FIELD: measuring equipment. SUBSTANCE: pressure drop is measured when fluid flows through a converging unit. The flow rate is then increased by a value of additional calibrated flow rate and the pressure drop is measured again. The total flow rate is then decreased arbitrary, the pressure drop is measured again and one stops additional calibrated flow rate. The pressure drop is measured once more. In so doing the additional flow rate is arbitrary. The flow rate is determined by a relationship available in the invention description. EFFECT: enhanced accuracy. 1 dwg
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