Capacitive transducer circuits for liquid level measurement

• Main Authors: Khan, Sheroz, Muhammad Ali, Kyaw Kyaw Htike @, Alam, A. H. M. Zahirul, Islam, Md. Rafiqul, Khalifa, Othman Omran, Adam, Ismail
• Format: Article
• Language: English
• Published: IJCSES 2008
• Subjects: TK Electrical engineering. Electronics Nuclear engineering
• Online Access: http://irep.iium.edu.my/26310/1/v2-3-6.pdf; http://irep.iium.edu.my/26310/; http://bit.kuas.edu.tw/~ijcses/Year2008.htm
• Institution: Universiti Islam Antarabangsa Malaysia

This work is making use of the capacitive element that is made of two electrodes - a column of liquid the level of which is to be measured, and a metallic tube that is pulled and fitted over a PVC tube of accordingly smaller dimensions. Both of the electrodes are provided with contact terminals for easy connection within a bridge circuit, which is powered by a sinusoidal source of given amplitude and known frequency. Precautionary measures are taken for improved linearity and minimal interference of the power supply on experimental data obtained as a result of measurement. The experimental data shows good consistency with the theoretical details and derivations.