Fluid component detection method with feedback

Details Fluid component detection method with feedback Fluid component detection method with feedback

1990-06-11

1992-02-11

McMahon, Timothy M.

Chemistry: analytical and immunological testing

Sulfur containing

Organic or sulfhydryl containing

338 34, 422 681, 422 8202, 422 8204, 422 88, 422 90, 422 96, 422 97, 422 98, 436121, 436122, 436123, 436151, 436152, G01N 3300

Patent

active

050875744

ABSTRACT:
A selected component of a fluid mixture, for example a reduced sulfur compound vapor in air, is detected by selectively adsorbing the component onto a conductive thin layer of material having a chemical affinity for such component and observing the resultant change of electrical resistivity of the layer. The sensitivity of the detector changes with accumulation of the component on the sensor. The accumulation of the component on the sensor is removed by oxidizing and evolving the component from the sensor to restore the sensor to a linear operating region. The accumulated component is preferably oxidized by reacting the component with ozone. The dynamic range of the sensor is increased by counteracting the tendency for the component to accumulate by continuously feeding back ozone to or controlling the temperature of the sensor so that the sensor operates in a linear region near null.

REFERENCES:
patent: 3714562 (1973-01-01), McNerney
patent: 4274970 (1981-06-01), Beitzel
patent: 4326927 (1982-04-01), Stettler et al.
patent: 4351734 (1982-09-01), Kaufman
patent: 4412924 (1983-11-01), Feather

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