Electrochemical

The electrochemical measuring principle is often used for measurement of O₂ in extractive gas analysis systems. However, it can also be used for measurement of CO, NO and SO₂ from small transportable gas analyser systems. The measurement is made by letting for instance O₂ pass through a gas selective membrane, which only allows for the gas to be measured to pass through. The O₂-molecules diffuse into an electrolyte solution and are converted to H₂O. This reaction is provoked by a gold cathode in the electrolyte. By the anode, which is made of lead, lead oxide is produced by means of the electrons that are released when O₂ reacts and is converted to H₂O. The migration of electrons between the anode and the cathode represents the amount of O₂ converted to H₂O, and it is thus an indicator of the O₂-concentration in the process.

During the latest years, the use of the electrochemical measurement principle has become more common. This is partly due to the fact that the electrochemical cells have been developed continuously so that they have now become both accurate, stable and with long service lives. Besides, the measurement of O₂ by the the electrochemical measuring principle is less expensive than measurement of O₂ using the paramagnetic measuring principle.

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