Do you know the precautions for the air volume hood?

The air volume hood is a detection tool used to detect and debug the air volume of the air conditioner, the air volume of the suction air, and the air supply volume of the high-efficiency air outlet of the clean room. The air volume hood can detect the air volume of various air outlets, For data such as wind speed, pressure, humidity and temperature, the data of each air outlet needs to be detected in the clean room of many pharmaceutical factories and electronics factories. The air volume hood can quickly read the detection and display the detection data in real time.
 
No matter what brand of air volume hood can effectively detect some relevant data of various types of air outlets, the use of the air volume hood is almost the same, but when using the air volume hood, you need to pay attention to some matters. Today we will explain in detail the precautions for the use of the hood.
 
1. When using the air volume hood to detect the relevant data of the air outlet, we need to select the appropriate size cover. The detection of the air volume hood is to cover the various air outlets through the cover of the air volume hood to perform the corresponding detection. If the air volume hood When the size difference between the cover body and the air outlet is large, it will cause a large measurement error. Therefore, when selecting the air volume cover body, the size of the air outlet should be selected for measurement. There is a steel industry testing standard here, which is the air volume cover body. The length of the long side of the tuyere shall not exceed 3 times the length of the long side of the tuyere; the area of the tuyere shall not be less than 15% of the boundary area of the cover. And when using, the air volume cover should cover the tuyere, the tuyere should be in the center of the air volume cover, and the whole air volume cover should cover the entire air volume cover. At this time, if the Jiaye air volume cover is used, it can pass through the transparent window of the cover body. Design, you can clearly see the connection between the inner air volume cover and the air outlet to ensure that no air leakage occurs in this place.
 
2. When the air volume hood detects the air outlet, the data will be displayed on the display screen of the air volume meter. When reading the data, the detection data should be stable before reading, so as to ensure the accuracy of the detection data.
 
3. Back pressure compensation When the air volume of the air outlet is large, the resistance of the air volume cover and the throttling of the measuring part to the air outlet will increase, causing the air volume to drop more. In order to eliminate the low air volume of this part of the air outlet, it is necessary to carry out back pressure compensation. When the air volume value is less than or equal to 1500 m3/h, no back pressure compensation is required, and the air volume value read is the air volume value of the measured air outlet; when the air volume value is greater than 1500 m3/h, the back pressure compensation baffle is used for back pressure compensation. Reading the displayed value of the air volume meter is the measured air volume value after tuyere compensation.