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Frequently Asked Question - Definition of Common Cleanroom Terms
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Leak Penetration When using a photometer, measured leak penteration is the photometer response when the probe is stationary over a leak, divided by the photometer response upstream of the filter. when using a discrete particle counter, leak penetration is the concentration of particles counted when the probe is staionary over a leak, divided by the concentration of particles that would be counted upstream of the filter in the same time if the counter could sample upstream. Measures leak penetration depends on the photometer or discrete particle counter flow rate. The leak can be defined as the portion(percentage) of the test instrument's sample flow that passes unfiltered through a defect in the filter or filter medium |
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