Apparatus for monitoring the solvent content of air

Details Apparatus for monitoring the solvent content of air Apparatus for monitoring the solvent content of air

1977-04-07

1978-09-05

Goldstein, Herbert

Measuring and testing

Gas analysis

Gas chromatography

68 13R, 68 18R, G01N 2704

Patent

active

041110340

ABSTRACT:
An apparatus for monitoring the solvent content of air, especially for detecting the presence of perchloroethylene or trichloroethylene in association with a drycleaning plant, for measuring the concentration of the solvent and/or for triggering an alarm in the event a solvent concentration exceeds a predetermined limit. The sensor comprises a metal oxide semiconductor electrically heated to a predetermined temperature and having a surface exposed to the solvent molecules in the air so that its electrical resistance or conductivity changes as a function of the solvent concentration.

REFERENCES:
patent: 3388567 (1968-06-01), Oles
patent: 3586486 (1971-06-01), Kim et al.
patent: 3877291 (1975-04-01), Hoppesch et al.
patent: 3879717 (1975-04-01), Gruensfelder
patent: 3901067 (1975-08-01), Boardman et al.
patent: 3953173 (1976-04-01), Obayashi et al.
patent: 3955268 (1976-05-01), Chou et al.
patent: 4028057 (1977-06-01), Nelson

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