爆炸性环境第42部分:防爆设备潜在火源控制用电气安全装置

[中文适用范围]： 本部分 IEC 60079 作为技术规范，为设备制造商在爆炸性环境中使用电气安全装置以减少潜在点火源成为有效点火源的几率提供指导。电气安全装置执行安全功能，控制来自电气或非电气防爆设备的潜在点火源。本文件也可应用于执行安全功能的组合元件。例如：传感器、逻辑系统、最终元件。本技术规范也可用于独立评估安全装置，而不必为特定防爆设备设计。安全装置可以是实现防爆设备所需 EPL 的措施。然而，通过简单添加安全装置来提高防爆设备的 EPL 不在本文件范围内。本文件不适用于机械控制设备（如泄压阀、机械调速器和其他机械安全装置）、气体检测的使用、防止爆炸性环境发生的控制设备（如惰化系统和通风系统）以及爆炸的缓解。 [外文原描述]： IEC TS 60079-42:2019 provides guidance for equipment manufacturers where electrical safety devices are used to reduce the likelihood of potential ignition sources becoming effective in Ex Equipment located in Explosive Atmospheres. Electrical safety devices perform a safety function to control potential ignition sources from both, electrical or non-electrical Ex Equipment in explosive atmospheres. This Technical Specification may also be applied to a combination of elements performing a safety function. For example: Sensor, Logic system, Final element. This Technical Specification can also be used for assessing the safety device independently, without being designed for a specific Ex Equipment. A safety device can be a measure to achieve a required EPL of the Ex Equipment with respect to a potential ignition source. The combination of the safety device and the Ex Equipment could then comply with the relevant standards of the IEC 60079 series and the ISO 80079 series with respect to the Equipment Protection Level. However, increasing the EPL of Ex Equipment by the simple addition of a safety device is not within the scope of this Technical Specification. This Technical Specification does not apply to: • mechanical control equipment such as pressure relief valves, mechanical governors and other mechanical safety devices • the use of gas detection • control equipment to prevent the occurrence of explosive atmospheres, e.g. inerting systems and ventilation systems • mitigation of an explosion