Radiant energy – Ionic separation or analysis – With sample supply means
Patent
1995-07-31
1996-09-10
Berman, Jack I.
Radiant energy
Ionic separation or analysis
With sample supply means
250289, 250287, 7386481, 73 3102, H01J 4904
Patent
active
055548466
ABSTRACT:
In an apparatus for detecting alarm molecules, residual alarm molecules are automatically removed during a clear-down mode before a subsequent air sample is to be introduced. The apparatus comprises a detector unit, a sensor unit and a filtering sub-unit including a pump and a filter. During a challenge, the pump in the sub-unit is turned off, and the air sample passes from the inlet port of the first unit through the second unit to the output port of the first unit, thereby depositing alarm molecules in the first unit and the second unit. During the clear-down mode, the pump in the sub-unit is turned on, and outside air enters through the output port of the first unit, mixes with air flow from the output of the second unit, and passes through the sub-unit. Filtered air from the sub-unit exhausts the first unit through the inlet port of the first unit and passes into the second unit, thereby cleaning the first unit and the second unit from the alarm molecules deposited therein during the challenge mode.
REFERENCES:
patent: 4317995 (1982-03-01), Bradshaw et al.
patent: 4578586 (1986-03-01), Preston
patent: 4943929 (1990-07-01), Simonoff
patent: 5475217 (1995-12-01), Bradshaw
Kubicsko Stephen D.
Regiec Kenneth B.
Stroosnyder Peter C.
Ward, II Charles H.
Berman Jack I.
Bloom Leonard
Environmental Technologies Group, Inc.
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