The difference between air flow hood and anemometer
Often, customers ask: is the air volume hood and anemometer the same product? What is the difference between an air volume hood and an anemometer?
Firstly, the airflow hood and anemometer are two completely different products.
1、 The air volume hood is an instrument used to measure the air volume flowing through various air supply outlets and diffusers, and to measure the air volume at the return air outlet. It mainly consists of three parts: the air volume hood body, base, and support rod.
The air volume hood is mainly used to cover the air outlet, collect air volume like a large horn, and concentrate the air onto the average wind speed sensor on the base. A wind pressure sensor is installed on the uniform wind speed, which reflects the changes in wind speed and adopts the principle of pitot tube to automatically detect the wind pressure at multiple points and multiple time points. The air volume is calculated based on the size of the substrate, resulting in an average air volume (m3/h). The display of the air volume hood adopts PDA, and the large LCD screen displays intuitively. Data on wind speed, temperature, and air volume can be directly obtained. The recording time interval can be set for continuous parameter recording for data analysis (Hongrui Technology's new air volume hood ACH-II can automatically convert wind speed by inputting the air outlet size).
2、 The anemometer is an instrument with the basic function of measuring wind speed, which can be widely used in heating, ventilation, air conditioning, environmental protection, meteorology, clean workshops, chemical fiber textiles, various wind speed laboratories, and other occasions.
The use of anemometers: The measurement range of flow velocity from 0 to 100m/s can be divided into three sections: low speed: 0 to 5m/s; Medium speed: 5 to 40m/s; High speed: 40 to 100m/s. The thermal sensitive probe of the anemometer is used for precise measurement from 0 to 5m/s; The blade wheel probe of the anemometer has an ideal effect in measuring flow velocities ranging from 5 to 40m/s; By using a pitot tube, good results can be obtained in the high-speed range. An additional standard for selecting the flow rate probe of an anemometer correctly is temperature, which is typically used by the thermal sensor of the anemometer at a temperature of approximately ± 7 ℃. The impeller probe of the specially designed anemometer can reach 35 ℃. Pitot tubes are used above ± 35 ℃.
Anemometers are generally measured at a single point, sometimes multiple points, or even more than ten points, are measured at a single air outlet. The average wind speed can only be obtained by converting the cross-sectional area. Therefore, some customers may prefer an air volume hood when choosing, but the specific selection still needs to be based on the actual environment.
