Pioneer in valve industry
Professional filter measuring instrument for photometer
Release time:
2024-04-07
The testing steps of professional filters need to be mastered and applied step by step. Today, we will analyze the specific process for you from nine steps. I believe you will have more confidence in the use of the equipment after reading.
First, the dust source used in the professional filter test is 0.3mm monodisperse DOP droplets, in which the "amount" is the turbidity of the air containing DOP.
The instrument 2. the measurement is a photometer.
At the beginning of the 3. test, the DOP liquid is heated into steam, which will condense into tiny droplets in a specific environment, leaving only about 0.3mm of particles after removing the excessively large and small droplets, and the mist DOP enters the air duct.
4., the turbidity of the gas sample before and after the filter can be measured to determine the filtration efficiency of the filter for 0.3mm dust.
The 5. DOP method has a history of more than 50 years so far, and it has been a commonly used method in measuring the performance of filtration equipment in the world.
6. can also obtain DOP droplets of other particle sizes by changing the dust generation parameters. 20 years ago, the 0.1mmDOP method for measuring ultra-high efficiency filters was modified in European and American countries, and the measuring instrument was also changed to a condensation nucleus laser particle counter.
7. everyone may worry that the dust used in the test will pollute the filter, the manufacturer will use the dust that the customer thinks does not pollute the filter during the test. For example, semiconductor chip factories do not like sodium salt, oil mist and DOP, and often require manufacturers to use solid particle dust that they think is safe. Pharmaceutical factories require the direct use of outdoor atmospheric dust measurement filters.
8., we should pay attention to sampling before and after the filter. The salt-containing mist sample makes the color of the hydrogen flame blue and increases the brightness, and the salt spray concentration of the air is judged by the flame brightness, so as to determine the filtration efficiency of the filter to the salt spray.
9. the average diameter of salt spray particles is 0.4mm according to the national standard, the measured results of existing devices in China are about 0.5mm.
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