DS EN 50131-2-2:2008
DS EN 50131-2-2:2008 Alarm Systems - Intrusion And Hold-Up Systems - Part 2-2: Intrusion Detectors - Passive Infrared Detectors Describes passive infrared detectors installed in buildings and provides for security grades 1 to 4, specific or non-specific wired or wire-free detectors, and uses environmental classes I to IV.