GB/T 5274.1-2018Gas analysis -- Preparation of calibration gas mixtures -- Part 1: Gravimetric method for class I mixtures (English PDF)

1 Scope

This part of GB/T 5274 specifies a method for preparing a bottled calibration mixture by weighing, one or more of the calibration gas mixture.

The amount fraction (molar fraction) of the substance of each component can be traced back to the source. This section also specifies the calculation method for the uncertainty of the mole fraction of each component.

Method, the uncertainty calculation needs to evaluate the uncertainty contribution of the following factors, including. weighing process, component purity, mixture

The stability of the body and the verification of the final mixed gas.

This section applies only to the preparation of a mixed gas of gaseous or fully vaporizable components, which can be introduced into the cylinder in a gaseous or liquid state. this

Part of the preparation of binary or multi-component gas (including natural gas) is covered. This section does not include multiple mixed gas batch processes in a single process.

The method of preparation.

In order to determine the shelf life of the mixed gas (maximum storage period), this section specifies the method of stability evaluation, but this method does not apply to

Evaluation of the stability of components that react with each other. This section also specifies each raw material (gas or liquid) used to prepare the mixed gas.

Methods for quantitative analysis and evaluation of impurities in the process.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article.

Pieces. For undated references, the latest edition (including all amendments) applies to this document.

ISO 6141 Gas Analysis Calibration Mixed Gas Certificate Content (Gasanalysis-Contentsofcertificatesforcali-

Breakgasmixtures)

ISO 6143 Gas Analysis Calibration for the determination and calibration of mixed gas compositions (Gasanalysis-Comparison)

Methodsfordeterminingandcheckingthecompositionofcalibrationgasmixtures)

ISO 7504 Gas Analysis Glossary (Gasanalysis-Vocabulary)

ISO 14912 Gas Analysis Conversion of Mixture Gas Content (Gasanalysis-Conversion of Gasmixture

Compositiondata)

ISO 16664.2004 Gas Analysis Guide for the Use of Calibration Gases and Mixed Gases (Gasanalysis-Handlinganduse

Ofcalibrationgasesandgasmixtures-Guidelines)

ISO 19229 Gas Analysis Purity Analysis and Purity Data Processing (Gasanalysis-Purityanalysisandthe

Treatmentofpuritydata)

ISO /T S29041 Mixed Gas Weighing Method for Component Correlation Control (Gasmixtures-Gravimetricprepara- tion-Masteringcorrelationsincomposition)

ISO /IEC Guide 98-3 Measurement uncertainty - Part 3. Guide to measurement uncertainty (GUM..1995) (Uncertainty ofmeasurement-Part 3. Guidetotheexpressionofuncertaintyinmeasurement)

The relative atomic mass of an element [International Union of Theoretical and Applied Chemistry (IUPAC) Commissiononatomicweights

Andisotopicabundances. Atomicweightsoftheelements]

3 Terms and definitions

The terms and definitions defined by ISO 7504 and ISO /IEC Guide 98-3 apply to this document. […]