plate of flowmeters with a hole through it, placed perpendicular to the flow, and constricts the flow, and measuring the pressure differential across the constriction gives the flow rate, voomõõturi õhuke vahesein, millel on ava, mis on asetatud vooga risti, ja see kitsendab voo ja rõhuerinevuse, mille tõttu mõõtmine kitsenduses annab vookiiruse