RESPIRATOR CARTRIDGE WITH SERVICE LIFE INDICATOR

摘要

A rotationally adjustable respirator cartridge (10) having a self-contained end of service life indicator (50) adjacent the interior of a sidewall (14) of the cartridge shell (12) and in contact with the filter medium )32) provides a color-changing display field (54) that is visible to the wearer of the respirator through a transparent portion (15)of sidewall (14). Display window (66) is defined by opaque border area (64) that surrounds sensor display field (54) and obscures a predetermined portion of the downstream end of the indicator (50) to provide a desired margin of safety to the weare r. In order to permit the wearer to rotationally position the color-changing display field (54) in the line of sight through the transpare nt portion (15) of the respirator facepiece, cartridge (10) is provided with a rotatable mounting assembly that is continuously rotatable i n one direction and that forms a seal with the cartridge shell (12).