Gas analysis. Preparation of calibration gas mixtures - Gravimetric method for Class II mixtures
Gas analysis. Preparation of calibration gas mixtures - Gravimetric method for Class II mixtures
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1 Scope This document describes the static gravimetric preparation of Class II calibration gas mixtures and describes a method for calculating the measurement uncertainty associated with the amount fraction of each component. In addition to all of the contributions to the measurement uncertainty mentioned in ISO 6142‑1, this document also considers the uncertainty resulting from the validation process for Class II mixtures that are not individually verified, as is the case for Class I mixtures. This document extends the uncertainty evaluation described in ISO 6142‑1 to include the effects of batch production and the verification process. It provides guidance on how to derive an uncertainty budget that is representative of a particular category of mixtures . Methods for the batch production of more than one mixture in a single process are included in this document. This document is only applicable to mixtures of gaseous or totally vaporized components, which can be introduced into the cylinder in the gaseous or liquid state. Both binary and multi-component gas mixtures are covered by this document. This document is limited to non-reactive molecules/components that are greater than or equal to an amount fraction of 100 μmol/mol. This document excludes components that react with each other, or with common mixture contaminants such as water vapour or oxygen or react with the inner surface of the cylinder and valve in the form of absorption or adsorption.
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