High Quality Content by WIKIPEDIA articles! A hydrogen sulfide sensor or H2S sensor is a gas sensor for the measurement of hydrogen sulfide. The H2S sensor is a metal oxide semiconductor (MOS) sensor which operates by a reversible change in resistance caused by adsorption and desorption of hydrogen sulfide in a film with hydrogen sulfide sensitive material like tin oxide thick films and gold thin films. Current response time is 25 ppb to 10 ppm < one minute.

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