Alarm systems. Intrusion and hold-up systems - Requirements for combined passive infrared and ultrasonic detectors Ingestion-build-51215 Hemispherical transmittance factor with specular

Hemispherical transmittance factor with specular included

utensils and glassware

NOTE 1 Civilian groups working alongside police or prison services in specialist operational situations might find by risk assessment that this British Standard offers additional protection for such activities and threats not within the scope of other standards

The combination of 19 in based cabinets or racks and subracks and chassis is broadly applied to all industrial electronic fields in the world

Alarm systems. Intrusion and hold-up systems - Requirements for combined passive infrared and ultrasonic detectors Ingestion-build-51215 Hemispherical transmittance factor with specular1 Scope This European Standard is for combined passive infrared and ultrasonic detectors installed in buildings and provides for security grades 1 to 4 (see EN 501311), specific or non specific wired or wire free detectors, and uses environmental classes I to IV (see EN 501305). This standard does not include requirements for combined passive infra red and ultrasonic detectors intended for use outdoors. A detector shall fulfil all the requirements of