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Standards Development
This specifies a method for determining whether an analytical system for biomethane composition analysis is fit for a defined purpose. It can be used:
a) to determine a range for each specified component over which the errors and uncertainties in measured composition do not exceed a predefined measurement requirement, using specified calibration gas(es);
b) to determine errors and uncertainties in a measured composition over a pre-defined range for each analyte, using specified calibration gas(es). It is assumed that the analytical system is applied to compositions that vary over the typical ranges found within biomethane.
Examples specific to gas chromatography, spectroscopy and spectrometry are provided throughout the document.
The growing deployment of biomethane in gas networks requires reliable methods for verifying that analytical systems used for composition measurement are fit for purpose. Existing standards (e.g. ISO 10723 for natural gas) do not fully address the specific measurement challenges posed by biomethane, including the wide variability in composition and the presence of trace components not found in conventional natural gas. This document specifies a protocol for evaluating the performance of analytical systems, including gas chromatographs, spectrometers, and spectrometry-based systems used for biomethane composition analysis. The protocol provides a systematic basis for determining whether a given system meets defined measurement requirements, using specified calibration gases. It supports both laboratory-based evaluation and in-field assessment. Standardising this evaluation protocol will facilitate fair comparison between different analyser types, enable reliable accreditation of measurement services, support regulatory compliance, and reduce trade barriers associated with biomethane quality certification across different markets. It will benefit instrument manufacturers, gas network operators, certification bodies, laboratories, and regulators.
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