FIELD: measuring equipment. SUBSTANCE: additional flow crosses the flow to be measured. The additional flow is separated by baffles which are arranged crosswise respectively to the additional flow. The pressure drop at the flow cross is measured and flow rate is determined. The additional flow is created by either moving the separating baffles or the baffle move by the additional flow. The baffles can move depending on their interaction with the additional flow or the additional flow is controlled depending on the pressure drop. EFFECT: improved accuracy. 5 cl, 3 dwg
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