This European Standard is for microwave detectors installed in buildings and provides for securitygrades 1 to 4 (see EN 50131-1), specific or non-specific wired or wire-free detectors, and usesenvironmental classes I to IV (see EN 50130-5). This standard does not include requirements formicrowave detectors intended for use outdoors.A detector shall fulfil all the requirements of the specified grade.Functions additional to the mandatory functions specified in this standard may be included in thedetector, providing they do not influence the correct operation of the mandatory functions.The standard does not apply to system interconnections.