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How to determine whether the HEPA filter needs to be replaced?
How to determine whether the HEPA filter needs to be replaced?To determine whether the high-efficiency air filter of the anti-static ultra-clean workbench needs to be replaced, it can be considered from many aspects such as operating parameters, appearance, and actual effects, and the specific methods are as follows:Observe operating parameters Wind speed reduction: Use an anemometer to regularly measure the wind speed of the outlet of the ultra-clean table. In general, when the wind speed is reduced to 70%-80% of the initial wind speed, the high-efficiency air filter is likely blocked, resulting in a reduction in ventilation, and it needs to be replaced. Increased pressure difference: The ultra-clean workbench is usually equipped with a pressure difference meter to show the pressure difference between the two sides of the filter. When the pressure difference is increased by 50%-100% compared to the initial value, it means that the resistance of the filter is significantly increased, and the filtration efficiency may have decreased, and the filter should be replaced at this time. Abnormal fan sound: During normal operation, the sound of the fan is smooth and even. If the fan is heard making abnormal noise or the sound is significantly louder, it may be because the filter resistance increases, the fan needs more power to maintain the airflow, which may also be a signal that the filter needs to be replaced. View appearance condition Color change: Open the filter compartment door of the ultra-clean workbench and observe the surface of the HEPA filter. If it is found that the surface of the filter is black or there is a large amount of dust accumulation, it indicates that it has adsorbed a large number of pollutants, and the filtration effect will be affected and needs to be replaced. Damage: Carefully check whether the filter paper and the frame of the filter are damaged, cracked, or deformed. Once it is found that there is damage, even if the filter has not been used before, it should be replaced immediately, because the damage will lead to unfiltered air directly into the work area, affecting the purification effect. Evaluate the actual effect Cleanliness test: Use professional equipment such as a dust particle counter to regularly test the cleanliness of the air in the ultra-clean workbench. If the test results show that the number of dust particles in the air exceeds the prescribed standards, for example, in a 100-level ultra-clean workbench, the number of particles greater than or equal to 0.5μm per cubic meter exceeds 100, and other possible sources of pollution are excluded, the filtration effect of the high-efficiency air filter is likely reduced, and it needs to be replaced. Product quality feedback: In the production or experiment process, if the product is found to have more quality problems caused by pollutants such as dust, such as the short circuit of electronic chips, pollution in biological experiments, etc. after excluding other factors, the high-efficiency air filter should be considered whether it is invalid and needs to be replaced. |
