The ideal m/s speed of the impact air on agar surface of active air sampler
The indications of the ISO 14698 about the ideal m/s speed of the air that impacts on the agar surface of an active microbial air sampler are quite general.
– Flow rate: sufficiently high to ensure the detection of low levels of contamination but weak enough to not dehydrate excessively agar medium;
– Flow velocity and impact: sufficiently high to be sampled microorganisms of size less than 1 micron and sufficiently weak to avoid damage during the impact;
– The accuracy and effectiveness of the sampling: ability to sample microorganisms size different without changing its vitality;
– Use, cleaning and disinfection, dependence on any accessories: you prefer simple sampler, to facilitate cleaning and sterilization, with programming intuitive interfaces;
– A possibility that aspirating cycle results in an increase of microorganisms in the air to be monitored: the air in output must not contaminate the environment and must not be sucked in again by the sampler. A HEPA filter could be used with the air that is coming from outside the Clean Room (e.g. compressed air).