Addressable Multi-Criteria Smoke/Heat Detector 41RML000Detector 41RFU000 is a multi-criteria detector combining the detection modes of the class A1R rate-of-rise detector and an optical Tyndall effect smoke detector. The sensor is also fitted with a built-in isolator. Microprocessor-controlled digital signal analysis. Dirt level auto-compensation and maintenance indication. Programmable sensitivity across three levels. Operating class A1R. Low-profile design. High-visibility light indications. Addressing method with auto-acquisition or with programmer. Built-in isolator. Approved to EN 54-5, EN 54-7 and EN 54-17.