阀-执行器集成参考电极，用于超长寿命瘤胃 pH 传感器。

Valve-Actuator-Integrated Reference Electrode for an Ultra-Long-Life Rumen pH Sensor.

机构信息

Department of Human and Engineered Environmental Studies, Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8563, Japan.

Sensing System Research Center, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8564, Japan.

出版信息

Sensors (Basel). 2020 Feb 25;20(5):1249. doi: 10.3390/s20051249.

DOI:10.3390/s20051249

PMID:32106461

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7085735/

Abstract

We demonstrated a newly developed Ag/AgCl reference electrode- with a valve-actuator for two years or longer rumen pH monitoring. Previous studies on pH sensors reported that the short lifetime of Ag/AgCl reference electrodes is caused by an outflow of internal electrolyte. We introduced a valve-actuator into a liquid junction to reduce the outflow by intermittent measurement. The results indicated that the potential change when switching the liquid junction was less than 0.5 mV and its response time was less than 0.083 s. In the 24-h potential measurement with the valve-actuator-integrated reference electrode (VAIRE), the valve was actuated once every hour, and the standard deviation of the potential was 0.29 mV. The lifetime of the VAIRE was estimated at 2.0 years calculating from an electrolyte outflow, which is significantly longer than that of conventional reference electrodes. A pH sensor using the VAIRE was estimated to operate for 2.0 years with the pH error ≤0.1, which meets the requirement of cows' rumen pH monitoring.

摘要

我们展示了一种新开发的 Ag/AgCl 参比电极-带有阀门执行器-用于两年或更长时间的瘤胃 pH 监测。以前关于 pH 传感器的研究报告称，Ag/AgCl 参比电极的短寿命是由于内部电解质的外流造成的。我们在液接处引入了一个阀门执行器，通过间歇测量来减少电解质的外流。结果表明，切换液接时的电位变化小于 0.5 mV，其响应时间小于 0.083 s。在带有阀门执行器的参比电极（VAIRE）的 24 小时电位测量中，每小时启动一次阀门，电位的标准偏差为 0.29 mV。根据电解质的外流情况，VAIRE 的寿命估计为 2.0 年，明显长于传统参比电极。使用 VAIRE 的 pH 传感器的估计寿命为 2.0 年，pH 误差≤0.1，满足奶牛瘤胃 pH 监测的要求。