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EVS 758:2009. Metrology: terms and definitions.

EVS-EN 12261. Gas metes – Turbine gas meters.

EVS-EN 12405-1. Gas meters – Conversion devices – Part 1: Volume conversion.

EVS-EN 12405-2. Gas meters – Conversion devices – Part 2: Energy conversion

EVS-EN 12480. Gas meters – Rotary displacement gas meters.

EVS-EN 1776. Gas infrastructure – Gas measuring systems – Functional requirements.

EVS-EN 437. Test gases. Test pressures. Appliance categories.

EVS-EN ISO 10101. Natural gas - Determination of water by the Karl Fischer method.

EVS-EN ISO 10723. Natural gas - Performance evaluation for on-line analytical system.

EVS-EN ISO 11541. Natural gas - Determination of water content at high pressure.

EVS-EN ISO 13443. Natural gas - Standard reference conditions.

EVS-EN ISO 18453. Natural gas - Correlation between water content and water dew point.

EVS-EN ISO 19739. Natural gas - Determination of sulfur compounds using gas chromatography.

EVS-EN ISO 6141. Gas analysis - Requirements for certificates for calibration gases.

EVS-EN ISO 6142. Gas analysis - Preparation of calibration gas mixtures -Gravimetric method.

EVS-EN ISO 6143. Gas analysis - Comparison methods for determining and checking the composition of calibration gas mixtures.

EVS-EN ISO 6326. Natural gas - Determination of sulfur compounds.

EVS-EN ISO 6327. Gas analysis - Determination of the water dew point of natural gas - Cooled surface condensation hygrometers.

EVS-EN ISO 6570. Natural gas - Determination of potential hydrocarbon liquid content - Gravimetric methods.

EVS-EN ISO 6974-1. Natural gas - Determination of composition and associated uncertainty by gas chromatography - Part 1: General guidelines and calculation of composition.

EVS-EN ISO 6974-2. Natural gas - Determination of composition and associated uncertainty by gas chromatography - Part 2: Uncertainty calculations.

EVS-EN ISO 6974-3. Natural gas - Determination of composition with defined uncertainty by gas chromatography - Part 3: Determination of hydrogen, helium, oxygen, nitrogen, carbon dioxide and hydrocarbons up to C8 using two packed columns.

EVS-EN ISO 6974-4. Natural gas - Determination of composition with defined uncertainty by gas chromatography - Part 4: Determination of nitrogen, carbon dioxyde and C1 to C5 and C6+ hydrocarbons for a laboratory and on-line measuring system using two columns.

EVS-EN ISO 6974-5. Natural gas - Determination of composition with defined uncertainty by gas chromatography - Part 5: Determination of nitrogen, carbon dioxide and C1 to C5 and C6+ hydrocarbons for a laboratory and on-line process application using three columns.

EVS-EN ISO 6974-6. Natural gas - Determination of composition with defined uncertainty by gas chromatography - Part 6: Determination of hydrogen, helium, oxygen, nitrogen, carbon dioxide and C1 to C8 hydrocarbons using three capillary columns.

EVS-EN ISO 6975. Natural gas - Extended analysis - Gas-chromatographic method.

EVS-EN ISO 6976. Natural gas - Calculation of calorific values, density, relative density and Wobbe index from composition.

EVS-EN ISO/IEC 17025. General requirements for the competence of testing and calibration laboratories.

ISO 17089-1. Measurement of fluid flow in closed conduits. Ultrasonic meters for gas. Meters for custody transfer and allocation measurement.

ISO 23874. Natural gas -Gas chromatographic requirements for hydrocarbon dewpoint calculation.

ISO/IEC GUIDE 99:2007. International vocabulary of metrology. Basic and general concepts and associated terms VIM).

ISO/TR 11150. Natural gas - Hydrocarbon dew point and hydrocarbon content

ISO/TR 22302:2014. Natural gas - Calculation of methane number.

OIML R 137-1 and 2. Gas meters.

OIML R140. Measuring systems for gaseous fuel.

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