METHOD FOR MEASURING THE LEVEL OF LIQUID AND MASS IN FUEL TANKS AND RESERVOIRS DURING ROLLING AND TILTING AND APPARATUS FOR IMPLEMENTATION THEREOF Russian patent published in 2021 - IPC G01F23/26 

FIELD: measuring equipment.

SUBSTANCE: invention relates to measuring equipment, namely, to methods and means for measuring the level, volume and mass of liquids in reservoirs with petroleum, petroleum products, liquefied gases, etc., and can be applied in apparatuses for measuring the fuel reserves in tanks of vessels and vehicles. Substance: the inventions use a three-link phasing RC-chain containing capacitive level sensors and external resistances and together with an amplifier forming a generator, the frequency whereof is used to determine the level and mass of the liquid. The capacitive level sensors are made in the form of flat capacitors made of foiled fibreglass laminate plates, the upper plates whereof are located on a floating roof or at the top of the reservoir, and the lower common plate is located at the bottom of the reservoir. The upper plate of the central capacitor of the capacitive sensor therein has an area twice as large as the area of each of the other four plates arranged uniformly symmetrically along the axes of symmetry of the reservoir. One link of the three-link phasing RC chain includes the upper plate of the central capacitor with an external resistance, and the other two links include the upper plates of the capacitors arranged uniformly symmetrically along one axis, connected in parallel, and external resistances. The mass of the liquid is determined accounting for the shape of the inner cavity of the reservoir, and the calculations are adjusted depending on the temperature, permittivity and density of the liquid. The program of the microcontroller included in the apparatus is equipped with a graduated characteristic of the dependence of frequency on the mass of the liquid, accounting for the shape of the inner cavity of the reservoir, as well as an adjustment of the calculations of level and mass from the sensors of the temperature, permittivity and density of the liquid, supplied to the input thereof.

EFFECT: possibility of continuous measurement of the level of liquid when the position of the reservoir in space changes, possibility of calculating the mass accounting for the shape of the inner cavity of the reservoir and the corrections for temperature, density and permittivity, simplified requirements for the structure of the measured object.

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