scope:

Provide some background information and gives guidance on the selection, installation, use and maintenance of electrical apparatus used for the direct detection and concentration measurement of toxic gases and vapours in workplace air. It is aimed at apparatus whose primary purpose is to indicate the presence and concentration of a toxic gas or vapour with a view to providing a rapid indication or warning of the presence of a toxic hazard. It applies to: - personal, portable, transportable and fixed apparatus; - apparatus where the presence of a gas or vapour causus an automatically generated electrical signal; - apparatus intended to provide an indication, alarm and/or other output function, whose purpose is to give a warning of potential toxic hazard and in some cases to initiate automatic or manual protective actions.