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How to measure air volume flow?

Sensors in an HVAC environment

A balanced ventilation system supplies fresh air to the building while stale air is extracted from the building. To check whether there is sufficient ventilation, the supply of fresh air must be measured and regulated. The amount of fresh air supplied into the building or the air volume flow of fresh air must therefore be measured. Air volume flow is usually measured in m³ per hour.
Air flow or volume flow can be measured with HPS or DPS series of differential pressure sensors. To regulate air flow requires a differential pressure controller.
Following accessories can be used to connect the sensor to the air duct where the airflow is to be measured: 
PSET-PVC-200 can be used to measure differential pressure [Pa]. If the K-factor of the fan is known, it can also be used to control air volume flow.
PSET-PTS-200 can be used to measure air velocity [m/s]. If the duct cross section is known, it can be used to control air volume flow. By multiplying air velocity by the cross section area of a duct, the sensor calculates the air volume flowing past a point in the duct per unit of time.
  Air volume flow 
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