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Electrochemical gas sensors
Electrochemical Hydrogen Sulfide (H2S) Sensor 4S-H2S
The 4S-H2S sensor is a constant-potential electrolytic H2S sensor. H2S and O2 undergo corresponding redox reactions at the working and counter electrodes, releasing charge to generate an electric current. The magnitude of this current is directly proportional to the H2S concentration; therefore, the H2S concentration can be determined by measuring the current.







