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FC-H2-XXXX H2 sensor with long service life works on the proven fuel cell technology. Once H2 arrives at the working electrode(anode) it is oxidized instantaneously to generate an electrical signal which is proportional to the H2 concentration. By calibrating the sensor with a known concentration of H2, the output current of the sensor can be used to quantitatively determine H2 concentration. FC-H2-XXXX is famous for its long service life, high anti-interference ability and the sensor has a compact size which is the ideal choice for size oriented applications such as portable H2 detectors, small residential H2 detectors, and multi-sensor fire detectors. The calibration information is stored in barcode printed on the sensor, enabling users to skip the costly gas calibration process and allowing for individual sensor tracking. Since there is no consumption components in the sensor, FC-H2-XXXX possesses excellent long service life and ensures maintenance-free operation.