For controlling variable and constant air flow rates in ventilation and air-conditioning installations.

The volumetric flow controller regulates the implemented flow rate either constantly or variably. Positive control toVmin, Vmax or “Closed” is possible. The measuring crosses each comprising 12 measuring points, distributed in accordance with the median line method, enable a very accurate measurement of the air volume throughput. The error of measurement is ± 5% of the rated volume.

• For supply and return air systems.
• For constant CAV or variable VAV systems.
• For volumetric flow and linear pressure control.
• In differential pressure range 50 - 1000 Pa.
• Housing leakage according to DIN EN 1751, class C, at a duct pressure of up to 1000 Pa.
• Leakage with closed damper blade according to DIN EN 1751, up to class 4, at a duct pressure of up to 1000 Pa.
• With DD varnish coating for aggressive media.
• For regulating the air velocity in the duct in the range 1(2)-12 m/s (electric).