摘  要：為實現恒電位儀的自動化控制，使金屬管道始終處于受保護狀態，設計對陰極保護設備恒電位儀的輸出保護參數（通電電位、斷電電位、交流電位、自腐蝕電位）進行監控的電路。該監控系統以Cortex-M3內核的微控制器STM32為核心，以多通道信號調理電路為數據采集單元，通過RS485總線實現與恒電位儀的通信，采用GPRS作為數據傳輸網絡，將恒電位儀的各項參數采集后發送回服務器，服務器對數據進行分析處理，得出恒電位儀的工作狀態以及被監測管道的受保護狀態。系統需要調節恒電位儀輸出功率時，服務器通過GPRS網絡將參數傳輸到監控系統，監控系統通過RS485總線實現對恒電位儀的控制。實測結果表明：恒電位儀輸出電流的測量范圍為0～80A，準確度在±0.48%以內；管道通電電位測量范圍為-3～3 V，準確度在±7 mV以內，能夠實現對埋地金屬管道恒電位參數的遠程監控。
關鍵詞：金屬管道；腐蝕；陰極保護；恒電位儀；遠程監控系統
文獻標志碼：A       文章編號：1674-5124（2016）01-0069-05
Design of field monitoring system with constant potential parameters
of buried metal pipes
XIONG Chuanyun1， LIU Mingzhe1，2， TUO Xianguo1， TAN Chengjun2， LUO Qun2
（1. State Key Laboratory of Geoharzard Prevention and Geoenvironment Protection（Chengdu University of
Technology），Chengdu 610059，China；
2. Provincial Key Laboratory of Applied Nuclear Techniques in Geosciences（Chengdu University of
Technology），Chengdu 610059，China）
Abstract: To realize automatic control of potentiostats and put metal pipes in protection， a circuit has been designed that can monitor and control the protection parameters (on/off potential， AC potential， self-corrosion potential) which are sent out from the potentiostat for cathodic protection equipment. In the monitoring system is composed of a microcontroller STM32 as its core part in kernel Cortex-M3 and a multi-channel signal conditioning circuit as its data acquisition unit. The system is communicated with the potentiostat via bus RS485； the GPRS network is used to collect all the parameters of the potentiostat and send them back to the server; the data is further treated by the server to get the working state of the potentiostat and the protection state of the pipeline monitored. If the output power of the potentiostat needs adjusting， the parameters will be transferred from the server to the monitoring system through the GPRS network and the potentiostat will be controlled by the RS485 bus of the monitoring system. Experimental results have shown that the output current of the potentiostat is measured from 0 - 80 A， with the accuracy inside ±0.48%； the electric potential of the pipeline is measured from -3-3 V， with the accuracy inside ±7 mV. The system can be used to monitor remotely the constant potential parameters of buried metal pipelines.
Keywords: metal pipeline； corrosion； cathodic protection； potentiostat； remote monitoring system