ISO 7240-22:2017规定了用于建筑物内安装的火灾探测和报警系统的管道烟雾探测设备（SDED）的要求、试验方法和性能标准（见ISO 7240-1）。 SDED对管道中的空气进行采样，并检测样本中的烟雾。 注1:一种常见的操作方法是使用管道中气流产生的压差。 SDED可使用符合ISO 7240-7的烟雾探测器或符合ISO 7240-22:2017规定的测试的其他探测器。 SDED的一个常见应用是检测可见烟雾，使用散射光或透射光的探测器更适合这种情况。然而，ISO 7240-22:2017中也包含了使用电离的探测器的要求，用于需要检测不太可见的火灾气溶胶的应用。 对于其他类型的烟雾探测器或工作原理不同的烟雾探测器的测试，ISO 7240- 22:2017可用于指导。不包括针对特定风险开发的具有特殊特性的烟雾探测器。 注2:某些类型的探测器含有放射性物质。国家对辐射防护的要求因国家而异，ISO 7240-22:2017中没有规定。

ISO 7240-22:2017 specifies requirements, test methods and performance criteria for smoke-detection equipment for ducts (SDED) for use in fire detection and alarm systems installed in buildings (see ISO 7240？1). The SDED samples the air from a duct and detects smoke in the sample. NOTE 1 A common method of operation is to use differential pressure arising from airflow in the duct. The SDED can use smoke detectors complying with ISO 7240？7 or other detectors complying with tests specified in ISO 7240-22:2017. A common application for SDED is to detect visible smoke, for which detectors using scattered light or transmitted light can be more suitable. However, requirements for detectors using ionization are also included in ISO 7240-22:2017 for use in applications where detection of less visible fire aerosols is desired. For the testing of other types of smoke detectors or smoke detectors working on different principles, ISO 7240-22:2017 can be used for guidance. Smoke detectors with special characteristics, developed for specific risks, are not covered. NOTE 2 Certain types of detectors contain radioactive materials. The national requirements for radiation protection differ from country to country and are not specified in ISO 7240-22:2017.