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Why won the PORTACOUNT allow fit testing if the ambient particle count is below 1000 particles per cubic centimeter?

April 26, 2017Ambient cubic fit particle particles portacount Testing

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Why won the PORTACOUNT allow fit testing if the ambient particle count is below 1000 particles per cubic centimeter?

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If the ambient particle concentration is below 1000 particles per cm³ the number of particles that leak into the mask may not be sufficient to make an accurate measurement. An ambient particle concentration that low is rare. Usually it indicates that the PORTACOUNT is running low on alcohol.