Combined sensor device for detecting toxic gases

Details Combined sensor device for detecting toxic gases Combined sensor device for detecting toxic gases

G - Physics

01

N

150/20, 324/25.5

G01N 27/26 (2006.01) G01N 33/00 (2006.01)

Patent

CA 1261720

COMBINED SENSOR DEVICE FOR DETECTING TOXIC GASES ABSTRACT An instrument capable of detecting low concentrations of a pollutant or other component in air or other gas, including a combination of a heating filament having a catalytic surface of a noble metal for exposure to the gas and producing a derivative product from the component, and an electrochemical sensor responsive to the derivative product or providing a signal indicative of the product. At concentrations in the order of about 1-100 ppm of tetra- chloroethylene, neither the heating filament nor the electrochemical sensor is individually capable of sensing the pollutant. In the combination, the heating filament converts the benzyl chloride to one or more derivative products which may be detected by the electrochemical sensor.

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