Vaporized Hydrogen Peroxide VHP Resistance Testing for IsoAir Particle Counters
Knowledge Category: Air
Cleanroom Design Questions & Answers
This FAQ paper is a follow up to the webinar, “3rd Annual Cleanroom Design and Engineering Forum” presented by Anna Campanella. Many thoughtful questions were asked about non-viable particle counting requirements in cleanrooms and sampling placement pertaining to process design. Questions submitted during and after the webinar are answered by Anna Campanella, below. If you have any additional queries for our experts, submit them directly here.
Understand and Mitigate Variability in Particle Counter Results
Establishing and maintaining cleanroom performance of aerosol particles in a cleanroom often requires the use of multiple particle counters with varying design parameters and display settings. Commonly, cleanroom personnel employ the use of multiple optical particle counters (as defined in ISO 14644-1) to report an array of airborne particle counts. This paper is a summary of the basic methods cleanroom personnel may use to ensure that the data that is reported by different aerosol particle counters can be compared effectively. This is accomplished by making sure differences are understood and appropriate data conversions can be made to make meaningful comparisons.
Understanding ISO 21501-4
ISO 14644-1:2015 introduces the need for particle counters calibrated to ISO 21501-4. The calibration methods assure data accuracy and repeatability. The methods outlined in ISO 14644 and ISO 21501-4 represent an important step in more accurate evaluations of cleanroom contamination and improved process control.