电子技术的飞速发展,使生物分离纯化过程的主要参数进行自动检测和操作自动控制成为现实。电导率、pH等参数是区分不同生物样品的重要参数,目前生物医学制药等相关成分的检测和分析中,电导仪和pH计起着重要作用。本文通过分析研究pH和电导率的测量原理以及影响其测量的因素,针对生物分离纯化的测量环境,设计了电位法测量pH值的处理电路,提出了高频交流脉冲激励测量电导率 The rapid development of electronic technology, the main parameters of the process of separation and purification of biological automatic detection and operation control to become a reality. Conductivity, pH and other parameters are important parameters to distinguish different biological samples, the current biomedical pharmaceutical and other related components of the detection and analysis, the conductivity meter and pH meter plays an important role. In this paper, by analyzing the measurement principle of pH and conductivity and the factors that affect the measurement, according to the measurement environment of biological separation and purification, a processing circuit for measuring pH value by potentiometric method is designed, and the high frequency AC pulse excitation is proposed to measure the conductivity