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In modern industrial production and life, the importance of air quality is self-evident. In order to ensure that indoor air is clean and healthy, we often use high-efficiency filters to filter dust and suspended solids in the air. Even the best quality HEPA filters can have some level of leakage, which requires HEPA leak detection.
HEPA leak detection is a very important job that helps us find and solve problems with HEPA filters. Commonly used leak detection methods include sodium flame method, oil mist method, DOP method, fluorescence method and particle counting method. Among them, the DOP method is a widely adopted method.
The dop method uses 03 μm monodisperse dioctyl o-benzephthalate (DOP) droplets were used as test dust sources. The DOP liquid is heated into vapor and condensed into tiny droplets under specific conditions. By measuring the turbidity of the gas sample before and after the filter, it can be judged that the high-efficiency filter has a response to 03 micron dust filtration efficiency.
Before performing HEPA leak detection, we need to initialize the testing instrument and set a reference standard. Then, the upstream sampling tube is connected upstream to the HEPA and the concentration of the upstream aerosol is measured. Next, adjust the concentration of the resulting aerosol to 10 20ug ml as per the operational requirements.
The next step is the process of scanning and detecting leaks with high-efficiency filters. Filters can be leak detected using a count scan, a photometer scan, or a visual inspection of the smoke. The counting scanning method is suitable for all types of filters, while the photometer scanning method and the smoke wisp visual method are only suitable for high-efficiency filters.
In practice, we also need to pay attention to the following: determine whether there is any obvious leakage in the HEPA filter itself and its installation. This includes checking the filter media of the filter, the connection of the filter media to the inside of the frame, and the gaskets and mounting points of the frame.
After the HEPA filter is installed, we can turn on the combi air conditioner and use an aerosol photometer to scan the HEPA filter for leak detection. For leak detection, place the sampling port 2 3 cm away from the surface of the filter and scan at an appropriate speed.
Through HEPA leak detection, we can find and solve the problems of HEPA in time to ensure the quality and cleanliness of indoor air. This is of great importance for protecting people's health and improving productivity.