Alarm systems. Intrusion and hold-up systems - Requirements for combined passive infrared and ultrasonic detectors Ingestion-build-51215 BS 3907-4 covers apparatus and

BS 3907-4 covers apparatus and solvent required for testing as well as test sampling and procedure to determine manganese

utensils and glassware

The object of BS IEC 62523 is to define the tests and the relevant testing methods for determining the performance characteristics of the radiographic inspection systems

Hemispherical transmittance factor with specular included

9 Centring device

Alarm systems. Intrusion and hold-up systems - Requirements for combined passive infrared and ultrasonic detectors Ingestion-build-51215 BS 3907-4 covers apparatus and1 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