带温度补偿的隔离式低功耗pH值测量系统设计
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摘要
pH值检测是理化检测的常见项目之一,采用AD7793设计了带温度补偿的低功耗pH值测量系统,基于Labview的上位机界面实时显示测量数值。该系统主要包括pH探针电路、RTD电路、AD采样电路等,应用了缓冲器、数字隔离、光纤通信等硬件电路提高了系统的可靠性,同时预留了一路4-20m A电流输出拓展了应用场合。实验测试表明,该系统使用简单、稳定可靠,既适用于理化检测实验室环境的需求,又能够满足工业场合的应用需求。
The pH value detection is one the more common project of physicochemical testing.This paper presents a design of low-power pH value detection system with temperature compensated,which based on embedded technology and AD7793.pH value was monitored by upper computer.The design mainly includes pH probe circuit,RTD circuit and AD sampling circuit,etc.Buffer circuit,digital isolation and fiber communication are applied in order to improve the reliability of the system. 4-20 m A current output was reserved,which extended application scene.The test proved the system worked simply and stably,which could meet needs of physical and chemical testing laboratory and industrial situations.
The pH value detection is one the more common project of physicochemical testing.This paper presents a design of low-power pH value detection system with temperature compensated,which based on embedded technology and AD7793.pH value was monitored by upper computer.The design mainly includes pH probe circuit,RTD circuit and AD sampling circuit,etc.Buffer circuit,digital isolation and fiber communication are applied in order to improve the reliability of the system. 4-20 m A current output was reserved,which extended application scene.The test proved the system worked simply and stably,which could meet needs of physical and chemical testing laboratory and industrial situations.
引文
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[4]李天博,赵文青,黄振跃,等.基于nrf9e5的无线p H值检测模块设计[J].仪表技术与传感器,2009(4):62-63,75.
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[8]宾俊,艾芳芳,刘念,等.基于Arduino和Python搭建的实时在线p H测量平台[J].计算机与应用化学,2013(1):48-52.
[2]祁建广,李宝营,李仁庆.超低功耗水质p H检测仪设计[J].仪表技术与传感器,2017(3):118-120,126.
[3]林大煊,唐荣年,王云强,等.基于Android系统的p H参数测量仪设计[J].仪表技术与传感器,2014(7):58-60.
[4]李天博,赵文青,黄振跃,等.基于nrf9e5的无线p H值检测模块设计[J].仪表技术与传感器,2009(4):62-63,75.
[5]吕登峰.基于ARM的水质PH检测系统设计与实现[D].西安:西安电子科技大学,2015.
[6]刘海,杨慧中.一种智能在线p H检测仪[J].江南大学学报(自然科学版),2012(2):173-177.
[7]邹应全,行鸿彦.高精度p H测量仪研究[J].测控技术,2010(9):1-4.
[8]宾俊,艾芳芳,刘念,等.基于Arduino和Python搭建的实时在线p H测量平台[J].计算机与应用化学,2013(1):48-52.