The application of DOP in the filter leak detection

Filter leak test required by dust source is 0.3mm monodisperse DOP droplets. "Quantity" of air containing DOP turbidity. The instruments for the measurement of dust photometer (photometer). With gas samples to determine the difference between the turbidity of the dioctyl phthalate particle filter filtration efficiency.

DOP liquid into steam for heating, under certain conditions, the steam condenses into tiny droplets, removing too high and too small droplet particles left after about 0.3mm, mist into the air duct DOP. After measuring the sample gas filter turbidity, and thus determine the dust filter for filtration efficiency 0.3mm.

DOP method has been 50 years of history, this method is used to measure the efficiency filter internationally the most commonly used method. Early on, people think 0.3mm dust filter for filtering the hardest, so the requirement to use 0.3mm Dust measurement efficiency filter.

DOP containing benzene, people doubt its carcinogenic properties similar to so many laboratories use alternative but without the benzene ring, such as DOS, but test method is still called "DOP Act."

By changing the parameters of dust, you can get the other particle size dioctyl phthalate droplets. So there will be over 20 years ago, Europe and the United States measure 0.1mm DOP efficiency filter method, sometimes measuring instruments also changed condensation nuclei laser particle counter. Some foreign manufacturers have been marked for 0.05mm or 0.03mm DOP filtration efficiency, that are commercially without scientific basis unconventional.

Measuring efficiency filter DOP method, also known as "hot dioctyl phthalate method." This corresponds to a "cold DOP" refers to the Laskin nozzle (item polydisperse DOP produced dust filters in the scan test, people often use cold DOP.

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