Guide: PAO hot aerosol generator and PAO cold aerosol generator PAO aerosol generator can be divided into two types: heat generation and cold generation. The heat generator uses the principle of evaporation condensation, and the atomized aerosol particles are evaporated by a heater. And condense into tiny droplets under certain conditions, remove too large and too small droplets and leave about 0.3um of foggy PAO into the air duct, the particle size distribution is 0.1 ~ 0.3um. PAO detection leak source: PAO (polyaphaolefin polya olefin) US aerosol ATI PAO-4 CAS#68649-12-7ATI EMERY3004 The PAO cold aerosol generator refers to a polydisperse phase PAO aerosol which is bubbled in a liquid by compressed air and spattered by a laskin nozzle. The large distribution particle size of Zui is about 0.65 um. Cold PAOs are often used when scanning leaks on filters. The particle size of the hot smoke is 0.3 μm, and the particle size of the cold smoke is 0.55-0.65 μm. The PAO hot aerosol generator has a large concentration of hot fumes and is stable and stable. It is suitable for high efficiency filter leak detection under the air conditioning unit. The PAO cold aerosol generator has a small amount of cold smoke and is suitable for the performance test of a single high-efficiency filter. It is more practical when the biosafety cabinet, the FFU leak detector and the manufacturer do high-performance tests. PAO heat generator smoke: TDA-5C aerosol is heated to 380-390 ° C in the instrument, and it needs an external nitrogen bottle to blow out under the pressure of compressed air (can adjust the pressure) PAO cold generator cold smoke: PAO aerosol in the condensation shock occurs particles TDA-4B compressed gas: 3-9cfm (85-255L / min) 20psi; TDA-6C aerosol generator compressed air (built-in air compressor) For PAO cold-generating aerosol generators , the thermal aerosol test method can achieve higher aerosol (PAO) upstream concentration in a shorter time, and the upstream concentration is more stable and the dispersion is better. The higher the proportion of particles, the better the penetration, the disadvantage is that it requires sufficient dilution and cooling space, otherwise it will condense a large part of the aerosol on the surface of the high-efficiency filter, and may also affect the surface performance of the high-efficiency filter, so it is High-efficiency filter integrity testing with a circulating air volume greater than 15 000 m3/h is better. The disadvantage is that the upstream concentration is limited and the aerosol cannot reach a higher value. The cross-section wind speed has a great influence on the HEPA integrity test, and the larger the wind speed, the easier it is to penetrate. Relatively speaking, the effect of heat-generating aerosols is more pronounced. The PAO cold-generating aerosol generator test method is simpler. It can be tested only by controlling the pressure of the compressed air source, and the high-efficiency filter (HEPA) test installed on the Class II biosafety cabinet after reaching the upstream concentration value. The value is stable. The change of the test value caused by the change of the upstream concentration value is extremely small, and there is no condensation in the air due to the cold occurrence of the aerosol. The surface of the filter will not have oily polymer residue, which is suitable for small circulating air volume and small. Filter integrity testing performed in space. Ratched Tie Down,Ratchet Strap Tie Downs Kit,Heavy Duty Strap Kit,Cargo Ratchet Strap Tie Downs Kit Ningbo Zhihao Car Accessories Co.,Ltd. , https://www.zhihaoautoparts.com