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    TEXT VERSION OF SLIDE:

    Title: Electrochemical Sensors

    Type: Text and Image Slide

    Content:
    • Theory - Gas diffusing into sensor reacts at sensing electrode to cause current to flow. A more precise term for this type is the "porous-electrode amperometric gas sensor". It is also called a fuel cell sensor. It will respond to gases that can be electrolytically reduced or oxidized on a metallic catalyst such as platinum or gold.
    • Gases Measured - O2, CO, NO2, NO, H2S, SO2, NH3, HCl, HCN, Cl2 and organic vapors such as alcohols, aldehydes, or ketones.
    • Advantages - Fairly inexpensive

    [Image of porous-electrode, three-electrode amperometric gas sensor]

    Notes:
    Schematic diagram of a typical, porous-electrode, three-electrode amperometric gas sensor.