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可编程序控制器Ｃ２００Ｈ系统应用于烧碱蒸发系统分别对蒸发器各效液面、出碱浓度等进行自动控制。ＰＣ机对液面的高低采用超时报警加以控制；出碱浓度靠蒸发器汽相和液相间的温差间接测定，采用温度变送器做测量信号输入，在蒸发器上部汽相加测温小罐的方法较准确地测得烧碱浓度，利用Ｃ２００Ｈ高智能功能设计自动出碱程序。
Programmable controller C200H system used in caustic soda evaporation system, respectively, the evaporator effect of the liquid level, the concentration of alkali for automatic control. The level of the liquid level of the PC is controlled by the overtime alarm. The concentration of the alkali is determined indirectly by the temperature difference between the vapor phase and the liquid phase of the evaporator. The temperature signal is input through the temperature transmitter. The method of canister can measure the concentration of caustic soda more accurately, and design the automatic caustic soda process by using C200H high intelligent function.