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System Sensor 5602 Single-Circuit Mechanical Heat Detector HRL-LF System Sensor DNR Intelligent PhotoelectricSystem Sensor 5602 194F Fixed Temp Rate of Rise, Single Circuit Mechanical Heat Detector The 5600 series offers a full line of configurations to accommodate a broad range of applications. Both single and dual circuit models are available for low and high temperature ratings with either fixed temperature or combination fixed temperature rate of rise (ROR) activation. The ROR element of the fixed ROR models is restorable to accommodate field testing.