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2、ontrol experts KINGWAYS CONTROL The process control experts KINGWAYS CONTROL The process control experts KINGWAYS CONTROL The process control experts KINGWAYS CONTROL The process control experts KINGWAYS CONTROL The process control experts KINGWAYS CONTROL The process control experts KINGWAYS CONTRO
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4、ROL The process control experts KINGWAYS CONTROL The process control experts 限能电路限能电路放大器放大器保护电路保护电路信号变送信号变送主变送器主变送器保险丝保险丝输出输出电源电源230Vac电路隔离电路隔离KINGWAYS CONTROL The process control experts 购货成本低购货成本低 安装空间小安装空间小 简单可靠简单可靠 低安装成本低安装成本 输入输入/输出和电源隔离输出和电源隔离 不需要隔离接地不需要隔离接地 Full voltage available to field dev
5、ices 标准信号输出标准信号输出(4-20mA)高共模电压高共模电压 高安装成本高安装成本 需要隔离接地需要隔离接地危险区仪表必须与地隔离危险区仪表必须与地隔离 安全栅压降安全栅压降 齐纳泄漏电流导入误差齐纳泄漏电流导入误差 安全和功能检测困难安全和功能检测困难 低共模电压低共模电压 价格高价格高KINGWAYS CONTROL The process control experts KINGWAYS CONTROL The process control experts 外外 壳壳 防防 护护 等等 级级（IP）代代 码码（BS EN60529;1992)0 无防护无防护 1 固体异物直径大于固体异物直径大于50mm 2 固体异物直径大于固体异物直径大于12mm mm mm 5 防尘防尘 6 尘密尘密 0 无防护无防护 1 垂直滴水垂直滴水 2 倾角倾角7590滴水滴水 3 淋水淋水 4 溅水溅水 5 喷水喷水 6 猛烈喷水猛烈喷水 7 短时间浸水短时间浸水 8 连续浸水连续浸水KINGWAYS CONTROL The process control experts IP防护等级防护等级 Vs.NEMA防护等级防护等级IP 3031326465 66 68NEMA123R312,12K和和134和和4X(防腐蚀防腐蚀)7和和7X(防腐蚀防腐蚀)
《防爆知识普及课程》PPT课件
