DOP leak detection principle for efficient filter

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The high efficiency filter leak detection PAO generator upstream of the filter dust usually use the photometer (photometer) detection filter on downstream aerosol concentrations to determine the filter whether there is leakage. The purpose of the dust is only detected in the case of dust particle counter efficiency fil ter upstream lower concentration of dust particles, the more difficult to find a leak, and the need to add of dust can easily find a leak.bag filter manufacturers Artificial aerosol DOP nearly 40-year history, a period of time has been arrested on suspicion of carcinogenic effects are now often to DOS (Dioctylsebaeate sebacate Xin fat), also known as DEHS [di (2-ethylexyl) sebacate as an additive and PAO (polyaphaolefin Poly a olefin) instead, but the experimental method is still known as the "DOP Act. Atmospheric dust due to its concentration changes with location and time, sometimes larger, sometimes lower, generally do not have as leak detection with. The FDA pointed performing leak detection, aerosol chosen should meet certain physical and chemical requirements cause microbial contamination should not be used, resulting microbial growth aerosol. PAO generator can be divided into the heat generating and cold two kinds, the heat generator is using the principles of the evaporated condensed evaporator is atomized aerosol particles with a heater, and condensed under specific conditions into tiny droplets, and removed through the big and too small droplets leave the DOP of about 0.3um mist into the air duct, the particle size distribution in the 0.1 to 0.3um. Cold generator refers to the use of compressed air drum bubbles in the liquid states of matter dispersed phase DOP aerosol splash laskin nozzle produces the largest distribution of particle size in 0.65um. Leak detection filter scan often cold the DOP detection instrument, there are two, one is the aerosol photometer, another particle counter used in high efficiency filter leak detection instrument aerosol photometer (hereinafter referred photometer), is a forward scattering linear photometer, by a vacuum pump, a light scattering chamber, photomultiplier tubes, signa l processing converter and microprocessor and other components. Its working principle is: When the air flow vacuum pump to the light scattering chamber, where the particulate matter to scatter light to a photomultiplier tube. The photomultiplier tube, the light is converted into an electrical signal, this signal is amplified and digitized by the microprocessor after analysis, thereby measuring the intensity of scattered light. By comparison with the signal generated by the reference substance, it is possible to directly measure the mass concentration of particulate matter in the gas, so its use is widespread. Particle counter test value reflects the concentration of the number of particles in the gas stream! Tablets "and provides that the particle size range of its high sensitivity, aerosol applicable for all dust source, greater choice, but in the high efficiency filter Leak in less use of two instruments test results is difficult to quantify the contrast.glass fiber