The NATIONAL TIME Addressable Analog Photo-electric detector maintains consistent alarm detection over changing ambient conditions. In collaboration with the FACP, its intelligent self-adjusting drift compensation algorithm provides true alarm threshold levels above the detector’s ambient levels. The robust DigiComm^TM communication protocol provides reliable and accurate information to be exchanged between the detector and the Fire Alarm Control Panel. This two-wire loop circuit carries both data and 17-28VDC supply. Class A, B, or X wiring is supported and a built-in isolator simplifies system design. The detector’s address is set in its base providing a convenient and trouble-free maintenance procedure. The detectors mount to a selection of base styles to accommodate installation requirements. Bases include 4” and 6” versions with optional sounder. The detectors are UL268 7th edition approved.