a) Procedure â… -Dust blowing
Procedure I is used to study the adaptability of equipment to the effect of dust blowing (≤149μm);
b) Procedure II-Sand Blowing
Program Ⅱ is used to study the adaptability of equipment to the effect of sand blowing (150μm ～ 850μm);
c) Procedure III-Dustfall
Procedure III is used to study the dust reduction (≤105μm) for equipment (usually electrical equipment) in covered or enclosed areas (such as offices, laboratories, storage rooms and tents) where there is almost no air flow and dust can accumulate for a long time )Impact. Dust reduction can also affect the heat dissipation of equipment that has accumulated dust on the top surface. The dust reduction test is also used to check the quality of the air filter at the entrance of the air pollution sampler for outdoor use.
temperature
Unless otherwise specified in the sand and dust test chamber, the temperature of the sand blowing and dust blowing test is the working high temperature or storage high temperature obtained from the temperature response of the test piece in the high temperature test (GJB 150.3A), and the temperature of the dust falling test is 23 ℃ ± 2 ℃.
Relative humidity
High relative humidity may cause agglomeration of dust particles. Therefore, the sand and dust test box should control the relative humidity of the test box to not exceed 30% for the sand blowing and dust blowing test and the dust reduction test.
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