ISOLATING APPARATUS WITH CHEMICALLY BOUND OXYGEN Russian patent published in 1997 - IPC

FIELD: respiratory technics. SUBSTANCE: in apparatus containing, placed in casing 1, regenerative cartridge 2, respiratory sack 4 with excessive-pressure valve 5, and exhaustion indicator, the latter is constructed in the form of normally disconnected contacts 7 interacting with valve 5 and connected to time relay. Contacts 7 may be fixed on casing 1 or on valve 5 or its pull rod. EFFECT: increased reliability owing to increased accuracy in indicating exhaustion of regenerative cartridge. 3 cl, 1 dwg