摘要：眾所周知, 電導測量在工業生產和科學實驗中有著十分重要的意義。電導儀是測定溶液導電度大小的儀器,由于其方法簡單、速度快、準確度高而廣泛運用于火電、化工化肥、冶金、制藥、環保等行業以及其它精密測試分析中。電導法也是水質鑒定和監測的重要手段,它是通過測量水溶液的電導值,并根據溶液的電導與溶液中待測離子的濃度之間的定量關系來確定待測離子的含量的。
電導儀是一種應用非常廣泛的測量儀器。然而，傳統電導儀的溫度、極化效應和電容效應的影響引起的誤差需人工進行補償，或使用復雜的硬件電路，造成使用不便，電路復雜、校正范圍小。
本論文在大量的試驗基礎上，把單片機應用到測量儀器中，將電導池看作電導檢測電路中的一個輸入電阻，采用單片機輸出交變信號作為電源激勵檢測電路，使用單片機控制量程的自動切換，接著進行數字式全波整流，并且充分利用單片機儀器的優勢,將檢測電路的增益系數的調準和誤差的補償用軟件來實現,最大限度地簡化了硬件電路，增加了LCD液晶顯示模塊，設計研制成智能電導監測儀。該儀器具有測量精度高，自動量程切換，電導率值直讀顯示，操作簡單等優點。
關鍵詞：電導儀；單片機；電導率；軟件補償；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
