What are the advantages of the DOP in-place test over attempting a leak test with a particle counter ?
To begin with, it is not possible to use DOP with a particle counter-the concentration of aerosol is so high that the counter becomes saturated and jams, requiring a trip to the factory for repairs (except where expensive high volume samples with a diluting air source, are employed). The DOP test tells the story right away-where the leaks are and how great. There are no time delays for readouts or probe recovery. The readouts relate to filter performance and not to an abstraction.
