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5、ices 规范信号输出规范信号输出 (4-20mA) 高共模电压高共模电压 高安装本钱高安装本钱 需求隔离接地需求隔离接地 危险区仪表必需与地隔离危险区仪表必需与地隔离 平安栅压降平安栅压降 齐纳走漏电流导入误差齐纳走漏电流导入误差 平安和功能检测困难平安和功能检测困难 低共模电压低共模电压 价钱高价钱高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 3 固体异物直径大于固体异物直径大于2.5mm 4 固体异物直径大于固体异物直径大于1.0mm 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 延续浸水延续浸水KINGWAYS CONTROL The process control experts