DIN EN 45544-4-2000 工作场所空气.有毒气体和蒸气的直接浓度测量和直接检测用的电气装置.第4部分:选择、安装、使用和维修指南
Workplace atmospheres - Electrical apparatus used for the direct detection and direct concentration measurement of toxic gases and vapours - Part 4: Guide for selection, installation, use and maintenance; German version EN 45544-4:1999