A cleanroom is a controlled environment with an installation that removes airborne particles by air flow and does not introduce particles by this air flow. Not all particles > 5 µm are removed by air flow because of deposition on all surfaces. The number of particles that are not removed because of deposition increases with particle size (at 15 air changes: 50% for particles > 10 µm, 80% for particles > 25 µm and >90 % for particles > 40 µm).
The resulting air cleanliness for all particle sizes during operation (when people are working in the cleanroom) can be monitored by measuring the concentration of airborne particles up to 5 µm and by measuring the particle deposition of particles > 5 µm and the resulting surface cleanliness at critical locations.
This section is to read about contamination control and find information in our knowledge center. Go to cleanliness monitoring to read about our products, the technology, services and applications.
Monitoring particle deposition in cleanrooms has become much more accessible than in the past. Real-time monitoring gives useful information on the performance and use of a cleanroom or controlled environment and demonstrates directly when and how much products can be contaminated. In this section lessons learned over time, best practices, studies and analysis will be presented.