Electrical Conductivity Measurement Method in Seawater Desalination Based on Variable Frequency Ezcitation

摘要：

Electrical conductivity is one of the necessary parameters of water quality detection in the seawater desalination. By analyzing the shortcomings of traditional measurement methods,an electrical conductivity measurement method based on the variable frequency excitation was proposed. The factors affecting measurement error such as temperature,electrode polarization and capacitance effect were analyzed. It was demonstrated that the variable frequency excitation method can effectively overcome the error caused by these factors. Sine wave with different frequency was taken as excitation source for different electrical conductivity range. The appropriate feedback resistor was selected in the measurement circuit. The electrical conductivity signal was obtained by the exact signal amplifier circuit and acquisition circuit. The measurement value was obtained after temperature compensation. The measurement system was calibrated with conductivity calibration solution. Finally the accurate value can be got. This method meets the accuracy requirement of online water quality monitoring in seawater desalination.

关键词： seawater desalination electrical conductivity variable frequency ezcitation online measurement.

作者: Shaopeng Hu Kaihua Wu Haibo Wang Jiang Chen

作者单位: School of Automation,Hangzhou Dianzi University,Hangzhou 310018,China

会议类型: 国际会议

会议名称: 2009 9th International Conference on Electronic Measurement & Instruments(第九届电子测量与仪器国际会议 ICEMI2009)

会议地点: 北京

会议语种:英文

页码: 810-813

在线出版日期: 2009-08-16（万方平台首次上网日期，不代表论文的发表时间）