The utility model relates to a measuring device, in particular to a high-precision measuring system for pure water conductivity, which comprises an excitation source generating unit, a sampling resistance switching unit, a thermistor voltage sampling unit and a processing unit. The sampling circuit switching unit adopts a multiplexer U2, a gated terminal and an enabling terminal of the multiplexer U2 are connected to the processing unit, and the output of the excitation source generating unit is connected to the processing unit. The end is connected to the input end of the multiplexer U2, the output end of the multiplexer U2 is provided with a number of parallel sampling resistors, a number of parallel sampling resistors are connected in series with positive electrodes, positive electrodes and negative electrodes are placed in the pure water to be measured, and the thermistor is also placed in the pure water to be measured. The voltage signals between positive electrodes and negative electrodes are connected to the processing unit through the pure water voltage integration measuring circuit, and the thermistor electrodes are connected to the processing unit. The output end of the voltage sampling unit is connected to the processing unit through the thermistor voltage integration circuit. The utility model eliminates the polarization of the electrode, improves the measuring accuracy, and measures the water quality of pure water stably and reliably.
【技术实现步骤摘要】
纯水电导率的高精度测量系统
本技术涉及一种测量装置,具体涉及一种纯水电导率的高精度测量系统。
技术介绍
近年来,纯水机设备在医疗领域不断地被推广应用,电导率作为纯水的关键指标,常被用于确定纯水水质的合格与否,所以电导率的高精度测量显得非常必要。目前,市场上销售及使用的电导率测量仪器,有的采用直流法,造成电极极化,影响实际电压数值;有的测量范围太大且采用单一采样电阻,电导率较大或较小时测量精度的提高非常困难;有的采用线性温度补偿,造成温度校正效果较差;以上所述都将造成纯水电导率的测量精度降低。
技术实现思路
为解决上述技术问题,本技术的目的在于:提供一种纯水电导率的高精度测量系统,消除电极极化,提高测量精度,稳定可靠地测量纯水水质。本技术为解决其技术问题所采用的技术方案为:所述纯水电导率的高精度测量系统,包括激励源产生单元、采样电阻切换单元、热敏电阻电压采样单元和处理单元,采样电路切换单元采用多路复用器U2,多路复用器U2的选通端和使能端连接至处理单元,激励源产生单元输出端连接至多路复用器U2的输入端,多路复用器U2输出端设置若干并联的采样电阻,若干并联的采样电阻串联电极正极,电极正极和电极负极置入待测纯水中,热敏电阻也置入待测纯水中,电极正、负极间电压信号经纯水电压积分测量电路连接至处理单元,热敏电阻电压采样单元输出端经热敏电阻电压积分电路连接至处理单元。本技术由激励产生单元产生激励源,将激励源通过多路复用器U2作用在选通的采样电阻及电极正负极串联的电路上,根据电极间纯水的电阻值变换合适的采样电阻,利用分压原理采样电极正负极间电压,进而通过纯水电压积分测量电路获得 ...
【技术保护点】
1.一种纯水电导率的高精度测量系统,其特征在于,包括激励源产生单元、采样电阻切换单元、热敏电阻电压采样单元和处理单元,采样电路切换单元采用多路复用器U2,多路复用器U2的选通端和使能端连接至处理单元,激励源产生单元输出端连接至多路复用器U2的输入端,多路复用器U2输出端设置若干并联的采样电阻,若干并联的采样电阻串联电极正极,电极正极和电极负极置入待测纯水中,热敏电阻也置入待测纯水中,电极正、负极间电压信号经纯水电压积分测量电路连接至处理单元,热敏电阻电压采样单元输出端经热敏电阻电压积分电路连接至处理单元。
【技术特征摘要】
1.一种纯水电导率的高精度测量系统,其特征在于,包括激励源产生单元、采样电阻切换单元、热敏电阻电压采样单元和处理单元,采样电路切换单元采用多路复用器U2,多路复用器U2的选通端和使能端连接至处理单元,激励源产生单元输出端连接至多路复用器U2的输入端,多路复用器U2输出端设置若干并联的采样电阻,若干并联的采样电阻串联电极正极,电极正极和电极负极置入待测纯水中,热敏电阻也置入待测纯水中,电极正、负极间电压信号经纯水电压积分测量电路连接至处理单元,热敏电阻电压采样单元输出端经热敏电阻电压积分电路连接至处理单元。2....
【专利技术属性】
技术研发人员:李岱华,张士超,张忠亮,
申请(专利权)人:山东康辉水处理设备有限公司,
类型:新型
国别省市:山东,37
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