How to use an anemometer for airflow measurements
Measurement of anemometers in ducts
Practice has proven that the 16mm probe of the anemometer is more widely used. Its size not only guarantees good permeability, but also can withstand a flow rate of up to 60m/s. Airflow velocity measurement in the pipeline as one of the feasible measurement methods, direct measurement protocol (gate measurement method) practical air measurement.
Second, the anemometer in the pumping exhaust measurement
Ventilation will greatly change the relative balance of airflow in the pipeline dispersion pattern: the formation of high-speed area on the outside surface of the self-vent, other parts of the low-speed area, and the formation of vortices on the grid. Depending on the design of the grille, the airflow cross-section is more stable at a certain interval (about 500px) in front of the grille. In this case, the measurement is usually carried out with a large anemometer caliber rotor. Because of the larger caliber may be uneven flow rate uniformity, and in a larger range of calculation of its uniform value.
Third, the anemometer in the pumping hole using volume flow funnel to implement measurement
Even if there is no grid in the pumping pre-disturbance, the path of air flow has no direction, and the cross-section of the airflow is extremely uneven. The reason for this is that the partial vacuum in the piping funnels the air out of the air chamber, and even in the area close to the extraction, there is no location that meets the measurement conditions for the measurement to be carried out. If measurement is performed using the gate measurement method with a uniform value calculation function, and measurement is performed using the volume flow rate determination method, and volume flow rate determination, etc., repeatable measurement results can be provided by the pipe or funnel measurement method. In this case, measuring funnels of different sizes are available to meet the application requirements. Application of the measuring funnel can be generated at a certain interval in front of the sheet valve to meet the conditions of flow rate measurement of a fixed cross-section, measured to locate the center of the cross-section and fixed cross-section, measured to locate the center of the cross-section and fixed cross-section, measured to locate the center of the cross-section and fixed in this. The measured value obtained by the flow rate probe is multiplied by the funnel coefficient to calculate the volume flow rate pumped.
