UNE-EN 50131-2-4:2021

This document is for combined passive infrared and microwave detectors installed in buildings andprovides for security Grades 1 to 4 (see EN 50131-1), specific or non-specific wired or wire-freedetectors, and uses environmental classes I to IV (see EN 50130-5). This document does not includerequirements for detectors intended for use outdoors.The purpose of the detector is to detect the broad spectrum infrared radiation emitted by an intruder,to emit microwave signals and analyse the signals that are returned and to provide the necessaryrange of signals or messages to be used by the rest of the intrusion alarm system.For a combined detector where both technologies have to be activated in order to generate an alarmcondition, providing higher false alarm immunity, it is essential to meet the grade dependentrequirements of this document.For a combined detector which can be configured or operated such that each detection technologycan generate an alarm condition independently, it is essential to meet the grade-dependantrequirements of EN 50131-2-2 and EN 50131-2-3 when configured accordingly. Otherwise themanufacturer clearly states that the detector does not comply to this document and not to EN 50131-2-2 and EN 50131-2-3 when put into such a configuration.It is essential that a detector fulfil all the requirements of the specified grade.Functions additional to the mandatory functions specified in this document can be included in thedetector, providing they do not influence the correct operation of the mandatory functions.This document does not apply to system interconnections.