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Methods for testing the cleanliness of air filters in clean rooms
Methods for testing the cleanliness of air filters in clean roomsThe use of various air purification equipment in industrial production is now commonplace.Methods for testing their cleanliness. I. Classification of test methods 1. Air test: generally used for the clean room has been completed, the purification system has been in the normal operation state, indoor no process equipment and production personnel can be carried out under the circumstances of the test. 2. Static test: used for clean room purification air conditioning system has been in normal operation, process equipment has been installed, and no indoor production personnel under the circumstances of the test. II. Preparation before the test 1. Clean the clean room and its purified air conditioning system thoroughly. 2. Leak detection test of the high-efficiency air filter using a light scattering particle counter. III. Content of the test 1. The total air supply, return, fresh air and exhaust air volumes of the equipment. 2. Pressure values of the clean room. 3. The section air speed and airflow direction of the laminar flow clean room. 4. Cleanliness of the clean working area. 5. Adjustment of indoor temperature and humidity and their control ability. 6. Noise in the clean room. IV. Light scattering particle counting method This is one of the more commonly used techniques in testing, the main method consists of the following steps: 1. Care must be taken to ensure that it is clean and that there are no leaks in the connections. 2. The length should be set according to the permissible length of the instrument. 3. The flow rate at the sampling port should be close to the average air velocity of the clean room section. 4. The testers should be on the downwind side of the sampling port. V. Arrangement of test data 1. The data of each measurement point should be collated under the condition of stable operation of the test instrument for three consecutive samplings, and the average value should be taken as the actual test value. 2. For the number of dust particles greater than or equal to 0.5 microns, we need to determine the large value of each measurement point for the laminar flow clean room and the average value of each measurement point for the turbulent flow clean room. |
