The working principle of continuous emission monitoring system, control functions and functions of host monitor software of continuous emission monitoring system (CEMS) based on S7-200 PLC and main points of daily maintenance of CEMS are introduced.%介绍烟气在线监测系统的工作原理,以及基于S7-200PLC的烟气在线监测系统(CEMS)的控制功能及上位机监控软件的功能并说明CEMS日常维护的要点。
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