摘  要：為實(shí)現(xiàn)恒電位儀的自動化控制，使金屬管道始終處于受保護(hù)狀態(tài)，設(shè)計(jì)對陰極保護(hù)設(shè)備恒電位儀的輸出保護(hù)參數(shù)（通電電位、斷電電位、交流電位、自腐蝕電位）進(jìn)行監(jiān)控的電路。該監(jiān)控系統(tǒng)以Cortex-M3內(nèi)核的微控制器STM32為核心，以多通道信號調(diào)理電路為數(shù)據(jù)采集單元，通過RS485總線實(shí)現(xiàn)與恒電位儀的通信，采用GPRS作為數(shù)據(jù)傳輸網(wǎng)絡(luò)，將恒電位儀的各項(xiàng)參數(shù)采集后發(fā)送回服務(wù)器，服務(wù)器對數(shù)據(jù)進(jìn)行分析處理，得出恒電位儀的工作狀態(tài)以及被監(jiān)測管道的受保護(hù)狀態(tài)。系統(tǒng)需要調(diào)節(jié)恒電位儀輸出功率時，服務(wù)器通過GPRS網(wǎng)絡(luò)將參數(shù)傳輸?shù)奖O(jiān)控系統(tǒng)，監(jiān)控系統(tǒng)通過RS485總線實(shí)現(xiàn)對恒電位儀的控制。實(shí)測結(jié)果表明：恒電位儀輸出電流的測量范圍為0～80A，準(zhǔn)確度在±0.48%以內(nèi)；管道通電電位測量范圍為-3～3 V，準(zhǔn)確度在±7 mV以內(nèi)，能夠?qū)崿F(xiàn)對埋地金屬管道恒電位參數(shù)的遠(yuǎn)程監(jiān)控。
關(guān)鍵詞：金屬管道；腐蝕；陰極保護(hù)；恒電位儀；遠(yuǎn)程監(jiān)控系統(tǒng)
文獻(xiàn)標(biāo)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