摘要：众所周知, 电导测量在工业生产和科学实验中有着十分重要的意义。电导仪是测定溶液导电度大小的仪器,由于其方法简单、速度快、准确度高而广泛运用于火电、化工化肥、冶金、制药、环保等行业以及其它精密测试分析中。电导法也是水质鉴定和监测的重要手段,它是通过测量水溶液的电导值,并根据溶液的电导与溶液中待测离子的浓度之间的定量关系来确定待测离子的含量的。
电导仪是一种应用非常广泛的测量仪器。然而，传统电导仪的温度、极化效应和电容效应的影响引起的误差需人工进行补偿，或使用复杂的硬件电路，造成使用不便，电路复杂、校正范围小。
本论文在大量的试验基础上，把单片机应用到测量仪器中，将电导池看作电导检测电路中的一个输入电阻，采用单片机输出交变信号作为电源激励检测电路，使用单片机控制量程的自动切换，接着进行数字式全波整流，并且充分利用单片机仪器的优势,将检测电路的增益系数的调准和误差的补偿用软件来实现,最大限度地简化了硬件电路，增加了LCD液晶显示模块，设计研制成智能电导监测仪。该仪器具有测量精度高，自动量程切换，电导率值直读显示，操作简单等优点。
关键词：电导仪；单片机；电导率；软件补偿；全波整流
Abstract:As we all know, conductivity measurement in industrial production and scientific experiments is of great significance. Conductance NG is the solution conductivity of the size of machines, because of their method is simple, fast and high accuracy and wide application of thermal power, chemical fertilizer, metallurgy, pharmaceuticals, environmental protection and other industries, as well as other sophisticated test analysis. Conductivity is the water quality monitoring and identification of important means, it is aqueous solution by measuring the conductivity values, and the solution according to the solution conductivity and the concentration of analyze ion the quantitative relationship between the analyze ions to determine the content.
Conductance instrument is a very extensive application of the measurement apparatus. However, traditional instrument temperature conductivity, capacitance effects and polarization effect of the error caused the need for artificial compensation or the use of complex hardware circuit, causing inconvenience to the use of circuit complexity, the scope of a small correction.
In this paper, in a lot of experiments, based on SCM application of the instrument, conductance pool will be seen as conductivity detection circuit of an input resistance. SCM using alternating signal output power as incentive detection circuit, the use of SCM control range of automatic switching, followed by digital full-wave rectifier, and take full advantage of the advantages of microcontroller devices. Detection Circuit will gain coefficient fine-tune and error compensation software to achieve maximum simplifies the hardware circuit, increase the LCD display module, the design and development of a smart conductivity monitor. The instrument has high measurement accuracy, automatic switching range, the conductivity value of direct reading, the advantages of simple operation.
Keywords：Conductance NG； Conductivity； SCM；Software Compensation ；Full-wave rectifier
