Capacitance Level Measurement Working Principle

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Capacitive level transducer is an example of indirect measurement of level



Capacitance level sensors are useful for wide selection of solids, aqueous and organic liquids, and slurries. The technique is frequently referred  as RF as radio frequency signals applied to the capacitance circuit. The sensors could be made to sense material with dielectric constants only 1.1 (coke and fly ash) and as high as 88 (water) or more. Sludges and slurries such as dehydrated cake and sewage slurry (dielectric constant approx. 50) and liquid chemicals such as quicklime (dielectric constant approx. 90) can be sensed. Dual-probe capacitance level sensors can be used to sense the interface between two immiscible liquids with substantially different dielectric constants.Hit on capacitance level sensor to explore more about our services and sites. Hope you ll like our more services.

 

Since capacitance level sensors are electronic devices, phase modulation and the usage of higher frequencies makes the sensor suited to applications by which dielectric constants are similar.



Working Principle:

The principle of capacitive level measurement is founded on change of capacitance. A covered electrode acts together plate of capacitor and the tank wall (or reference electrode in a non-metallic vessel) acts as one other plate. The capacitance depends upon the fluid level. A clear tank has a lower capacitance while a filled tank has a higher capacitance.



 An easy capacitor includes two electrode plate separated by a small thickness of an insulator such as solid, liquid, gas, or vacuum. This insulator is also called as dielectric.