VRE active
Variable flow rate controllers VREactive
Measuring principle
Contrary to conventional measuring techniques, the differential
pressure is notmeasured through a series-connected element such as an orifice plate. Instead, differential pressure measured by two cup-shaped elements mounted in the damper blade area.
Placing the damper blade in the throttle position creates a „jet effect”, which is concentrated with reduced flow rates and higher throttle settings. This results in increased air speeds at the measuring point even with lower duct air speeds allowing for relatively high and very precisely measurable differential pressures.
With this measuring principle, the highest control accuracy of all known systems is achieved evenwith very low air speeds.
Using this technique, flow rate control depends on two values, the differential pressure and the damper blade position.
