BS EN 12261:2002

1 Scope
2 Normative references
3 Terms, definitions and symbols
  3.1 Terms and definitions
  3.2 Symbols
4 Meter classification
  4.1 Flange pressure ratings
  4.2 Gas meter sizes, rangeability and connection diameter
      sizes
  4.3 Connections and dimensions
  4.4 Temperature ranges
  4.5 Climatic environment
5 Metrological performance requirements
  5.1 General
  5.2 Type testing
6 Design and material requirements
  6.1 General
  6.2 Robustness
  6.3 Resistance to environmental conditions
  6.4 Removable meter mechanisms
  6.5 Indicating devices and accessories
  6.6 Pressure and temperature tappings
  6.7 Lubrication
7 Meter output
  7.1 General
  7.2 Indicating device
  7.3 Pulse generator
  7.4 Output shaft
  7.5 Test element
8 Marking
  8.1 General
  8.2 Data Plate
  8.3 Direction of flow
  8.4 Working position
  8.5 Other connections
9 Documentation
  9.1 General
  9.2 Declaration of conformity
  9.3 Instruction manual
Annex A (normative) Test facility specifications
Annex B (normative) Perturbation testing
Annex C (informative) Recommendations for use
Annex D (normative) Individual factory testing
Annex E (normative) Metrological requirements and tests for
         each meter prior to dispatch (Individual meter testing)
Annex ZA (informative) Relationship between this European
         Standard and the Essential Requirements of EU
         Directive 2004/22 Measuring Instruments Directive
Bibliography

Describes the measuring conditions, requirements and tests for the construction, performance and safety of class 1,0 axial and radial turbine gas meters with mechanical indicating devices, herein after referred to as a meter(s), having in-line pipe connections for gas flow measurement.

To harmonize the standard under the MID, 2004/22/EC. The Target dates have been shortened in order to meet the enforcement date of the MID.