SYSTEM SENSOR 2D51 Smoke Detector, 4-wire, Photoelectronic

The SYSTEM SENSOR 2D51 is a 4-wire photoelectronic smoke detector with a low-profile design and low standby current. It includes two LEDs that blink when in standby mode, aiding visual status checks.

The detector head easily plugs into its base and features a built-in test switch. It supports field sensitivity adjustment to comply with NFPA 72 standards using RTS2/RTS2-AOS and SERDR tools. SEMS screws simplify wiring and ensure secure connections.

Additional features include a removable cover with an insect screen for cleaning, remote push button test/reset functionality, onboard supervisory alarm relays, and compatibility with both 24V and 120V power supplies. The unit can interconnect with up to 100 devices and works smoothly with System Sensor InnoviarFlex D4120 and D4120W duct smoke detectors and accessories.