How to Choose Air Flow Hood and Anemometer
The airflow hood is mainly composed of three parts: the airflow hood body, base, and PDA. How to select the airflow hood and anemometer
The air volume hood is mainly used to collect air volume and collect it onto the air speed homogenizer on the base. A wind pressure sensor is installed on the uniform wind speed, which reflects the changes in wind speed. The air volume meter adopts the principle of a pitot tube to automatically detect the wind pressure at multiple points and multiple time points. Then, 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, and the recording time interval can be set for continuous parameter recording for data analysis. The measured and recorded data is recorded on a storage card and will not be lost. It can be transmitted to a PC through the computer's serial port for further applications.
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 measurements from 0 to 5m/s; The rotary probe of the anemometer has the most ideal effect in measuring flow velocities ranging from 5 to 40m/s; And using a pitot tube can achieve the best results in the high-speed range. An additional standard for selecting the flow rate probe of an anemometer correctly is temperature, which is typically used at temperatures of approximately+-7 for the thermistor sensor of the anemometer ˚ C. The rotor probe of a specially designed anemometer can reach up to 35 ˚ C. Pitot tube for+35 ˚ Above C.
Anemometers usually measure from a single point, and the accuracy of the test data is not high. When eddy currents or jets are generated at the air outlet, the wind speed is not very accurate, and it takes several points, even more than ten points, to obtain the average wind speed at a single air outlet. If there are several efficient air supply outlets, it is very troublesome and requires a lot of time to test and calculate based on the area of the air outlet, but the accuracy is not enough. Therefore, in strict dust-free places, air flow hoods are the most suitable choice
