What is the required upstream aerosol level for leakage testing?
Most current standards and recommended practices require a minimum of 10 micrograms per liter (ug/l) as an upstream aerosol challenge. While higher concentrations can be used, 10-ug/l is the minimum that may be used and still have a valid leakage certification test. All of ATI’s aerosol photometers were designed to operate at upstream challenge concentrations between 10 and 100 ug/l.
