GB/T 5275.4-2014
Gas analysis.Preparation of calibration gas mixtures using dynamic volumetric methods.Part 4:Continuous syringe injection method (English Version)

Standard No.: GB/T 5275.4-2014
Language: Chinese, Available in English version
Release Date: 2014
Published By: General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
Latest: GB/T 5275.4-2014

Scope: This part of GB/T 5275 specifies the method of continuously injecting calibration components from pure gas or other mixed gases into the balance gas through a syringe, thereby continuously preparing a mixed gas containing two or more components for calibration. Using premixed gas instead of pure gas (see Appendix A) can prepare mixed gas with very low volume fraction. The volume flow determines the volume fraction and can be calculated from the flow of a single gas or can be measured independently using an appropriate method given in ISO 6145-1. The advantage of the continuous injection method is that a large amount of mixed gas can be prepared continuously, and as long as an appropriate number of syringes are used or a single syringe contains a known multi-component mixed gas, multi-component mixed gas can be prepared as conveniently as binary mixed gas. mixed composition. This method can also conveniently increase the volume fraction of calibration components in the mixed gas through few steps. Therefore, it can also be used to evaluate some other characteristics of gas analyzers, such as the minimum detection limit, dead zone and accuracy. The relative expanded uncertainty of binary gas mixture prepared by this method (inclusion factor k=2) is 5%, and the applicable range is 10^-5~10^-2 (volume fraction).

GB/T 5275.4-2014 Referenced Document

GB/T 10628-2008 Gas analysis.Comparison methods for determining and checking the composition of calibration gas mixtures
GB/T 5275.1-2014 Gas analysis.Preparation of calibration gas mixtures using dynamic volumetric methods.Part 1:Methods of calibration

2014 GB/T 5275.4-2014 Gas analysis.Preparation of calibration gas mixtures using dynamic volumetric methods.Part 4:Continuous syringe injection method