The Difference Between a Volume Hood and an Anemometer
Often customers will ask: Are the air volume hood and the anemometer the same product? What is the difference between the air volume hood and the anemometer?
First of all, the air volume hood and the 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 of the return air outlet. It is mainly composed of three parts: the air volume cover 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 big horn, and concentrate the air to the average wind speed sensor on the base. A wind pressure sensor is installed on the wind speed uniformity, the sensor reflects the change of the wind speed, and adopts the pitot tube type principle to automatically detect the wind pressure at multiple points and time points, calculate the air volume according to the size of the base, and generate the average air volume ( m3/h). The display of the air volume hood adopts PDA, the large-screen LCD display is intuitive, and the data of wind speed, wind temperature and air volume can be obtained directly, and the recording time interval can be set for continuous parameter recording in order to analyze the data (Hongrui Technology’s new air volume hood ACH-II , enter the size of the air outlet, and the wind speed can be automatically converted).
2. The anemometer is based on the measurement of wind speed, 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 flow velocity measurement range 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 probe of the anemometer is used for accurate measurement of 0 to 5m/s; the impeller probe of the anemometer is ideal for measuring the flow velocity of 5 to 40m/s; and the pitot tube can get the best results in the high speed range. An additional criterion for the correct selection of the flow rate probe of the anemometer is the temperature. Usually, the temperature of the thermal sensor of the anemometer is about ±7°C. The impeller probe of the special anemometer can reach 35°C. Pitot tubes are used above ±35°C.
Anemometers generally measure at a single point. Sometimes a tuyere needs to measure multiple points, or even more than a dozen points. The average wind speed can only be obtained through the conversion of the cross-sectional area. Therefore, some customers will prefer the air volume hood when choosing, but the specific choice should be based on the actual situation. environmental judgment.
