Filter cartridge having cone of visibility for end-of-service-life-indicator (ESLI)

A filter cartridge 12 that includes a filter material 42, an end-of-service-life-indicator 40, a cartridge housing 22, and a window 38. The filter material 42 and ESLI 40 are disposed in the housing, and the ESLI 40 may be viewed through the window 38. The window 38 is configured such that the ESLI...

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Bibliographische Detailangaben
Hauptverfasser:	POIRIER, RICHARD J, HOLMQUIST-BROWN, THOMAS W, RAKOW, NEAL A
Format:	Patent
Sprache:	eng
Schlagworte:	DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING FIRE-FIGHTING HUMAN NECESSITIES INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES LIFE-SAVING MEASURING PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL PHYSICS SEPARATION TESTING TRANSPORTING
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Beschreibung
Zusammenfassung:	A filter cartridge 12 that includes a filter material 42, an end-of-service-life-indicator 40, a cartridge housing 22, and a window 38. The filter material 42 and ESLI 40 are disposed in the housing, and the ESLI 40 may be viewed through the window 38. The window 38 is configured such that the ESLI 40 can only be seen within a cone defined by an angle of 20 to 70 degrees. The limited viewing range precludes reader error when examining the ESLI for color change.