What should I do if the number of particles downstream of ULPA suddenly increases? Alarm evidence and pollution location

If the number of particles downstream of the ULPA filter suddenly increases, the alarm time and operating evidence should be retained to distinguish filter element leakage, installation bypass, process dust production, air flow changes and measurement abnormalities. You cannot change the core directly based on only one alarm point. Sudden rise and slow rise are two different problems: slow rise usually points to dust accumulation in the filter element or seal aging, while sudden rise often points to event causes - the door is opened, a certain piece of equipment moves, the seal fails instantaneously, or there is a problem with the measurement system. The cause of the event requires evidence and cannot be guessed based on experience. Aili Industry isFFU fan filter unit andthe fan filter unit at the EFU equipment end , online monitoring data and leak detection records are managed separately.In the control scheme of The FFU computer group control system records alarm time points, operating status and air volume parameters. When an abnormality occurs, multiple data in the same time window can be retrieved for comparison to help determine whether the alarm is real pollution or measurement or changes in working conditions.

1. First confirm that the alarm is valid: check the instrument, pipeline and sampling status one by one.

Check the particle size channel, sampling flow rate, pipeline and instrument status, and check whether there is a power outage, communication or sampling position change, to avoid taking data anomalies as real pollution.

The first response to the alarm should be 'This alarm is not credible', not 'The filter element is broken.' Readings may suddenly increase if the particle counter is powered off and restarted, the sampling pipe falls off or bends, the data jumps after communication is interrupted, or the sampling position is moved. Aili Industry isThe HEPA/ULPA filter matching plan explains the normal reading range of the monitoring point.The FFU computer group control system can record the instrument status and communication status. When alarming, first check the instrument status to confirm whether the reading is generated under valid conditions. For the method of judging the effectiveness of the alarm, please refer toHEPA FAQs and Selection Guide。

2. Correspond time to process events: Alarms in fixed periods often point to operations

Check the door opening, personnel operations, equipment movements, material transfer and fan settings, and observe whether there is a fixed time period or local location correlation.

The correspondence between alarm time points and process events is an important clue for locating the cause. If the increase in particle count always occurs a few minutes after the equipment door is opened, the problem may come from the air flow exchange when the door is opened or the entry of external contamination; if it always occurs when the robotic arm is in motion, it may be from particles generated by the movement of the mechanism; if it always occurs after a certain shift or a certain operation step, it may be related to human operations or materials. Aili Industry isEFU equipment side fan filter unit, the air flow change nodes can be confirmed according to the equipment action sequence.In the The FFU computer group control system records alarm time, equipment operating status and access control signals to facilitate comparison of particle data with event sequences. For timing analysis of device-side exceptions, please refer toEFU FAQ and technical support。

3. Narrow the scope based on evidence: check air volume, pressure and integrity in order

Check the air volume and pressure, and then check the integrity and pollution sources as needed. After processing, compare the results under the same working conditions and record the basis for recovery.

The alarm is valid and the time is correct. Next, we need to determine whether it is a 'leak', a 'production' or a 'failed delivery'. A decrease in air volume may indicate an increase in filter resistance or a fan problem; a change in pressure may indicate a change in system sealing or air flow path; an integrity check can confirm whether there are leaks on the filter element body and installation seal; and a pollution source investigation can confirm whether there are new dust-generating points. Aili Industry isULPA ultra-high efficiency filter leak detection covers the entire filter surface and sealing surface.The air volume, pressure difference and alarm data of the FFU computer group control system are related by point. During the investigation, they can be eliminated one by one in the order of 'air volume-pressure-integrity-pollution source'. For the checking order and data association, please refer toULPA ultra-high efficiency filter FAQ and selection guide。

4. Particle peaks always appear after the equipment door is opened. It is necessary to focus on checking the door opening action and air flow boundaries.

Particle peaks always appear after the equipment door is opened. The focus should be on checking the door opening action and airflow boundaries, rather than just improving the filter element level. Opening the door will change the air flow path inside the equipment, external air may enter briefly, and internal dust may also be brought out. Improving the filter element level cannot solve the problem of air flow exchange at the moment the door is opened.

Aili Industry isNon-standard ULPA filters andIn the ultra-thin EFU equipment-side solution, the boundary protection method can be evaluated according to the door opening direction and air flow path. If necessary, the air volume adjustment or air flow direction optimization can be used to reduce the exchange of pollution at the moment the door is opened, instead of asking the project party to directly replace a higher-grade filter element. For the relationship between equipment door opening and airflow boundary, please refer toEFU FAQ and technical support。

5. Related questions and answers

Can it be handled by increasing the wind speed first?
The reason should be confirmed first. Speed ​​increase may change pollution migration and equipment operation, and cannot replace positioning.

If the particle number suddenly rises, does it mean that the filter element is broken?
uncertain. Installation of bypasses, process dust generation, airflow changes and measurement abnormalities may cause elevated readings, and should be investigated one by one based on evidence.

What should you do first after calling the police?
First confirm the validity of the alarm, and then locate the cause based on process events and operating data. It is not advisable to replace the filter element directly.

6. Related articles

ULPA ultra-high efficiency filter FAQ and selection guide

FFU computer group control system

EFU FAQ and technical support

HEPA FAQs and Selection Guide

7. Key points for selection and acceptance inspection

8. Product matching and technical support from Aili Industrial

Aili Industry isFFU fan filter unit andthe fan filter unit at the EFU equipment end , online monitoring data and leak detection records are managed separately.In the control scheme of The FFU computer group control system records alarm time points, operating status, air volume parameters and communication status. When abnormal, multiple data in the same time window can be retrieved for comparison to help determine whether the alarm is real pollution or measurement or changes in working conditions.The HEPA/ULPA filter matching solution explains the normal reading range of the monitoring point.ULPA ultra-high-efficiency filter leak detection covers the entire filter surface and sealing surface.The air volume, pressure difference and alarm data of the FFU computer group control system are related by point.The EFU equipment-end fan filter unit can confirm the airflow change nodes according to the equipment action sequence.Non-standard ULPA filters andThe ultra-thin EFU device-side solution evaluates boundary protection methods based on the door opening direction and airflow path. Provide process objectives, installation drawings, operating conditions and acceptance requirements, and can further communicate ULPA standard specifications, non-standard interfaces, samples and batch matching. The specific parameters and test range are based on the confirmed model and technical documents.