How to determine whether the filter in the FFU needs to be replaced?
When maintaining and servicing a removable FFU, you can use the following methods to determine if the filter needs to be replaced:
I. Observe the appearance of the filter
1. Color change
- If the surface of the filter becomes black or gray, this may indicate that it has absorbed a lot of dust and pollutants and needs to be replaced.
2. Damage or deformation
- Check whether the filter is damaged, torn, or deformed. Any physical damage may affect its filtering effect and needs to be replaced in time.
II. Monitor the pressure difference
1. Install a differential pressure gauge
- Install a differential pressure gauge at the air inlet and outlet of the FFU to monitor the change of the pressure difference regularly.
- When the pressure difference exceeds the set threshold, it usually means that the filter is clogged and needs to be replaced.
2. Compare historical data
- If there is previous pressure difference monitoring data, you can compare it. If the current pressure difference is significantly higher than the previous level during the same period, it means that the resistance of the filter has increased and may need to be replaced.
III. According to the use of time
1. Refer to the manufacturer's recommendations
- The filter manufacturer usually provides a rough usage time recommendation. For example, for a general-use environment, a HEPA filter may be recommended to be replaced every 6 to 12 months.
2. Adjustment based on actual use
- However, the actual use time should be adjusted according to the specific use environment and frequency of use. If it is used frequently in a highly polluted environment, it may need to be replaced more frequently.
IV. Testing air quality
1. Using professional instruments
- Professional air quality testing instruments can be used to test the quality of air after FFU filtration.
- If the air quality does not meet the standard, the filter may need to be replaced even if the filter appearance and pressure difference look normal.
V. Wind speed and air volume measurement
1. Measuring wind speed and air volume
- Regularly use an anemometer to measure the wind speed at the FFU outlet, or measure the air volume through an air volume hood.
- If the wind speed or air volume drops significantly, it may be caused by filter blockage and needs to be replaced.
For example, in a clean room of a pharmaceutical factory, maintenance personnel regularly check the data of the differential pressure gauge and compare it with previous records. If the pressure difference rises rapidly in a short period, they will immediately check the appearance of the filter, measure the wind speed and air volume at the same time, and comprehensively judge whether the filter needs to be replaced. For example, in a dust-free workshop of an electronics factory, due to the extremely high requirements for air quality, in addition to monitoring the above indicators, professional air quality detection instruments are also used regularly to ensure that the filter can effectively filter tiny particles in the air.
In short, through the comprehensive judgment of the above multiple methods, it can be more accurately determined whether the filter of the detachable FFU needs to be replaced to ensure the normal operation of the FFU and good air purification effect.
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