This European Standard11 establishes requirements, test methods and performance criteria for (point) heat detectors containing a static element in which the heat-sensitive elements (except those with auxiliary functions such as characteristic correctors) they are at least 15 mm away from the surface on which the detectors are mounted.
UNI EN 54-P5-1979 history
1979UNI EN 54-P5-1979 Components of automatic fire detection system. Thermal detector. Point detector with static components