Standard
Track updates
AS/NZS 4944:2006
[Current]Gas meters — In-service compliance testing
Provides requirements for an in-service compliance testing regime for gas meters. It is intended for use by utilities or meter providers responsible for maintaining metrological performance (in-service compliance) of meters.
Published: 03/01/2006
Pages: 21
Table of contents
Cited references
Content history
Table of contents
Header
About this publication
Preface
Foreword
1 Scope
2 Application
3 Referenced documents
4 Definitions
4.1 Definitions relating to meters
4.2 Definitions relating to the process
5 Comparison of attributes inspection with variables inspection
6 In-service compliance testing
6.1 General
6.2 Implementation
6.2.1 Installed and verified meters
6.2.2 New and refurbished meter types
7 Metrological performance
7.1 Meter error
7.1.1 Sampling by attributes
7.1.2 Sampling by variables
7.2 Other performance characteristics
7.2.1 General
7.2.2 External leakage test
7.2.3 Registration of Qmin
8 Procedure for testing meters
8.1 Documentation
8.2 Grouping of meters (Step 1)
8.3 Sample size and pass/fail criteria (Step 2)
8.4 Selection of samples (Step 3)
8.5 Testing of samples (Step 4)
8.6 Calculation of results (Step 5)
8.6.1 Attributes
8.6.2 Variables
8.6.2.1 Normality
8.6.2.2 Outliers
8.6.2.3 Calculations
8.7 Decision on the population (Step 6)
8.7.1 General
8.7.2 Failure categories
8.7.3 Accuracy by attributes
8.7.4 Accuracy by variables
8.7.5 Other performance characteristics
8.7.6 Returning sample meters to the field
8.8 Reporting of data (Step 7)
Appendix A
Appendix B
B1 Accuracy by variables testing
B1.1 Statistical analysis
B1.2 Decision on individual load points
B1.3 Decision on population
B2 Accuracy by attributes testing
B2.1 Results of sample for attributes testing
B2.2 Decision on individual test points
B2.3 Decision on population
Cited references in this standard
[Current]
Sampling procedures for inspection by attributes — Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection — Technical Corrigendum 1
[Current]
Statistical interpretation of data — Techniques of estimation and tests relating to means and variances
[Withdrawn]
Sampling procedures and charts for inspection by variables for percent nonconforming
[Current]
Sampling procedures for inspection by attributes, Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection
Content history
AS/NZS 4944-2006 REC:2017
DR 03328
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