How can I determine whether the Medium Efficiency Pocket Filter needs to be cleaned or replaced by monitoring the differential pressure?

1. The principle and significance of differential pressure
The differential pressure refers to the pressure difference between the air entering the filter and the air passing through the filter. When the air flows through the filter bag, particulate matter and pollutants are intercepted, while the air continues to flow through the filter bag and enter the exhaust duct of the equipment. Ideally, the flow of air should be smooth and the differential pressure should be low, which indicates that the air can pass through the filter smoothly and the filtering effect is good.
With the increase of use time, particulate matter, dust and harmful gases in the air will gradually accumulate on the surface of the filter bag, blocking its pores and causing air circulation to be restricted. The difficulty of air passing through the filter bag increases, resulting in an increase in the pressure difference at both ends of the filter. This phenomenon indicates that the filter is "overloaded" and needs to be cleaned or replaced.

2. How to monitor the differential pressure?
A special differential pressure gauge is installed in the Medium Efficiency Pocket Filter system to monitor the working status of the filter. The differential pressure gauge can display the pressure difference between the inlet and exhaust ends of the filter in real time. Once the differential pressure exceeds the set normal range (usually 1.5 to 2 times the differential pressure when the filter is initially used), it means that the filter has accumulated too much dust and needs to be cleaned or replaced. In order to ensure the efficient operation of the filtration system, it is very necessary to check the differential pressure gauge regularly and judge the status of the filter in time.
Some high-end equipment is also equipped with an automatic monitoring system, which can detect the differential pressure in real time through sensors and issue warnings to remind operators to perform maintenance in time. These intelligent monitoring methods can not only improve the detection efficiency, but also find problems at an earlier stage to prevent excessive dust accumulation from affecting the performance of the equipment.

3. Causes and manifestations of increased differential pressure
Pollutant accumulation: During the use of the filter, dust, smoke, bacteria, pollen and other particles in the air gradually accumulate on the filter bag. These particles will hinder air circulation and increase the difficulty of airflow through the filter. The more dust accumulates, the greater the increase in differential pressure, and the ventilation effect of the filter will decrease significantly.
Reduced air flow: As the pollutants on the surface of the filter increase, the resistance of the filter gradually increases, and the air flow will also decrease accordingly. If the filter is not cleaned or replaced for a long time, the overall air flow may be blocked and the differential pressure may increase. In this case, the efficiency and performance of the equipment operation will be affected, and the freshness of the air may decrease.
Aging or damage of filter bag material: In some harsh environments, the filter bag material of the filter may age due to long-term use or environmental factors (such as high temperature, high humidity, chemical corrosion, etc.), resulting in a decrease in the filtration efficiency of the filter bag. Even if there is no obvious dust accumulation on the surface of the filter bag, the aging material may affect the filtration effect and cause the pressure difference to increase.
Increased environmental pollution: Changes in the use environment will also affect the working state of the filter. For example, if the filter begins to be used in a dirtier or more polluted environment (such as increased industrial dust or more chemical gases in the air), its dust accumulation rate may accelerate, causing the filter pressure difference to increase more easily.

4. Countermeasures when the pressure difference increases
Timely cleaning: When the pressure difference of the filter is detected to exceed the normal value, it needs to be cleaned. Cleaning is the simplest and economical measure to keep the filter running effectively for a long time. Depending on the severity of the pollution, different cleaning methods can be adopted, such as manual cleaning, automatic cleaning or high-pressure air backblowing. By cleaning the dust accumulation, the ventilation performance of the filter will be restored, thereby reducing the pressure difference.
Replace the filter: If the pressure difference is still high after cleaning, it means that the filter bag has been seriously contaminated or aged, and it is difficult to restore its initial filtering effect. In this case, replacing the filter bag with a new one is the only option. Regularly replacing the filter can not only maintain good filtering performance, but also extend the service life of the equipment, and prevent equipment failure or further deterioration of air quality due to filter damage.
Check other parts of the system: In addition to the filter itself, other parts of the system, such as fans, pipes, and air inlets, may also affect the increase in pressure difference. If the pressure difference is still large after cleaning or replacing the filter, check whether other parts are blocked or damaged to ensure the normal operation of the entire system.
Establish a maintenance cycle: In order to avoid the problem of increased pressure difference, the equipment and filters should be maintained according to a certain cycle. According to the working environment and load of the filter, a regular cleaning or replacement plan can be formulated to prevent the filter from being used for a long time without cleaning, resulting in a decrease in filtering effect and an increase in pressure difference.