Device and method for indicating exhaustion of a filter

B - Operations – Transporting – 01 – D

Patent

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Details

B01D 53/30 (2006.01) A62B 18/08 (2006.01) A62B 23/00 (2006.01) B01D 46/42 (2006.01) G21F 9/02 (2006.01)

Patent

CA 2279655

A device for indicating exhaustion of a gas filter that is filled with an adsorbing agent (3) is described, said device incorporating a hazardous-gas detector (14) that detects a hazardous gas content at a sampling point (8) within the adsorbing agent (3). The device according to the present invention is characterized by a reference sampling point (12) that is located in the vicinity of a gas-entry point (6) of the gas filter (2), the hazardous gas detector being so designed that it determines the hazardous-gas content at each sampling point (8, 12) in turn, and determines filter exhaustion by comparison of the hazardous gas content at the sampling point (8) with the hazardous-gas content at the reference sampling point (12).

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