lindab | dampers and measure units Damper with flow meter FMDRU Technical data Sound Sound generation has been measured at the Swedish Na- tional Testing and Research Institute in an reverberation room, in accordance with ISO 5135 and ISO 3741. Flow graph for balancing The graph show the flow, q, as a function of the pressure dif- ference in the measurement nozzles. Flow data for dimen- sioning differs from this graph. Ød 1 [mm] 3 00 100 Measurement function Measure pressure difference, Dp, between the measurement nozzles, and use the equation on the units plate to derive the duct flow. Measurement accuracy If the velocity profile is asymmetric, the measurement values can differ from the ideal values. For this reason, the flow me- ter should never be located right up to any flow disturbance. The method error in the table below will differ, depending on the distance to the flow disturbance. l 1 =straight distance before meter Type of disturbance A 90° bend Method error m 2 5% 10% Δ p [Pa] 80 100 125 160 200 250 3 15 400 500 6 3 0 Ød 1 50 2·d 1 1·d 1 l 1 10 10 50 50 100 100 500 500 1000 q 1000 5000 [l/s] 5000 10000 [m 3 /h] l 2 = straight distance after meter 1·d 1 1·d 1 DUCT-MC Identification number 17.11.002 Lindab reserves the right to make changes without prior notice 2 2020-07-13
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