The difference between air volume hood and anemometer
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 can also measure the air volume at the return air outlet. It mainly consists of three parts: the air volume hood body, the base, and the support rod.
The air volume cover is mainly used to cover the air outlet, collect the air volume like a loudspeaker, and concentrate the air onto the average wind speed sensor on the base. A wind pressure sensor is installed on a uniform wind speed surface, which reflects changes in wind speed and uses the pitot tube principle to automatically detect wind pressure at multiple points. The air volume is calculated based on the size of the substrate to generate an average air volume (m3/h). The display of the air volume hood adopts PDA, with a large LCD screen for intuitive display. The data of wind speed, temperature and air volume can be directly obtained, and the recording time interval can be set for continuous parameter recording for data analysis.
2, Anemometer is an instrument that measures wind speed as its basic function and 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 anemometer: The measurement range of 0100m/s flow velocity can be divided into three sections: low speed: 05m/s; Medium speed: 540m/s; High speed: 40100m/s. The thermal sensitive probe of the anemometer is used for measuring at a speed of 05m/s; The blade type probe of the anemometer has an ideal effect on measuring a flow velocity of 540m/s; By using a pitot tube, good results can be achieved within the high-speed range. An additional criterion for correctly selecting the flow velocity probe of an anemometer is temperature, and typically the temperature range for the thermal sensor of an anemometer is around ± 7 ℃. The impeller probe of the specially designed anemometer can reach 35 ℃. Pitot tubes are used for temperatures above ± 35 ℃.
Anemometers generally measure at a single point, and sometimes multiple points, even dozens of points, need to be 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 air volume hoods when choosing, but the specific selection still needs to be judged according to the actual environment.
