How often should the PORTACOUNT be re-calibrated or cleaned?
If the only aerosol you use it with is ambient air, your PORTACOUNT will not need cleaning more than once a year. The unit should zero using the supplied HEPA filter and pass the maximum fit factor test. TSI recommends annual cleaning and re-calibration. TSI will clean, re-calibrate and, if necessary, replace worn parts for a flat fee.
