本文件定义了呼吸保护装置（RPD）的术语，并规定了测量单位，潜水设备除外。它表示RPD、RPD零件或说明手册上可能需要的图形符号，以便指导使用RPD的人员操作。 注:EN 250中给出了潜水设备的术语和定义。

This document defines terms and specifies units of measurement for respiratory protective devices (RPDs), excluding diving apparatus. It indicates graphical symbols that can be required on RPDs, parts of RPD or instruction manuals in order to instruct the person(s) using the RPD as to its operation. NOTE Terms and definitions for diving apparatus are given in EN 250.