工作场所大气 第2部分：气体探测器 有毒气体和蒸汽探测器的选择、安装、使用和维护

[中文适用范围]： 本文件为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、使用和维护提供了指导。此类设备的主要目的是通过提供以下功能来确保人员和财产的安全： [外文原描述]： IEC 62990-2:2021 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. This document is applicable to equipment whose purpose is to provide an indication, alarm or other output function to give a warning of the presence of a toxic gas or vapour in the atmosphere and in some cases to initiate automatic or manual protective actions. It is applicable to equipment in which the sensor automatically generates an electrical signal when gas is present. For the purposes of this document, equipment includes: a) fixed equipment; b) transportable equipment, and c) portable equipment. This document is intended to cover equipment defined within IEC 62990-1, but can provide useful information for equipment not covered by that document.