In the field of purification projects, the purification effect of cleanrooms is directly related to multiple key aspects such as product quality, production efficiency, and personnel health. Guangzhou Cleanroom Construction Co., Ltd., as an experienced enterprise in the purification industry, is well aware of the importance and complexity of evaluating the purification effect. The following will elaborate on the multi-dimensional key points for evaluating the purification effect of cleanrooms in detail.

Dust particles are one of the primary pollutants of concern in cleanrooms. Through professional dust particle counters, the number concentration of dust particles with different particle sizes in the workshop can be accurately measured. Generally speaking, according to the cleanliness level standards of cleanrooms, such as the ISO 14644 standard, different levels of workshops have strict concentration limits for particles with specific particle sizes such as 0.1 micrometers, 0.2 micrometers, 0.3 micrometers, 0.5 micrometers, and 5 micrometers. For example, in an ISO 5 cleanroom, the number of dust particles with a particle size of 0.5 micrometers should not exceed 3,520 per cubic meter. Regular detection of dust particle concentration and comparison with the standard values can directly reflect the dust pollution control level in the workshop, which is the basic indicator for evaluating the purification effect.

For industries that are sensitive to microorganisms, such as the food, pharmaceutical, and biotechnology industries, the content of microorganisms in cleanrooms is of vital importance. Tools such as airborne microorganism samplers and settle plate for microorganisms can be used to collect and analyze the number of airborne microorganisms and settleable microorganisms in the air of the workshop. For example, in the Grade A clean area of a pharmaceutical workshop, the number of airborne microorganisms should not exceed 1 per cubic meter, and the number of settleable microorganisms should not exceed 1 per plate. The determination results of microorganism content can reflect the degree of sterility in the workshop and are the key basis for measuring the purification effect in terms of microorganism prevention and control.

The air change rate directly affects the renewal frequency of the air in the workshop and the efficiency of diluting and removing pollutants. It is determined by calculating the ratio of the supply air volume to the volume of the workshop. Different purification levels require different air change rates. For example, in an ISO 7 cleanroom, the air change rate is usually 15 - 25 times per hour. Meanwhile, a reasonable airflow organization can ensure that the air is evenly distributed and effectively removes pollutants. Tools such as smoke generators can be used to visually observe the direction of the airflow and judge whether there are dead corners or short circuits in the airflow. The combination of a proper air change rate and an optimized airflow organization is a powerful guarantee for the purification effect.

Although temperature and humidity are not direct purification indicators, they have a profound impact on the environmental stability of the cleanroom and production. Excessively high or low temperature and humidity may lead to increased floating of dust particles, microorganism breeding, or affect the accuracy of the production process. For example, in an electronic chip manufacturing workshop, the suitable temperature is generally 22°C ± 2°C, and the relative humidity is 45% ± 5%. Through real-time monitoring and recording of data by temperature and humidity sensors and ensuring that the temperature and humidity are within the specified ranges, it helps maintain the stability of the overall purification effect.

The differential pressure control between different areas of the cleanroom is crucial for preventing the spread of pollutants. A certain positive or negative differential pressure should be maintained between adjacent areas. For example, a positive differential pressure of 10 - 15 pascals is generally maintained between the clean area and the non-clean area to prevent the air from the non-clean area from flowing back into the clean area. By regularly measuring the differential pressure between various areas with differential pressure gauges and ensuring that the differential pressure is stable within the design requirements, this is an important manifestation of the purification effect in terms of area isolation.

The cleanliness of the surfaces of equipment, walls, floors, etc. in the workshop should not be ignored. Methods such as using surface particle counters or taking swab samples for laboratory analysis can be used to detect the adhesion of dust particles and microorganisms on the surfaces. Smooth, clean, and dust-free surfaces are helpful in reducing the secondary release of pollutants and maintaining the overall purification level of the workshop.

The evaluation of the purification effect of cleanrooms is a comprehensive and systematic task that requires meticulous detection and analysis from multiple aspects. Guangzhou Cleanroom Construction Co., Ltd., relying on advanced testing equipment, a professional technical team, and rich industry experience, can provide customers with comprehensive and accurate purification effect evaluation services, helping customers continuously optimize the operation and management of cleanrooms and ensuring that they are always in an efficient and stable purification state, laying a solid foundation for the production of high-quality products.