Capacitive transducer circuits for liquid level measurement
Sheroz Khan, Kyaw Kyaw Htike Muhammad Ali, Md. Rafiqul Islam, Othman Omran Khalifa, Ismail Adam · 2008
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.