The
damper DIRU with flow meter offers measurement of the air flow. DIRU
has the following characteristics: low noise level, centric flow, fixed
measurement nozzles for accurate flow measurement and is equipped with
regulating facilities that can be fully opened, which means that you do
not need cleaning covers. It fulfils tightness class C.
The
dimension graph is to be used to determine the pressure drop over the
damper with flow meter and to give information regarding the sound
effect level at different settings. When balancing the system the
balancing graph should be used.
The
damper blades forms a measuring flange which allows flow measuring. By
measuring the pressure difference between the measure nozzles, you can
through the equation on the damper derive the flow q [l/s]. The setting
value of the damper and the correction factor (k-factor) is the same
number which means that you do not have to read a graph in order to get
the k-factor from a setting value.
The air flow is regulated with a handle.
Ø 80–630 fullfills pressure class A in closed position.
The damper is made of hot-dip galvanized sheet steel.
Consider
required straight distance after or before disturbance, as mentioned on
the card attached to the measurement nozzles, to obtain accurate flow
measurement.
By fully open the damper, one get access to the duct. Do not forget to readjust the damper after cleaning.