How to test whether a cleanroom meets the Class 100,000 standard?
Cleanliness Standards for Class 100,000 Cleanrooms: Determining whether cleanliness meets standards requires a multi-faceted approach, including indoor air supply volume, total fresh air volume, static pressure difference, average cross-sectional wind speed, cross-sectional wind speed non-uniformity, air cleanliness level, airborne and settling bacteria, indoor temperature and relative humidity, and indoor noise level. The following example illustrates the testing process in a beverage workshop. The primary cleanliness standards monitored by food companies are the quantities of settling and airborne bacteria, as these have the greatest impact on food production. This beverage and food workshop employed the settling bacteria measurement method.
Settling Bacteria Measurement Method: Settling bacteria refer to bacteria carried in dust that has settled on the ground or object surfaces. With the aseptic workbench open, take several sterile petri dishes (90 mm inner diameter). Aseptically pour approximately 15 liters of melted and cooled nutrient agar medium (to 45°C) into each dish. Invert the dishes and incubate at 30-35°C for 48 hours to confirm sterility. Place the petri dishes with nutrient agar medium in a designated area approximately 1 meter above the ground (generally one dish per 10 square meters). Expose them to air for 30 minutes, collect settling bacteria, replace the lids, and incubate at 30-35°C for 48 hours. Count the bacteria. The workshop should be in an operational state. A settling bacteria count of 10 or less per dish meets the standards for a Class 100,000 cleanroom.
Generally, settling bacteria monitoring is sufficient once a month. Commonly used instruments in cleanroom engineering include temperature and humidity meters, digital anemometers, infrared thermometers, differential pressure gauges, multi-functional sound level meters, particle counters, and airflow meters. These are standard real-time monitoring devices used to help determine whether a Class 100,000 cleanroom standard is met.
Cleanrooms require continuous monitoring and strict operating procedures. Achieving the Class 100,000 cleanroom standard is indispensable, ensuring the clean space offers numerous advantages such as safety, energy efficiency, and human-centered design, leading to better operation and creating a superior living and working environment.
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