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Key components of clean benches
Key components of clean benches(I) FiltersThe filter is one of the core components of the clean bench. It is mainly used to capture dust particles and various suspended solids of 0.3um and below in the air, with a filtration efficiency of up to 99.99%@0.3um. As the last line of defense for dust particles to enter the clean work area, the performance of the high-efficiency filter and the quality of its installation are directly related to whether the clean bench can meet the requirements. The pre-high-efficiency filter plays an important role in protecting the terminal high-efficiency filter or ultra-high-efficiency filter. Under normal circumstances, the high-efficiency filter can be used for about 2-3 years. However, the specific replacement time needs to be determined according to the actual use. For example, it can be determined by checking whether the high-efficiency filter has its differential pressure gauge, or by using a particle counter to measure. When the final resistance is reached (generally the initial resistance is about 200PA, and the final resistance is about 400-450PA) or the particles exceed the standard, it needs to be replaced. (II) Fans The fan plays a vital role in the clean bench and can be called its "heart". Generally, a fan system with adjustable air volume is used. By adjusting the operating conditions of the fan, the average wind speed in the clean work area can be kept within the specified range to meet the needs of aseptic operation. The fan pumps the air in the box, so that it circulates and renews continuously, ensuring the cleanliness of the work area. In different types of clean workbenches, the performance and function of the fan are also different. For example, in a vertical flow clean workbench, the fan can ensure the stable flow of air from top to bottom; while in a horizontal flow clean workbench, the fan provides power for horizontal laminar air supply to prevent cross-contamination of samples. (III) Workbench The workbench is the area where the operation is directly carried out, and its material and design are very important. Common workbench materials include wood plastic veneer, stainless steel, etc. Stainless steel countertops have the advantages of corrosion resistance and easy cleaning, which can reduce cross-contamination. The flatness and stability of the workbench will also affect the accuracy and comfort of the operation. For example, a shock-absorbing separated workbench can reduce the impact of vibration on the operation, and a quasi-closed countertop can effectively prevent the induction of external gas and the harm of odor in the operation area to the human body. In addition, the size and shape of the work surface also need to be selected according to actual operational needs. |
