The paper mainly discusses the automatic switching of the logic estimation circuit of the drum boiler's water level protection system.

文章主要讨论了锅炉汽包水位高低保护系统逻辑判断回路的自动切换。

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How to get the drum water-level signal is analyzed. The analogue signal is used in this design. The water-level signal is fully determined and it makes the water-level protection exact and reliable.

分析了汽包水位信号的摄取方式，采用模拟信号的方式，对水位信号进行充分鉴别，使水位保护准确可靠。

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