Residual life indicating system
First Claim
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1. A residual life indicating system for a filter, comprising:
- a main filter;
a first sampling filter, wherein said main filter and said first sampling filter both receive an ambient gas meant to be filtered;
a sensor positioned downstream from said first sampling filter wherein said sensor senses the presence of a predetermined chemical in the gas which has been filtered by said first sampling filter; and
a second sampling filter, spaced from said first sampling filter, wherein said second sampling filter is in series with said first sampling filter.
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Abstract
A residual life indicating system for a filter includes a main filter, a sampling filter, and a sensor. Both the main filter and the sampling filter receive an ambient gas meant to be filtered. The sensor connects to the sampling filter and senses the presence of a predetermined chemical in the gas that has been filtered by the sampling filter.
35 Citations
27 Claims
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1. A residual life indicating system for a filter, comprising:
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a main filter; a first sampling filter, wherein said main filter and said first sampling filter both receive an ambient gas meant to be filtered; a sensor positioned downstream from said first sampling filter wherein said sensor senses the presence of a predetermined chemical in the gas which has been filtered by said first sampling filter; and a second sampling filter, spaced from said first sampling filter, wherein said second sampling filter is in series with said first sampling filter. - View Dependent Claims (2, 3, 4, 5)
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6. A residual life indicating system for a filter in a gas purification assembly, comprising:
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a main filter; a sampling filter spaced from said main filter, wherein said main filter and said sampling filter each receive an ambient gas meant to be filtered; an accumulator located downstream from said sampling filter and in fluid communication therewith; a heater mounted to said accumulator for heating same; and a sensor connected to said accumulator, said sensor sensing the presence of a predetermined chemical in the gas which has been filtered by said sampling filter and has entered said accumulator. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14)
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15. An air purification assembly comprising:
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a housing defining an air flow path; an air pressurizing member located in said housing along said air flow path for supplying pressurized ambient air; a main filter located in said air flow path for filtering the pressurized ambient air flowing along said air flow path; a first sampling filter in fluid communication with said air flow path via an orifice for sampling the pressurized ambient air; a second sampling filter, spaced from said first sampling filter, wherein said second sampling filter is in series with said first sampling filter; a sensor communicating with said first sampling filter for sensing the presence of a predetermined chemical in the air exiting said first sampling filter. - View Dependent Claims (16, 17, 18, 19)
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20. A residual life indicating system for a filter, comprising:
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a main filter; a sampling filter, wherein said main filter and said sampling filter both receive an ambient gas meant to be filtered; a supply of a pressurized challenge gas; a conduit for connecting said challenge gas supply to said sampling filter; a regulator for regulating a flow of the challenge gas to said sampling filter, wherein said regulator comprises a metering solenoid; and
,a sensor located downstream from said sampling filter wherein said sensor senses the presence of a predetermined chemical in the gas which has been filtered by said sampling filter. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27)
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Specification