An innovative method for the measurement of liquid level of a conducting liquid

Accurate measurement of liquid level in a storage tank is an essential requirement of any process plant. Various conducting liquids like tape water, acid solution alkali solution etc. are stored in storage tanks. Measurement of liquid level in these tanks may be done by various techniques such as float type, displacer type, capacitance type etc. In the present paper an accurate non-contact capacitance type technique is described. In this technique measurement errors due to stray capacities effect atmospheric effect, parasitic effect, perpendicular plate capacitance effect etc. observed in conventional capacitive techniques are eliminated. Due to these effects, the conventional capacitance type level transducers require frequent recalibration. This difficulty is avoided in the proposed technique. From the experimental study of the proposed transducer. it is found to have a linear characteristic with minimum measurement error.