In this paper,it briefly expounds the structure and working principle of the online PH instrument,describes in details the installation method and maintenance method of PH instrument in waste water treatment system so as to achieve the aim of prolonging its service life and getting the accurate measuring results.%简单阐述了在线PH仪的结构、组成及工作原理,详细描述了PH仪在污水处理系统中的安装方法及使用维护方法,以达到延长仪表使用寿命、得到准确测量结果的目的。
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