DIN EN ISO 6145-6:2017-12
Gas analysis - Preparation of calibration gas mixtures using dynamic methods - Part 6: Critical flow orifices (ISO 6145-6:2017); German version EN ISO 6145-6:2017
| Fecha edición: |
2017-12-01
En Vigor
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| Idiomas disponibles: | Inglés, Alemán |
| Resumen: | This part of ISO 6145 specifies a method for the dynamic preparation of calibration gas mixtures containing at least one component gas and one complementary gas from pure gases or gas pre-mixtures using critical flow orifices systems. The method applies principally to the preparation of mixtures of non-reactive gases that do not react with any of the materials forming the gas circuit inside the critical flow orifices system or auxiliary equipment. It has the merit of allowing multi-component mixtures to be prepared as readily as binary mixtures if an appropriate number of critical flow orifices are used. If gas pre-mixtures are used in place of pure gases, smaller volume fractions can be obtained. Although it is more particularly applicable to the preparation of gas mixtures at atmospheric pressure, the method also offers the possibility of preparing calibration gas mixtures at pressures greater than atmospheric. The upstream pressure will need to be at least two times higher than downstream pressure. The range of flow rates covered by this standard extends from 1 ml/min to 10 l/min. |
| Keywords: | Analysis|Calibration|Calibration gases|Chemical analysis and testing|Control samples|Critical|Definitions|Dynamic|Gas analysis|Gas mixtures|Gas-volumetric analysis|Inspection equipment|Mathematical calculations|Methods|Nozzles|Orifices|Preparation|Production|Test gases|Volumetric|Volumetric analysis |
| ICS: | 71.040.40 - Análisis químico |
| CTN: | |
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Equivalencia Internacional |
Idéntica EN ISO 6145-6:2017 Idéntica ISO 6145-6:2017 |
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Reemplazo Normas |
Reemplaza a DIN EN ISO 6145-6:2008-11 Reemplaza a DIN EN ISO 6145-6:2016-05 |










