ISO 10723:2012 specifies a method of determining whether an analytical system for natural gas analysis is fit for purpose. It can be used either to determine a range of gas compositions to which the method can be applied, using a specified calibration gas, while satisfying previously defined criteria for the maximum errors and uncertainties on the composition or property or both, or to evaluate the range of errors and uncertainties on the composition or property (calculable from composition) or both when analysing gases within a defined range of composition, using a specified calibration gas.
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Sisällysluettelo
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Principle
6 General procedure
6.1 Analytical requirements
6.2 Response function types
6.3 Calibration gas reference data
6.4 Working measurement standards (WMS)
6.5 Experimental design
6.6 Calculation procedures
7 Interpretation
7.1 General considerations
7.2 Pre-defined performance specification
7.3 Determination of the analytical range of the instrument
7.4 Criteria for selection of hypothetical compositions
Annex A Example of application using chromatography (informative)
Annex B Explanation of approach used for instrument benchmarking (informative)
ISO 6143:2001 Gas analysis -- Comparison methods for determining and checking the composition of calibration gas mixtures
ISO 6974-2:2012 Natural gas -- Determination of composition and associated uncertainty by gas chromatography -- Part 2: Uncertainty calculations
ISO 6976:1995 Natural gas -- Calculation of calorific values, density, relative density and Wobbe index from composition
ISO 6143:2001 Gas analysis -- Comparison methods for determining and checking the composition of calibration gas mixtures
ISO 6974-2:2012 Natural gas -- Determination of composition and associated uncertainty by gas chromatography -- Part 2: Uncertainty calculations
ISO 6976:1995 Natural gas -- Calculation of calorific values, density, relative density and Wobbe index from composition
ISO/IEC Guide 98-3:2008 Uncertainty of measurement -- Part 3: Guide to the expression of uncertainty in measurement (GUM:1995)