Radiant energy – Ionic separation or analysis – With sample supply means
Patent
1980-05-19
1982-03-02
Dixon, Harold A.
Radiant energy
Ionic separation or analysis
With sample supply means
250286, 250309, B01D 5944, H01J 4900
Patent
active
043179959
ABSTRACT:
A detector for trace quantities of chemical species in the atmosphere includes a pump for drawing an atmospheric sample through transfer means which transfer species molecules present in the sample to a dry carrier gas circulating in a closed gas flow circuit including the transfer means, an ionmobility type detector, filters and a circulating pump; the filters remove water molecules and species molecules from the carrier gas. The carrier gas may be air. The arrangement inhibits water vapor reaching the detector and reducing its sensitivity to the chemical species.
REFERENCES:
patent: 3629574 (1971-12-01), Carroll
patent: 3668382 (1972-06-01), Cohen et al.
patent: 4239967 (1980-12-01), Carr et al.
Bradshaw Robert F. D.
Brokenshire John L.
Dixon Harold A.
Miller Paul R.
U.S. Philips Corp.
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