FIELD: ventilation.
SUBSTANCE: device includes: a bell-mouth equipped with a gateway for air inlet into the plug fan; a differential pressure cover that is connected to the bell-mouth to transfer a change in inlet pressure in the pipe; also a differential pressure measuring unit for determining the change in inlet pressure transmitted through the pipe. In accordance with the present invention, the differential pressure is measured on the plug fan suction inlet side, where the air flow is the most stable, preventing the device from resisting the air flow so as to prevent turbulence, thereby providing an accurate measurement of the differential pressure.
EFFECT: increased accuracy of differential air flow pressure measurements in the fan.
5 cl, 7 dwg
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