SIS SS-EN 50 058-1992 电气设备可燃气体的检测和测量．第二组仪器显示高达100 ％ （ V / V ）的气体的性能要求
Electrical apparatus for the detection and measurement of combustible gases - Performance requirements for Group II apparatus indicating up to 100 % (v/v) gas
1.1 This European Standard specifies performance requirements for Group II (as defined in European Standard EN 50 054) portable, transportable and fixed apparatus for the detection and measurement of combustible gas or vapour concentrations with air. The apparatus, or parts thereof, may be installed or used in potentially explosive atmospheres, other than mines susceptible to firedamp (i.e. Group I). The general requirements and test methods applicable to the apparatus covered by this European Standard are specified in European Standard
EN 50 054.
1.2 This European Standard is restricted to apparatus intended for the detection and measurement of volume ratios of combustible gas or vapour in air from 0 % (v/v) to 100 % (v/v).
NOTE 1. Apparatus covered by this European Standard will normally be intended to operate in volume ratios greater than 100 % LEL.
NOTE 2. Although apparatus of the types covered by this European Standard may be suitable for detecting a wide range of combustible gases, particular gases (e.g. methane or propane) are specified in European Standard EN 50 054 as the components of the test gases for the purpose of practical covenience. The performance requirements specified in this European Standard must therefore be regarded with caution when the apparatus is used to detect other combustible gases, as some parameters - such as time of response - will be modified.