The IRD-23 is a ceiling mount PIR motion sensor with a 360° look-down capability to eliminate blind spots in the monitored area. When mounted on a ceiling at 8.8’ to 13’ (2.7 m to 4 m) high, the IRD-23 has a 360° look-down view that covers an area of 20’ to 26’ (6 m to 8 m) in diameter. The IRD-23 is an ideal solution for the protection of entrances, corridors, hallways and passages, where a moving person cannot evade passing through the detector’s coverage pattern.