Clean room workshop testing requirements
Clean room workshop testing requirements
The clean room is generally a place where various parameters such as air cleanliness, temperature and humidity, pressure difference, fresh air volume and air filter performance are required. All air parameters meet the requirements of air cleanliness level; temperature and humidity...
Text label: clean room workshop, testing requirements, Zhongjing Global Purification
Clean clean room modular workshop testing requirements
The clean room is generally a place where various parameters such as air cleanliness, temperature and humidity, pressure difference, fresh air volume and air filter performance are required. All air parameters meet the requirements of the air cleanliness level; temperature and humidity should first meet the requirements of the production process. When the production process has no requirements for temperature and humidity, it needs to meet the thermal comfort of indoor personnel and the specific requirements of equipment storage for temperature and humidity; different levels The pressure difference between the clean room and the clean area and the non-clean area should not be less than 5Pa, the pressure difference between the clean area and the outdoor should not be less than 10Pa, the clean room and the surrounding space must maintain a certain pressure difference, and according to production Process requirements determine maintaining a positive or negative differential pressure.
Basic clean room tests measure various factors that enable successful particle control. These tests are used to evaluate the overall operational performance of a clean room and help identify its current cleanliness level; basic tests should be based on the certified items. The most beneficial sequence to perform, these tests are performed, and the grades are then graded at the appropriate level. Basic tests should include: wind speed and uniformity test, air volume and uniformity test, high-efficiency filter installation leak detection, indoor pressure test, suspended particle count cleanliness classification test. The selection test is aimed at clean room particulate matter, air flow and auxiliary systems for users to choose, including the following aspects: airflow parallelism test, self-cleaning time test, sound level test, illumination and uniformity test, vibration level test, temperature and humidity Uniformity test, conductivity test, electrostatic test, electromagnetic interference test, air change test, filter test bench scanning leak detection. For non-unidirectional flow clean rooms, when the reading is obtained at a distance greater than 150mm from the filter, the air volume method is given priority, and the air volume method is used to calculate the wind speed more accurately; when the measured wind speed is used to determine the air volume, measure the possible existing instruments and filters. The difference in time shall be dealt with by formulating a correction factor. Zhongjing Global Purification can provide consulting, planning, design, construction, installation, transformation and other supporting services for clean rooms and purification plants.
It is best to use an air volume hood for the air volume measurement of each filter, and an air volume hood with a flow meter is required; the air volume hood should be tightly pressed on the filter frame to prevent air leakage; the air volume hood should be large enough to capture Total air flow through the filter under test; measure and record air volume per filter in liters per second or cubic feet per minute. For the wind speed and uniformity test, the measurement area must be a cross-sectional area of u200bu200ba room or work area with normal airflow, and the cross-sectional area should include the entire work area or the entire room; to measure and record the speed of each grid point, care must be taken to maintain airflow in the sampling area There is no obstacle during measurement, and some instruments may need to use a bracket; the measurement time should be at least 5S, or the minimum time specified by the instrument, and the average value of the above time will be used as the measurement result.
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