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Frequently Asked Question - Definition of Common Cleanroom Terms
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Designated Leak
A leak that should be detectable during scanning of a filter.
When using a photometer, a designated leak is characterized by a standard
leak penetration, which is the photometer reponse when the sampling
probe stationary over a leak, divided by the photometer response upstream
of the filter when using a 28.3L/min (1 ft3/min) photometer.
when using a discrete particle counter, a designated liak is characterized
by a standard leak penetration and by a designated number of counts
chosen to establish statistical probabilities related to its detection
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