Cross section flowmeterMeasurement principle: Under the premise of sufficient straight pipe sections and a certain regularity of airflow distribution in the pipeline, if the flow velocity inside the pipeline is stable and accurate, then the flow velocity distribution in the pipeline is a large flow velocity that continuously changes from zero on the pipe wall to the center of the pipeline. Therefore, in the intermediate process of change, there can always be a point where the measured flow velocity is the average flow velocity. However, in actual work sites, due to the limitation of straight pipe sections, the airflow distribution in the pipeline is uneven, and the actual wind speed distribution does not have a certain rule to follow. However, the cross-section for measuring flow velocity can be divided into many small unit areas Ai. Assuming that the flow velocity within each unit area is Vi, the total flow rate is equal to the sum of the flow rates flowing through multiple small unit areas. This method is called the velocity area method. The standardization organization has widely used this method and developed corresponding measurement specifications. The more the unit area is divided, the more accurate the measured flow rate should be. The cross-sectional flow meter is designed based on this principle and has been proven in practical applications.

　　Cross section flowmeterThe main characteristics are:

1. No straight pipe section is required, as long as there is an installation position of 250mm to 300mm in length.

2. The outflow coefficient is stable and does not require calibration.

3. Low pressure loss and small volume.

4. A blowing device can be installed to achieve manual or automatic blowing.

5. It can measure the flow rate of pipelines with special structural shapes.

6. For situations where the flow field of the medium fluctuates greatly, install a rectifier grid in front of the equipment.