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How does the PORTACOUNT work?

April 26, 2017portacount

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How does the PORTACOUNT work?

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The PORTACOUNT works by measuring the concentration of microscopic dust particles in the ambient air and then measuring the concentration of those dust particles that leak into the respirator. The ratio of these two concentrations is called the fit factor. The HEPA filter cartridges stop essentially all the particles so anything that gets into the mask must have come through the face seal. See Application Note ITI-048 PORTACOUNT Plus Theory of Operation.