Determination of temperature and humidity and airflow pattern in clean room
Determination of temperature and humidity and airflow pattern in clean room
Before the measurement of indoor air temperature and relative humidity in the clean room, the purification air-conditioning system has been running continuously for at least 24 hours. For places with constant temperature requirements, according to the requirements for the fluctuation range of temperature and relative humidity, the measurement should be carried out continuously for more than 8 hours. The measurement interval is small...
Text label: clean room engineering, clean room measurement, temperature and humidity measurement
Determination of temperature and humidity and airflow pattern in clean room
Before the measurement of indoor air temperature and relative humidity in the clean room, the purification air-conditioning system has been running continuously for at least 24 hours. For places with constant temperature requirements, according to the requirements for the fluctuation range of temperature and relative humidity, the measurement should be carried out continuously for more than 8 hours. The measurement interval is not more than 30min; according to the fluctuation range of temperature and relative humidity, the corresponding instrument with sufficient accuracy should be selected for measurement; indoor measurement points are generally arranged at the air supply and return air outlets, and representative locations in the constant temperature working area. Center and sensitive components; all measuring points should be at the same height, 0.8m from the floor, or arranged on several planes with different heights from the ground according to the size of the constant temperature zone. The distance between the measuring points and the outer wall surface should be greater than 0.5m.
Indoor airflow pattern detection, the purpose is to check whether the airflow pattern in the clean room meets the cleanliness. If the airflow pattern in the clean room cannot meet the requirements of airflow arrangement, the cleanliness in the clean room will not be or difficult. To meet the requirements; for a one-way flow clean clean room modular, one longitudinal and one transverse section is generally selected, and one measuring point is arranged on the horizontal plane with a height of 0.8m and 1.5m from the floor, and the distance between the measuring points is 0.2m-1.0m. It can also focus on the layout; for a horizontal one-way flow clean room, choose one section and one working area height level, and three cross-sections 0.5m away from the supply and return air walls and the center of the room; for non-one-way flow clean rooms For the room, you can choose to arrange the measuring points through the vertical and horizontal sections of the center of the representative air outlet and the horizontal plane of the working area height. 1.0m, and the measuring point should be arranged on the center line between the two tuyere. Zhongjing Global Purification can provide consulting, planning, design, construction, installation, transformation and other supporting services for clean rooms and clean workshops.
The detection of indoor planktonic bacteria and settled bacteria is an important means to ensure the air quality of the air-conditioning system. There are two detection methods: air suspension microorganisms and sedimentation microorganisms. The sampled substrates are cultured in a constant temperature box at 37°C and 48H. Counting after the production of bacteria, the sampling vessel and culture solution used must be disinfected and sterilized, and the sampling points can be arranged evenly or in a representative area; the suspended microorganism method should use centrifugal, slit and pinhole collisions. The sampling time should be determined according to the concentration of microorganisms in the air, and the number of sampling points can be the same as the number of measuring points for measuring air cleanliness; for the sedimentation microorganism method, a petri dish with a diameter of 90mm should be used, and the sampling should be carried out after settling on the sampling point for 30 minutes; During bacterial determination, the petri dish should be arranged in a representative location and a location with minimal airflow disturbance. The preparation of the sampling device before sampling and the treatment after sampling should be carried out in a negative pressure laboratory equipped with high-efficiency air filter exhaust. The temperature of the laboratory should be 22±2℃ and the relative humidity should be 50%±10 %; the sampling instrument should be sterilized, and the exhaust gas of the sampling device should not pollute the clean room; the number of sedimentation vessels, sampling points, culture medium, culture temperature, and culture time should be implemented in accordance with the relevant specifications; the sampling of planktonic bacteria samplers If the straightness is greater than 100L/min, the air velocity of the collision medium should be less than 20m/s.
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