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The main function of the gas sensor is to detectcarbon monoxide (CO) generated as a result of a fire,but it will also detect hydrogen (H) and nitrousmonoxide (NO). The sensor signal value is proportionalto the concentration of gas. The gas sensor deliversadditional information to effectively suppressdeceptive values.Since the service life of the gas sensor is limited, the Csensor of the FAP‑DOTC420 detector shuts downautomatically after 6 years of operation, and the Csensor of the FAP‑OTC 420 detector after 5 years ofoperation. The FAP‑DOTC420 detector will then stilloperate as a DOT detector and the FAP‑OTC 420detector as an OT detector. The detectors should beexchanged immediately in order to keep the higherdetection reliability of the DOTC/OTC versions
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