High efficiency filter is generally refers to the particle size greater than or equal to 0.3um particle trapping efficiency of 99.97% or more of the filter, for the clean end of the pharmaceutical enterprise workshop filter device to provide clean air. Whether the clean room can achieve and maintain the cleanliness of the design to a certain extent and KLC air filter performance and its installation, such as the filter itself has small holes or not tightly installed to form small cracks, will lead to less than the scheduled purification Effect, affecting product quality. Therefore, after the installation or replacement of the high efficiency filter, it is necessary to leak the filter and the installation connection. By testing the leakage of the high efficiency filter, it is found that the high efficiency filter and its installation defects lie in order to take remedial measures.
High efficiency filter leak detection method commonly used dust particle counter scan (that is, the use of atmospheric dust as a dust source, and particle counter with leak detection) and DOP leak detection (that is, using DOP solvent as a dust source, and aerosol photometer with Leak detection). Dust particle counter reading scanning method has the advantage of low cost, simple operation; less than this method is the cumulative reading is not conducive to scanning, inspection speed is slow; In addition, the measured high efficiency filter on the wind side, often the atmospheric dust concentration Low, difficult to find leaks in the upper reaches of the dust source can not meet the requirements of the concentration of particles with a particle counter scan, easy to produce missed inspection. Relative to the dust particle counter reading scanning method, DOP method leak detection method cost is higher, the operation is more complex; advantage is that it can make up for the above problems of particle counter method leak detection, leak detection accuracy is high. It is widely used abroad DOP leak detection;
