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When dangerous amounts of CO are detected, the CO1224T and CO1224TR (round) CO detectors alert occupants by sounding and flashing a temp-four signal alarm. With 24/7 central station monitoring, officials with System Sensor said occupants are guaranteed protection from the effects of CO. The CO1224T and CO1224TR CO detectors include RealTest® technology, so they can be tested using a CO gas agent, fully meeting the requirements of NFPA 720: 2009. Put the detector into RealTest mode, spray a small amount of CO into the detector per the installation instructions, and within seconds the detector will alarm, indicating successful gas entry. Designed for system operation, these detectors are fully listed to UL 2075 and offer a code-required trouble relay to send a sensor failure or end-of-life signal to the control panel and the central station.