SERVICE LIFE END DISPLAYING SYSTEMS FOR MULTI-LAYER FILTERING CARTRIDGES Russian patent published in 2017 - IPC B01D53/04 B01D35/143 A62B7/10 A62B19/00 

FIELD: technological processes.

SUBSTANCE: invention is intended for removal of contaminants from gas medium. Filtering cartridge has leak-tight housing including gas inlet, filtration material and gas outlet. Filtration material has multilayer structure, containing sorbent first layer, sorbent second layer, located is closer to gas outlet, than sorbent first layer, and sensor element adjoining sorbent first and second layers with provision of sensor element indicator location at sorbent first and second layers interface. Sorbent first layer is characterized by higher absorption capacity and/or higher rate of adsorption, than sorbent second layer. Filtration method comprises provision of filtering cartridge, provision of gas flow passing through filtering cartridge, sensor element reaction detecting and filtering cartridge replacement.

EFFECT: providing early user warning on cartridge replacement.

21 cl, 3 dwg, 3 tbl