NEN EN 250 : 2014

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Description
    4.1 General
    4.2 Sub-assemblies
5 Requirements
    5.1 Design
    5.2 Materials
    5.3 Air cylinder(s)
    5.4 Cylinder valves
    5.5 High pressure parts and connections
    5.6 Demand regulator
    5.7 Hose assemblies
    5.8 Safety device
    5.9 Facepiece
    5.10 Body harness
    5.11 Resistance to temperature
    5.12 Cleaning and disinfection
    5.13 Practical performance test
6 Testing
    6.1 General
    6.2 Visual inspection
    6.3 High and medium pressure parts and connections
    6.4 Pressure relief system
    6.5 Demand regulator
    6.6 Exhalation valve
    6.7 Cylinder valve
    6.8 Facepiece
    6.9 Safety devices
    6.10 Resistance to specific temperatures
    6.11 Practical performance test
7 Marking
8 Information supplied by the manufacturer
Annex ZA (informative) Clauses of this European Standard
         addressing essential requirements or other
         provisions of EU Directives

Defines minimum requirements for self-contained open-circuit compressed air underwater breathing apparatus and their sub-assemblies to ensure a minimum level of safe operation of the apparatus down to a maximum depth of 50 m.