N.68 – The ideal m/s speed of the impact air on agar surface of active air sampler

TRIO

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).

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