GB/T 5275.2-2022 Gas analysis—Preparation of calibration gas mixtures using dynamic methods—Part 2:Piston pumps

Scope

GB/T 5275 (all parts) specifies various methods for preparing calibration gas mixtures using dynamic methods. This document is Part 2 of GB/T 5275, which specifies the method of using piston pumps to continuously generate calibration gas mixtures. The calibration of piston pumps is carried out by geometric measurement methods, allowing the determination of the composition and uncertainty of the prepared calibration gas mixtures. Using pure gases or gas mixtures, calibration gas mixtures containing two or more components can be prepared using gas mixing pumps. This gas mixing pump consists of at least two piston pumps, each with a defined stroke ratio and suitable intake and mixing devices. This document is only applicable to gaseous mixtures or mixtures composed of components that can be completely vaporized. When the gas components do not react with each other or adsorb or react on the inner wall of the piston pump, this document is also applicable to cases where corrosive gases are used as raw gases. This document is also applicable to cases where mixed gases are used as raw gases. At the same time, the preparation of multi-component gas mixtures and the preparation process of multi-step dilution can be considered as special cases of the preparation of two-component mixtures, and the preparation methods specified in this document can also be used. The components of the calibration gas mixtures prepared using the methods specified in this document are expressed in terms of volume fraction. Appendix A provides the conversion equation between volume fraction and molar fraction data and the related uncertainty evaluation. When sufficient quality assurance measures and measurement control methods are adopted, the relative expanded uncertainty of the volume fraction of the gas mixtures prepared using this method can reach no more than 0.5% (including the factor k=2). Appendix B and Appendix D provide calculation examples of some special cases with smaller relative expan

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