NEN EN 50271 : 2010

1 Scope
2 Normative references
3 Definitions
4 Design principles
   4.1 General design requirements
       4.1.1 Analogue/digital interface
       4.1.2 Numerical errors
       4.1.3 Measuring operation
       4.1.4 Special state indication
       4.1.5 Digital indication
       4.1.6 Digital reading (not applicable to
             alarm only apparatus)
   4.2 Software
   4.3 Hardware
   4.4 Data transmission
5 Test of the digital unit
   5.1 Verification of functional concept
   5.2 Performance test

Defines minimum requirements and tests for electrical apparatus for the detection and measurement of combustible gases, toxic gases or oxygen using software and/or digital technologies.