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Gas Detection / Gas Principles / Electrochemical

Electrochemical

Microfuel cellPrinciple

Electrochemical sensor consists of 2, 3 or 4 electrodes, which are located in a gel electrolyte. A system of electrodes and the electrolyte is separated from the atmosphere by a diffusion barrier. Gas molecules diffuse through this barrier and react with the electrolyte. There are oxidation and reduction reactions at the electrodes and they cause a change of cell potential. The higher the gas concentration is, the higher the potential will be.

Benefits

  • Reliable and non-expensive sensors for „common“ gases

Weaknesses

  • Long response time (up to few minutes for some gases)
  • Higher price for special gases
  • Potential failure when exposed with high concentrations
  • Cross interferences (ozone sensor is sensitive to air flow, temperature and humidity changes)

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