专业滤光片用光度计测量

　　Professional filter test steps are needed step by step after mastery and use, and today we will analyze the specific process from the nine steps for you, I believe that after reading you will have more confidence in the use of equipment.
　　First, the professional filter test using the dust source for the 0.3mm single-dispersed phase DOP droplets, which the “amount” for the DOP-containing air turbidity.
　　The measuring instrument is a photometer.
　　Third, the beginning of the test, the DOP liquid will be heated into a vapor, the vapor in a particular environment will condense into tiny droplets, remove too large and too small droplets, leaving only about 0.3mm particles, the fog DOP into the air duct.
　　Fourth, next you can measure the turbidity of the gas sample before and after the filter, thus determining the filter efficiency of the filter on the 0.3mm dust.
　　Fifth, DOP method so far has a history of more than 50 years of development history, was the international measurement of the performance of filtration equipment in the commonly used methods.
　　Sixth, by changing the dust parameters can also get other particle size DOP droplets, and in Europe and the United States 20 years ago to measure the ultra-high-efficiency filters 0.1mm DOP method of transformation, the measurement instrument has been changed to a condensation laser particle counter.
　　Seven, you may be concerned about the test dust will contaminate the filter, so the manufacturer will use the customer in the test that does not contaminate the filter dust, for example, semiconductor chip factories do not like sodium salts, oil mist, DOP, and often require manufacturers to use solid particles of dust that they believe that the safety of the; and pharmaceutical factories require the use of outdoor atmospheric dust directly in the measurement of the filter.
　　Eight, it should be noted that before and after the filter were sampled, containing salt spray gas samples so that the color of the hydrogen flame blue, increased brightness, and the brightness of the flame to determine the concentration of salt spray in the air, in order to determine the filter efficiency of the filter on the salt spray.
　　Nine, in accordance with national standards for salt spray particles with an average diameter of 0.4mm, but at present the measured results of existing domestic devices are about 0.5mm.