Design and implementation of an industrial C4D sensor for conductivity detection

• Published in: Sensors and actuators. A. Physical. Vol. 213; pp. 1 - 8
• Main Authors: Ji, Haifeng, Li, Zhongzhu, Wang, Baoliang, Huang, Zhiyao, Li, Haiqing, Yan, Yong
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.07.2014
• Subjects: Capacitively coupled contactless conductivity detection (C4D); Contactless conductivity detection; Fluid; Series resonance; Shield configuration; Shield configuration; Contactless conductivity detection; Series resonance; Capacitively coupled contactless conductivity detection (C4D); Fluid
• ISSN: 0924-4247; 1873-3069
• DOI: 10.1016/j.sna.2014.03.024

•The C4D sensor is suitable for industrial application.•The shield configuration can overcome the interference in industrial fields.•The C4D sensor can work effectively in larger scale pipes (up to 7.6mm in diameter). A capacitively coupled contactless conductivity detection (C4D) sensor suitable for conductivity detection of electrolyte solution in industrial fields is developed. Series resonance principle is adopted to remove the influence of coupling capacitances and hence to implement the conductivity detection in large pipelines. A special shield configuration is designed to eliminate the influence of the stray capacitance, to overcome the negative influence of the interference in industrial fields and to be suitable for the metal connection in industrial fields. Conductivity detection experiments were carried out on four different sized pipes with inner diameters of 1.8mm, 3.3mm, 5.0mm and 7.6mm, respectively. The experiment results show that the C4D sensor for industrial application is successful and the accuracy of conductivity detection is satisfactory. Discussions concerning the advantages and disadvantages of the C4D sensor are presented.