FIELD: measurement technology. SUBSTANCE: measured flow is passed through constrictor, part of flow is taken away through two parallel by-pass tubes. laminar throttle is placed into one tube and turbulent throttle and heat flowmeter - into the other one. Taken part of flow is returned downstream from construction. Mass flow is measured in by-pass tube by heat flowmeter and mass flow across constrictor is determined. EFFECT: enhanced authenticity of method. 1 dwg
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