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2. Gas detector - Wikipedia

   en.wikipedia.org/wiki/Gas_detector

   Oxygen fraction in a breathing gas is measured by electro-galvanic oxygen sensors. They may be used stand-alone, for example to determine the proportion of oxygen in a nitrox mixture used in scuba diving, [20] or as part of feedback loop which maintains a constant partial pressure of oxygen in a rebreather. [21]

3. Electro-galvanic oxygen sensor - Wikipedia

   en.wikipedia.org/wiki/Electro-galvanic_oxygen_sensor

   Electro-galvanic fuel cell as used in a diving rebreather to measure the partial pressure of oxygen. Two oxygen cells as used by oxygen analysers for diving gas showing commonly used connectors. An electro-galvanic fuel cell is an electrochemical device which consumes a fuel to produce an electrical output by a chemical reaction.

4. Electrochemical gas sensor - Wikipedia

   en.wikipedia.org/wiki/Electrochemical_gas_sensor

   The sensors contain two or three electrodes, occasionally four, in contact with an electrolyte. The electrodes are typically fabricated by fixing a high surface area of precious metal onto the porous hydrophobic membrane. The working electrode contacts both the electrolyte and the ambient air to be monitored, usually via a porous membrane.

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7. Oxygen sensor - Wikipedia

   en.wikipedia.org/wiki/Oxygen_sensor

   The type of oxygen sensor used in most underwater diving applications is the electro-galvanic oxygen sensor, a type of fuel cell, which is sometimes called an oxygen analyser or ppO 2 meter. They are used to measure the oxygen concentration of breathing gas mixes such as nitrox and trimix . [ 9 ]