2D51 Duct Smoke Detector for Special Applications The System Sensor 2D51 low-profile photoelectric smoke detector with a B210LP base tied to the D4P120 is listed to Underwriters Laboratories 268A specifically for use in no-flow/low-flow air-handling systems.
Features for 2D51/B210LP/D4P120 • Low-profile smoke detector design • Low standby current • Two LEDs blink in standby • Detector head plugs easily into base • Built-in test switch • F  ield sensitivity metering of detector to meet the requirements of NFPA 72 with the use of RTS2/RTS2-AOS and SENS-RDR • Designed for mounting on a standard electrical box • SEMS screws for easy wiring and positive wire retention • Removable cover...

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