DS EN 50131-2-5:2008
DS EN 50131-2-5:2008 Alarm Systems - Intrusion And Hold-Up Systems - Part 2-5: Requirements For Combined Passive Infrared And Ultrasonic Detectors Defines combined passive infrared and ultrasonic detectors installed in buildings and provides for security Grades 1 to 4, specific or non-specific wired or wire-free detectors, and uses environmental