IEC 61831:2011(E)是适用于在线分析仪系统的指南。它为系统供应商和用户提供了必要的指导，以指定或设计从过程中的采样点到用于显示或控制目的的最终输出的完整分析仪系统。这第二版取消并取代了1999年出版的第一版。本版构成技术修订版。与上一版相比的主要变化是: -更新的参考文献； -与现行惯例和条例保持一致； -在适用的情况下纳入新技术。

IEC 61831:2011(E) is a guide applicable to on-line analyser systems. It provides the necessary guidance for the system supplier and user to specify or design a complete analyser system from sample point in the process to the final output for display or control purposes. This second edition cancels and replaces the first edition published in 1999. This edition constitutes a technical revision. The main changes with respect to the previous edition are:
- Updated references;
- Made consistent with current practices and regulations;
- Incorporating new technologies where applicable.