METHOD OF MEASURING DENSITY AND LEVEL OF LIQUID Russian patent published in 2005 - IPC

FIELD: measurement technology.

SUBSTANCE: method can be also used in chemical and food industry for measuring variable level of liquid with unknown density in containers working as under condition of vacuum rarefaction and under high pressure. Two hydrostatic pressure transducers are used for realization. The transducers are disposed one above the other at known distance. According to the method, only readings of lower transducer are used at the moment of transition of gas-liquid boundary through upper transducer but not the difference in readings of both transducers. Moment of transition is defined as moment of equality to zero of difference in corresponding integral conversions from signals of lower and upper transducers. After moment of transition is defined, density and level of liquid is estimated on the base of equations of σ=D_k/gH₀ and H=H₀D₁/D_k, where σ is density of liquid, H is current value of level, H₀ is known distance between transducers, D₁ is current readings of lower pressure transducer, D_k is readings f lower pressure transducer at the moment of transition of boundary level through upper transducer, g is free fall acceleration.

EFFECT: improved precision of measurement; reduced cost of equipment; reduced service cost.

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