1746-F5
1746-F5
①1对1结构。1台仪表，1对传输线，单向传输1个信号。这种结构造成接线庞杂、工程周期长、安装费用高、维护困难。
②可靠性差。模拟信号传输不仅精确度低，且易受干扰。为此采用各种措施提高抗干扰性和传输精确度，其结果是增加了成本。
③失控状态。操作员在控制室既不了解现场模拟仪表的工作状况，也不能对其进行参数调整，更不能预测事故，导致操作员对其处于失控状态。因操作员不能及时发现现场仪表故障，而发生事故已屡见不鲜。
④互操作性差。尽管模拟仪表已统一4～20mA信号标准，可大部分技术参数仍由制造商自定，致使不同品牌仪表无法互换。因此导致用户依赖制造厂，无法使用性能价格比**的配套仪表，甚至出现个别制造商垄断市场的局面。
现货，现货，降降降，火火火，火火火……
现货，现货，降降降，火火火，火火火……
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◆ 联系人： 小廖（女士）
◆ 电话：0592-6539066
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◆ QQ:1490371370
诚信经营，质量为首，服务至上，厦门泰尼小廖竭诚为您服务！！！
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