Information about anemometer measurements
1. Measurement of air flow velocity in pipelines. Practice has proven that the 16mm probe of an anemometer is the most versatile. Its size not only ensures good permeability, but also can withstand flow rates up to 60m/s. As one of the feasible measurement methods, air flow velocity measurement in pipelines, indirect measurement procedures (grid measurement method) are suitable for air measurement.
2. The measurement vent in the air extraction and exhaust will greatly change the relatively balanced distribution of air flow in the pipe: a high-speed area will be generated on the surface of the free vent, and the remaining parts will be low-speed areas, and a vortex will be generated on the grid. Depending on the different design methods of the grid, the airflow cross section is relatively stable at a certain distance (about 20cm) in front of the grid. In this case, measurements are usually made using a large anemometer's aperture wheel. Because a larger diameter can average unbalanced flow rates and calculate their average value over a larger range.
3. When measuring the air extraction hole, even if there is no grid interference at the air extraction area, the air flow path has no direction, and the air flow cross section is extremely uneven. The reason is that the partial vacuum in the pipeline draws the air into the air chamber in a funnel shape. Even in the area very close to the air extraction, there is no position that meets the measurement conditions for measurement operations. Only pipe or funnel measurement methods can provide reproducible measurement results, such as using a grid measurement method with averaging function and using it to determine the volumetric flow rate. In this case, measuring funnels of different sizes can meet the usage requirements. A measuring funnel can be used to generate a fixed section that meets the flow rate measurement conditions at a certain distance in front of the sheet valve. Measure and locate the center of the section and fix the section. Measure and locate the center of the section and fix it. Measure and locate the center of the section and fix it. Here it is. The measured value obtained by the flow rate probe is multiplied by the funnel coefficient to calculate the pumped volumetric flow rate. (e.g. funnel coefficient 20)
