How to distinguish between empty state, static state and dynamic state of ULPA cleanliness test? Interpretation of personnel activities and results

The air state, static state and dynamic state of ULPA filter cleanliness testing correspond to different facilities, equipment and personnel status, and should be clearly defined and recorded in the project. Results from different states cannot be directly compared without explanation. The difference between the three states is not just 'whether there are people': the empty state means that the facility is completed, the equipment is not running, and there are no personnel; the static state is that the equipment is installed and running, and there are no personnel; the dynamic state is the normal production state, the equipment is running, and the personnel are operating. The conditions, particle sources and airflow distribution are different, and the measured results are naturally different. Comparing data from different states together, or using empty state data to infer dynamic performance, will lead to erroneous conclusions. Aili Industry isFFU fan filter unit andDuring the debugging and delivery of the fan filter unit at the EFU equipment end , the operating parameters can be recorded according to the status defined by the project.The FFU computer group control system records the equipment operating mode to facilitate correspondence between test data and actual status.

1. Confirm the regional status during testing: the definitions and boundaries of the three statuses

Empty state, static state and dynamic state respectively involve conditions such as facility completion, equipment configuration and operation, and personnel operation, and should be confirmed according to applicable definitions and agreed procedures.

Empty state usually means that the clean room or equipment has been installed and the system is running but no equipment is running and there are no personnel; static means that the equipment is installed and running but there are no personnel; dynamic means normal production, equipment operation, and personnel operation. The definitions of the three states in the standards may be slightly different, and projects should indicate the adopted definitions in the technical agreement. Aili Industry isWhen HEPA/ULPA filters are delivered, we can cooperate with the project party to clarify the applicable test status at each stage.ULPA ultra-high efficiency filters correspond to different status requirements. The installation leak detection and cleanliness testing of The relationship between levels and filtering requirements can be found inISO cleanliness level comparison。

2. Record activities that affect pollution: equipment movements, door openings, and number of personnel

Equipment movement, door opening, number of people, materials and process exhaust will all affect dynamic performance. You cannot just write a state name without on-site conditions.

The same 'dynamic' equipment has different operating frequencies, different door opening times, and different number of personnel, so the measured particle concentration may be very different. If the test record only writes 'dynamic qualified', it will be impossible to determine what operating conditions this result corresponds to later. Aili Industry isEFU equipment end 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 the operating mode and equipment status. During the test, the number of personnel, door opening status and equipment operation status can be recorded according to actual conditions. For the condition records of dynamic testing on the device side, please refer toEFU FAQ and technical support。

3. Distinguish the purpose of verification: installation integrity and clean area classification are two different things

ULPA installation integrity and clean area particle classification are different items. Static compliance does not presume that the protective effect in production activities has been verified.

The installation leak test verifies the integrity of the filter element and sealing interface, while the cleanliness classification test verifies the particle concentration level in the area. The two test objects are different and the judgment basis is different. The static cleanliness is qualified, indicating that the regional particle concentration reaches the standard without personnel, but it cannot explain the performance of personnel operations and equipment actions during production. Aili Industry isThe ULPA ultra-high-efficiency filter leak detection is based on full coverage of the filter surface and sealing surface, and the cleanliness test is performed according to regional sampling rules, and the two are recorded separately;The FFU computer group control system records partition operating parameters to facilitate data comparison under different states. For the distinction between verification projects, please refer toULPA ultra-high efficiency filter FAQ and selection guide。

4. If the results are normal after the static tester exits, but exceed the standard during production, the operation and equipment contamination should be checked.

If the results are normal after the static tester exits, but exceed the standard during production, the operation and equipment contamination should be further investigated, and it is not appropriate to just redo the static test. The difference between static and dynamic conditions usually comes from three aspects: dust generated by personnel activities, particles generated by equipment movements, and air flow exchange caused by opening doors and material transfer.

Aili Industry isNon-standard ULPA filters andIn the equipment-side solution of the EFU equipment-side fan filter unit , local protection methods can be evaluated based on the operator's operating position and equipment action range. If necessary, local reinforcement or air flow direction adjustment can be used to reduce the risk of contamination in a dynamic state. For directions on how to improve dynamic performance on the device side, please refer toHEPA FAQs and Selection Guide。

5. Related questions and answers

Is an empty pass sufficient to deliver?
The acceptance status and projects agreed upon by the project should be looked at, and a single status cannot be used to replace all requirements.

Is the difference between static and dynamic just whether there are people or not?
Not just. Equipment movements, door openings, material transfers, and process exhaust all affect dynamic performance, which do not occur under static conditions.

Can the static qualification mean that the dynamic one is also qualified?
cannot. Personnel activities and equipment movements under dynamic conditions introduce new sources of pollution, which need to be assessed individually.

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 andDuring the debugging and delivery of the fan filter unit at the EFU equipment end , the operating parameters can be recorded according to the status defined by the project.The FFU computer group control system records the equipment operating mode to facilitate correspondence between test data and actual status.HEPA/ULPA filter delivery can be accompanied by clear testing status applicable to each stage.of ULPA ultra-high efficiency filter correspond to different status requirements;The installation leak detection and cleanliness test The EFU equipment-end fan filter unit can confirm the airflow change nodes according to the equipment action sequence.Non-standard ULPA filters andThe EFU equipment-side fan filter unit equipment-side solution can evaluate local protection methods based on personnel operating positions and equipment action ranges. 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.