How to arrange the ULPA scanning leak detection path? Speed, overlap and coverage

The scanning path of the ULPA filter should cover the specified filter surface, edges and installation seals, and the speed, distance and connection of adjacent scanning zones should be controlled according to the method. The purpose of path planning is to reduce omissions, not just shorten detection time. The arrangement of scanning paths has several dimensions: which areas are covered, how the probe moves, how fast it is, how much overlap between adjacent paths, and how to deal with corners. Improper handling of any one of these dimensions may make the scan appear to be done but actually miss something. Aili Industry isThe HEPA/ULPA filter inspection process determines the scanning path according to the filter element structure and sealing form. The supporting inspection tooling and the filter frame are matched in the same system. Scanning accessibility is confirmed in the structural design stage, instead of waiting for the inspection to figure out the solution.

1. Define the complete scanning range: the filter surface, glue seams, corners and installation seals must be covered

According to the diagram of the filter element and the box, identify the glue seams, corners, pressing parts and possible blocked areas to make it clear which interfaces belong to this test.

The scanning range is not a general concept of 'the entire filter element'. The center of the filter surface, the edge of the media, the glue seams, the corners of the outer frame, the installation sealing surface and the vicinity of the pressing parts all have different leakage risk points and need to be covered separately. Aili Industry isDuring the detection of ULPA ultra-high-efficiency filters , the scanning area is defined according to the filter element structure. The factory leak detection covers the filter surface, glue seams and frame seals. The installation system leak detection is based on the box interface diagram at the project site to supplement the corner and joint areas. The relationship between levels and filtering requirements can be found inISO cleanliness level comparison。

2. Control the movement conditions of the probe: speed, distance and sampling flow are executed according to the method

Set up the scan according to the probe size, sampling flow rate and prescribed method, and keep the steering and edges under control. You cannot speed up the process arbitrarily to meet the schedule.

If the scanning speed is too fast, the sampling volume will be insufficient when the probe passes through the leakage point, and the signal may be missed; if the scanning distance is too far, the concentration of particles captured by the sampling port will decrease, and the sensitivity will decrease. Aili Industry isDuring the detection of ULPA ultra-high-efficiency filters , the scanning speed and distance are fixed according to the method requirements. The scanning parameters are noted in the detection records. The same parameters are used during retesting to ensure that the results are comparable. For the coordination between sampling flow rate and instrument conditions, please refer toHEPA FAQs and Selection Guide。

3. Adjacent scanning strips must overlap, and the corners must be processed separately.

Adjacent scan strips should overlap as specified to avoid leaving unscanned narrow strips between the two paths. Positions such as corners, near fasteners, and inside the frame are difficult to cover with linear scanning tape, and separate paths need to be arranged.

Aili Industry isIn the inspection of non-standard ULPA filter projects, the scanning path is planned separately for the positions of special-shaped frames, heightened structures and stiffeners, and the inspection tooling and filter frame structure are designed to ensure that the corners and blocking positions are accessible. For requirements on scan overlap and corner processing, please refer toULPA ultra-high efficiency filter FAQ and selection guide。

4. Separate processing of abnormalities and omissions: record location, re-scan and restricted area

Record the location, re-scan and restricted areas, and re-inspect as required after rectification. Repeated scanning of the center cannot compensate for edge uncovering.

When encountering protruding fasteners or structural obstructions, the operation arrangement should be adjusted to cover the adjacent seals, rather than directly bypassing them and recording them as full inspections. Aili Industry separately marks the uncovered area and the adjusted rescanning range in the inspection record to ensure that the report can reflect the actual scanning coverage; if the project site inspection encounters structural obstruction, it can be combined withThe interface description of the fan filter unit on the EFU equipment side adjusts the detection plan. For the cooperation between sealing and scanning path, please refer toHEPA FAQs and Selection Guide。

5. Related questions and answers

Is bigger scan overlap better?
Method and coverage requirements should be met, and excessive repetition cannot compensate for unstable or unreachable working conditions.

What should I do if a fastener blocks the path?
The operating arrangement should be adjusted to cover the adjacent seal, and it cannot be directly bypassed and then recorded as a full inspection.

Can the scanning speed be adjusted based on experience?
It should be set according to the method requirements. Too fast speed will lead to insufficient sampling volume and missing signals. The same parameters should be used during retesting.

6. Related articles

ULPA ultra-high efficiency filter FAQ and selection guide

ULPA ultra high efficiency air filter

Non-standard customized ULPA ultra-high efficiency filter

HEPA FAQs and Selection Guide

7. Key points for selection and acceptance inspection

8. Product matching and technical support from Aili Industrial

Aili Industry isThe HEPA/ULPA filter detection process determines the scanning path according to the filter element structure and sealing form. The detection tooling and filter frame are matched in the same system, and the scanning accessibility has been confirmed in the structural design stage;The scanning speed and distance of the ULPA ultra-high-efficiency filter testing are fixed according to the method requirements. The scanning parameters are noted in the testing records. The same parameters are used for retesting to ensure comparability.The non-standard ULPA filter project plans separate paths for the locations of special-shaped frames, heightened structures and stiffeners, and the inspection records separately mark the uncovered areas and re-scanning ranges.The interface description of the fan filter unit on the EFU equipment side can be adjusted according to the on-site inspection plan. 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.