How to determine whether the filter of the blast shower needs to be replaced?

To determine whether the filter of the explosion-proof air shower needs to be replaced, you can start with the following aspects:
Resistance change
Observation differential pressure meter: An explosion-proof air shower room will generally install a differential pressure meter, used to show the pressure difference between the two sides of the filter. When the reading of the differential pressure meter reaches or exceeds the design final resistance value of the filter, it usually means that the resistance of the filter has increased to a certain extent, the filtration efficiency may be affected, and the filter needs to be replaced. With different types and specifications of the filter, the design of the final resistance value is different, the final resistance of the general initial effect filter is about 200-400Pa, and the final resistance of the medium effect filter is about 400-600Pa, and the final resistance of the high-efficiency filter can reach 800-1200Pa.
Feel the change in wind speed: When the air shower is running normally, stand near the outlet to feel the wind speed. If it is obvious that the wind speed is much weaker than before, even if the differential pressure meter reading has not reached the final resistance value, it may be that the filter blockage causes the resistance to increase so that the excessive flow of gas is reduced, at this time, it is necessary to further check whether the filter needs to be replaced.
Filtering effect
Observation cleanliness: The air shower room is mainly used to remove impurities such as dust on the surface of personnel or materials. If it is found that after the air shower, there is still more dust on the surface of personnel or materials or the visible dust in the air shower room is significantly increased, indicating that the filtration effect of the filter is reduced and may need to be replaced.
Detection of particle concentration: A professional particle counter can be used to detect the particle concentration of the air outlet or indoor air in the air shower. If the detected particle concentration exceeds the cleanliness standard of the air shower design, for example, for the air shower requiring 10,000 degrees of cleanliness, the test finds that the number of particles greater than 0.5μm per cubic meter exceeds 10,000, it may be necessary to replace the filter to ensure the purification effect of the air shower.
Appearance condition
Check the dust accumulation: Open the access door of the filter and directly observe the dust accumulation on the surface of the filter. If there is a large amount of dust accumulation on the surface of the filter or even if some areas have been completely covered by dust, it indicates that the filter has accumulated more impurities, the filtration capacity may have decreased, and it needs to be replaced in time.
Check the damage: carefully check the filter paper or filter screen for damage, tearing, and other phenomena. Even if the surface area of the filter is not much dust, as long as there is damage, it will lead to unfiltered air directly through, affecting the filtration effect, and the filter must be replaced immediately.
Service time
Reference replacement cycle: In general, the replacement cycle of the primary filter is 3-6 months, the medium filter is 6-12 months, and the high-efficiency filter is 1-2 years. However, this is only a rough reference, and the actual use needs to be combined with the above resistance changes, filtering effects appearance conditions, and other factors. If the air shower is used frequently or the environment is dusty, the replacement cycle of the filter may be shortened accordingly.