲ） 在正常情况下 , 爆炸性粉尘或可燃纤维与空气的混合物可能连续 , 短时间频繁地出现或长时间存在的场所 10 区 Div.1  
在正常情况下 , 爆炸性粉尘或可燃纤维与空气的混合物不能出现 , 仅仅在不正常情况下 , 偶尔或短时间出现的场所 11 区 Div.2  
防爆方法对危险场所的适用性：  
序号 防爆型式 代号 国家标准 防爆措施 适用区域 
1  隔爆型 d  GB3836.2  隔离存在的点火源 Zone1,Zone2  
2  增安型 e  GB3836.3  设法防止产生点火源 Zone1,Zone2  
3  本安型 ia  GB3836.4  限制点火源的能量 Zone0-2  
本安型 ib  GB3836.4  限制点火源的能量 Zone1,Zone2  
4  正压型 p  GB3836.5  危险物质与点火源隔开 Zone1,Zone2  
5  充油型 o  GB3836.6  危险物质与点火源隔开 Zone1,Zone2  
6  充砂型 q  GB3836.7  危险物质与点火源隔开 Zone1,Zone2  
7  无火花型 n  GB3836.8  设法防止产生点火源 Zone2  
8  浇封型 m  GB3836.9  设法防止产生点火源 Zone1,Zone2  
9  气密型 h  GB3836.10  设法防止产生点火源 Zone1,Zone2  

IC693CPU351

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