余氯在线检测系统的设计及单片机编程优化

研究了余氯传感器的工作原理及结构并设计了一系列信号处理电路，将余氯传感器的输出电流信号经过电流转电压模块、差分放大模块、二级放大模块、A/D转换模块输入到单片机（MCU）电路进行处理计算，在计算结果实时显示在LED显示屏的同时，完成水中余氯值的在线测量。利用N，N-二乙基对苯二胺（DPD）光度法绘制了标定曲线，并基于STC89c52单片机优化。与美国哈希SC9184在线余氯仪进行比较，结果表明所设计的系统具有较好的稳定性与可靠性，相对误差小于5%，能较好地完成饮用水的在线测量。

Design of a residual chlorine on-line detection system and MCU programming optimization

A signal processing circuit has been designed based on the principle of a residual chlorine sensor. The output current signal of the residual chlorine sensor is input to the microcontroller unit (MCU) circuit through the current to voltage circuit, the differential amplifier circuit, the second amplifying circuit and the A/D conversion circuit. The result is displayed on the LED screen by MCU processing. The online measurement of the residual chlorine value is thus completed. N,N-diethyl-p-phenylenediamine(DPD)spectral photometric measurements were used to obtain a calibration curve. A STC89c52 single-chip microcomputer was used for the optimization. Compared with the Hash SC9184 residual chlorine online instrument developed in the USA, our system has better stability and reliability; the relative error is less than 5%.