Respirators with a sacrificial cartridge for end of service life indication
First Claim
Patent Images
1. A respirator service life indication system comprising:
- a breathing apparatus comprising an inlet port, and outlet port, and an air purifying element coupled to the inlet port for the breathing apparatus; and
a service life indicator arranged in a parallel flow configuration with the breathing apparatus such that the service life indicator has a separate inlet and outlet from the inlet port and the outlet port of the breathing apparatus so air entering the service life indicator through the inlet separate and apart from the inlet port of the breathing apparatus is exhausted to ambient environment through the outlet separate and apart from the outlet port of the breathing apparatus and does not contact or mix with air passing through the breathing apparatus, wherein the service life indicator comprises;
a sacrificial cartridge, anda sensor disposed downstream of the sacrificial cartridge and configured to detect a contaminant concentration above a predetermined threshold in an gas stream passing through the sacrificial cartridge.
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Abstract
A respirator service life indication system may include a breathing apparatus having an air purifying element; and a service life indicator arranged in a parallel flow configuration with the breathing apparatus. The service life indicator typically might have a sacrificial cartridge, and a sensor disposed downstream of the sacrificial cartridge and configured to detect a contaminant concentration above a predetermined threshold in a gas stream passing through the sacrificial cartridge.
35 Citations
20 Claims
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1. A respirator service life indication system comprising:
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a breathing apparatus comprising an inlet port, and outlet port, and an air purifying element coupled to the inlet port for the breathing apparatus; and a service life indicator arranged in a parallel flow configuration with the breathing apparatus such that the service life indicator has a separate inlet and outlet from the inlet port and the outlet port of the breathing apparatus so air entering the service life indicator through the inlet separate and apart from the inlet port of the breathing apparatus is exhausted to ambient environment through the outlet separate and apart from the outlet port of the breathing apparatus and does not contact or mix with air passing through the breathing apparatus, wherein the service life indicator comprises; a sacrificial cartridge, and a sensor disposed downstream of the sacrificial cartridge and configured to detect a contaminant concentration above a predetermined threshold in an gas stream passing through the sacrificial cartridge. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A powered air-purifying respirator service life indication system comprising:
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a powered air-purifying respirator comprising; one or more air purifying elements, and a blower assembly configured to draw a first air stream from an ambient environment through an inlet, pass the first air stream through the one or more air purifying elements, and pass the first air stream to a mask; a service life indicator comprising; a sacrificial cartridge, a sensor disposed downstream of the sacrificial cartridge, and a secondary blower assembly configured to draw a second air stream from the ambient environment through an inlet separate from the inlet of the respirator, pass the second air stream through the sacrificial cartridge and past the sensor, and pass the second air stream back to the ambient environment through an outlet separate from an outlet of the blower assembly; and an indicator device configured to present an indication from the sensor in response to the detection of a contaminant concentration above a predetermined threshold in the second air stream. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A system comprising:
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a breathing apparatus comprising; a housing assembly comprising a housing having a plurality of inlet ports with one air purifying element removably coupled to each inlet port by a connection mechanism, and a service life indicator arranged in parallel flow configuration with the breathing apparatus such that the service life indicator has a separate inlet and outlet from the inlet port and the outlet port of the breathing apparatus so air entering the service life indicator through the inlet separate and apart from the inlet port of the breathing apparatus is exhausted to ambient environment through the outlet separate and apart from the outlet port of the breathing apparatus and does not contact or mix with air passing through the breathing apparatus, wherein the service life indicator comprises; a sacrificial cartridge, and a sensor disposed downstream of the sacrificial cartridge and configured to detect a contaminant concentration above a predetermined threshold in a gas stream passing through the sacrificial cartridge; wherein the housing is sized to be portably carried by a user; and wherein the plurality of air purifying elements are removably coupled to the inlet ports so as to be located external to the housing. - View Dependent Claims (20)
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Specification