Hello all. I'm trying to perform airborne particle counter calibration, but I have found troubles to count 5 microns sized particles in the aerosol. I use a Model 256 Royco aerosol generator. No problem with particle size 0,3 microns to 3 microns. I have try to calibrate Met One and Climet counters with the same result. When I generate 5 microns particle aerosol the count is erratic, with no pattern, and with just a few particles counted. Any help welcomed. Regards MetroBioCen
Hello there!
I am certainly not an expert or anything; but I'll give it a try.
I guess I'm trying to figure things out here. Are you suggesting that you have an aerosol generator that is supposed to emit .3µ, .5µ, 3µ and 5µ particles.
You have two calibrated particle counters (a Met One and a Climet) and neither one of them are picking up the 5µ particles?
Now, is this when it is in free standing, testing the setup, or is it when you are challenging the HEPA filter?
If it is while you are challenging the filter, I would surmise the filter is removing the large particles. If it is free standing, then either there is an issue with the generator, or something is hinky with the two particle counters.
5µ particles should be fairly easy to pick up, if they are present