Volume flow rate measurement

A new measurement principle makes it possible to measure low volume flow rates. The pressure is measured by means of a nozzle with tappings upstream and downstream of the damper blade. The Compact controller of the LVC-LowVelocity determines the resulting pressure differential (effective pressure) and compares it to the stored characteristic.

The controller works extremely accurate even in case of unfavourable upstream conditions, e.g. if it is fitted directly on or close to the main duct. This is a great advantage where space is limited and hence valuable.

Volume flow rate control

The volume flow rate is controlled in a closed loop, i.e. measurement – comparison – control.

First, measurement takes place. The controller then compares the actual measured value to the setpoint value, which in most applications is received from a room temperature controller. In case of a deviation, the controller sends a signal to the actuator, and the actuator moves the damper blade accordingly.