The purpose of DOP leak detection for high-efficiency filters in laminar flow cabinet

1. Purification effect and installation replacement of laminar flow ultra clean workbench:

If there are defects in the high-efficiency filter and its installation, such as small holes in the filter itself or small cracks formed by loose installation, it will lead to the failure to achieve the predetermined purification effect. Therefore, after the installation or replacement of high-efficiency filters, it is necessary to perform leak detection on the filters and installation connections.

2. Purpose of leak detection

By testing the leakage rate of the high-efficiency filter, defects in the high-efficiency filter and its installation were discovered in order to take remedial measures.

3. Leak detection range

Clean areas, laminar flow ultra clean workbenches, and high-efficiency filters on equipment.

4. Leak detection method

The commonly used method for leak detection is the DOP method (which uses DOP solvent as the dust source and cooperates with an aerosol photometer (Suzhou Hongrui PM-350) for leak detection), or the dust particle counter scanning method (which uses atmospheric dust as the dust source and cooperates with a particle counter for leak detection). Due to the cumulative reading of the particle counter, it is not conducive to scanning and the inspection speed is slow; In addition, on the upwind side of the tested high-efficiency filter, the atmospheric dust concentration is often low, and it is necessary to supplement smoke to easily detect leaks. The particle counter method for leak detection can precisely compensate for these shortcomings, so the DOP method is widely used for leak detection.