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Electrochemical Sensors
  • 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
Schematic diagram of a typical, porous-electrode, three-electrode amperometric gas sensor.

 
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