BS EN 50131-13:2020 pdf free.Alarm systems一Intrusion and hold-up systems—Pyrotechnic Obscuration Security Devices. BS EN 50131-13 1 Scope This document specifies the requirements for pyrotechnic obscuration security devices as a part of an IAS. It covers application and performance and specifies the necessary tests and trials to ensure efficiency and reliability of such obscuration devices. This document is not intended to...