ISO 6142-1:2015 specifies a gravimetric method for the preparation of calibration gas mixtures in cylinders with traceable values for the amount-of-substance fraction (amount fraction) of one or more components. This part of ISO 6142 describes a method for calculating the uncertainty associated with the amount fraction of each component. This uncertainty calculation requires the evaluation of the contributions to the uncertainty due to factors including the weighing process, the purity of the components, the stability of the mixture, and the verification of the final mixture. ISO 6142-1:2015 is only applicable to mixtures of gaseous or totally vaporized components, which may be introduced into the cylinder in the gaseous or liquid state. Both binary and multi-component gas mixtures (including natural-gas type mixtures) are covered by this part of ISO 6142. Methods for the batch production of more than one mixture in a single process are not included in this part of ISO 6142. ISO 6142-1:2015 requires estimation of the stability of the mixture for its intended life time (maximum storage life), but it is not for use with components that react with each other unintentionally. This part of ISO 6142 also requires the impurities in each parent gas or liquid used in the preparation of the mixture to be assessed and quantified.
ISO 6142-1:2015 specifies a gravimetric method for the preparation of calibration gas mixtures in cylinders with traceable values for the amount-of-substance fraction (amount fraction) of one or more components. This part of ISO 6142 describes a method for calculating the uncertainty associated with the amount fraction of each component. This uncertainty calculation requires the evaluation of the contributions to the uncertainty due to factors including the weighing process, the purity of the components, the stability of the mixture, and the verification of the final mixture.
ISO 6142-1:2015 is only applicable to mixtures of gaseous or totally vaporized components, which may be introduced into the cylinder in the gaseous or liquid state. Both binary and multi-component gas mixtures (including natural-gas type mixtures) are covered by this part of ISO 6142. Methods for the batch production of more than one mixture in a single process are not included in this part of ISO 6142.
ISO 6142-1:2015 requires estimation of the stability of the mixture for its intended life time (maximum storage life), but it is not for use with components that react with each other unintentionally. This part of ISO 6142 also requires the impurities in each parent gas or liquid used in the preparation of the mixture to be assessed and quantified.
<p>L'ISO 6142:2001 spécifie une méthode gravimétrique de préparation des mélanges de gaz pour étalonnage dans des bouteilles dont l'exactitude de la composition a été prédéfinie. Elle est applicable uniquement aux mélanges de composants gazeux ou totalement vaporisés qui ne réagissent pas entre eux ou au contact des parois de bouteilles. Un mode opératoire pour une méthode de préparation est fourni avec un certain nombre d'exigences à respecter pour que la composition finale des mélanges gazeux se situe dans les niveaux d'incertitude préétablis. Les mélanges gazeux à plusieurs constituants (y compris le gaz naturel) et les mélanges à dilution multiple sont inclus dans l'ISO 6142:2001 et sont considérés comme des cas particuliers de la méthode de préparation gravimétrique à un seul constituant.</p> <p>L'ISO 6142:2001 décrit également la méthode de vérification de la composition des gaz pour étalonnage préparés par voie gravimétrique. Sous réserve de l'adoption, au cours de la préparation et de la validation de ces mélanges gazeux gravimétriques, de procédures rigoureuses et exhaustives d'assurance et de contrôle de la qualité, des gaz pour étalonnage de haute exactitude peuvent être obtenus pour une large gamme de mélanges gazeux, en comparaison avec d'autres méthodes de préparation pour ces mêmes gaz. </p>
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