RESEARCH REQUIREMENTS FOR THE FILTER PATRONES OF A BREATH PROTECTOR

摘要

An end-of-service indicator for use with a respirator cartridge, the end-of-service indicator having an optical fiber (10) having two opposite extremities, one of the extremities (21) being connected to a light source (31), the other of the extremities (23) being connected to a detector (41) which measures the intensity of light transmitted by the fiber. An alarm (51) is connected to the detector and is triggered when the intensity of light measured by the detector is below a predetermined level. An important aspect of the end-of-service indicator is that at least a portion of the optical fiber is porous. In use, the end-of-service indicator is placed inside a respirator cartridge (100) having a gas/vapor sorbent (101), so that when the respirator cartridge is used in a toxic environment, the gas/vapor sorbent gradually becomes saturated, thereby lowering the transmission properties of the optical fiber.