求助,有关工程师,LMP91200芯片做PH值检测,电极应采用复合电极还是玻璃电极与参比电极作为PH值检测?电极应该接在芯片的GUARD1、GUARD2、INP、VCM这四个引脚的哪几个引脚?谢谢
您好,LMP91200设计是用于2个端子的电极,即为复合电极,使用的是INP和Vocm引脚。数据手册上有介绍:
The LMP91200 is designed for 2-electrode sensors。
pH electrodes are composed of a sensing electrode with the reference
electrode built into the same electrode body, and they are called combination electrodes。
Guard 1 和guard2 我认为接地处理。