System Sensor 2D51 Low-Profile Plug-In Photoelectric Smoke Detector Head for 4-Wire Systems

Designed for pendant or plenum mounting in no-flow and low-flow air-handling systems operating from 0 to 4,000 FPM, the 2D51 smoke detector installs in a B210LP base and connects to a D4P120 power board control unit. One D4P120 board can support up to two 2D51 sensors.

The twist-in/twist-out detector head is easy to remove for cleaning and maintenance. A built-in test switch and two standby LEDs support straightforward status checks. Test the head locally with a magnet or the D4P120 board’s Test/Reset button; remote testing is also supported with compatible RTS accessories connected to the board.

Features include a low-profile design, low standby current, removable cover and insect screen for field cleaning, and SEMS screws for wiring and wire retention. Designed for installation on a standard electrical box. The D4P120 can also connect to compatible remote annunciators for audible and visual detector-status indication.