Clean room refers to the removal of particles, harmful air, bacteria and other pollutants in the air within a certain space, and the control of indoor temperature, cleanliness, indoor pressure, air velocity and air distribution, noise, vibration, lighting, and static electricity In a certain range of needs, and given a specially designed room. That is to say, no matter how the external air conditions change, the room can maintain the original set requirements of cleanliness, temperature, humidity, and pressure. In order to correctly evaluate the construction quality of the project, the clean room cleanliness level (empty/static) should be measured. Test method and matters needing attention:
1. The dust particle counter has a particle size sensitivity of 0.3um and must be calibrated before testing. There should be no more than 3 indoor measurement personnel. The personnel must wear clean overalls and stand still or move slightly on the leeward side of the sampling point.
2. Set the measurement period to more than 2 minutes, and move as gently as possible when the measurement point changes. This is to minimize the impact of abnormal disturbance of the surrounding air caused by the walking of the tester or the handling of the test instrument.
3. Determine the minimum number of sampling points and take it according to the following formula. The principle is that the larger the area, the more measurement points. One-way laminar flow refers to the area of the air supply surface, and turbulent flow refers to the area of the room. When there is only one sampling point in the clean area, sampling should be done at least 3 times at this point.
4. The sampling port of the one-way flow clean room should be facing the direction of the air flow, and the sampling port of the turbulent flow clean room should be upward. The sampling speed should be as close as possible to the indoor airflow speed.
5. For a one-way flow (laminar flow) clean room, measure the number of particles debugged on the indoor working surface 0.6m away from the door when the door is open.
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