本文件给出了用于测量工作场所大气中有毒气体和蒸汽的电气设备的选择、安装、使用和维护指南。此类设备的主要目的是通过提供有毒气体或蒸汽浓度指示和存在警告，确保人员和财产安全。购买本文件时可获得的所有当前修订均包含在购买本文件中。

This document gives guidance on the selection, installation, use and maintenance of electrical equipment used for the measurement of toxic gases and vapours in workplace atmospheres. The primary purpose of such equipment is to ensure safety of personnel and property by providing an indication of the concentration of a toxic gas or vapour and warning of its presence.All current amendments available at time of purchase are included with the purchase of this document.