State working principle of capacitive type level sensor with diagram.

State working principle of capacitive type level sensor with diagram. 
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Answer :

Principle of working : The capacitive level detector operates on the equation of parallel plate capacitor, i.e.

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Where, C = capacitance value in farad ε = dielectric constant d = distance between two plate in m A = common area of plate in m2 . 

If A and d are constant then capacitance is directly proportional to dielectric constant i.e. C α dielectric constant (ε ). This principle is used in the capacitance level gauge for detecting level change.

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