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The 700 series detectors feature an interchangeable head and base with a light-scattering optical sensor that provides stability and excellent response to a wide range of fires. A pulsed infrared LED light source and a high-speed photodiode sensing element are housed in an omni-directional sensing chamber, which is protected by an insect screen. For easy cleaning, the detector features a field replaceable optical chamber. Built-in drift compensation automatically adjusts the sensitivity as the detector gets dirty.