GB/T 4844.3-1995 High purity helium

GB 4844.2-1995 Pure helium

GB 4844-1984 GB 4845-1984

GB/T 4844-2011 Pure helium,high pure helium and ultra pure helium

GB/T 4844.1 GB 4844.2-1995 Pure helium GB/T 5832.1-2003 Determination of moisture in gases—Part 1:Electrolytic method GB/T 5832.1-2016 Gas analysis—Determination of moisture—Part 1:Electrolytic method GB/T 8984-2008 Determination of carbon monoxide,carbon dioxide and hydrocarbon in gases—Gas chromatographic method GB/T 8984.1-1997 Determination of carbon monoxide,carbon dioxide and hydrocarbon in the gases—Part 1:Determination of carbon monoxide,carbon dioxide and mathane in the gases—Gas chromatographic method GB/T 8984.2-1997 Determination of carbon monoxide,carbon dioxide and hydrocarbon in the gases—Part 2:Determination of total content of carbon monoxide,carbon dioxide and hydrocarbon in gases—Gas chromatographic method GB/T 8984.3-1997 Determination of carbon monoxide,carbon dioxide and hydrocarbon in the gases—Part 3:Determination of total hydrocarbon in gases—Flame ionization method GB/T 5274-1985 Gas analysis—Preparation of calibration gas mixtures—Weighing methods GB/T 5274-2008 Gas analysis—Preparation of calibration gas mixtures—Gravimetric method GB/T 5274.1-2018 Gas analysis—Preparation of calibration gas mixtures—Part 1:Gravimetric method for class Ⅰ mixtures GB/T 10627-1989 Gas analysis—Preparation of calibration gas mixtures—Static volumetric methods GB/T 10628-1989 Gas analysis—Determination of composition of calibration gas mixtures—Comparison methods GB/T 10628-2008 Gas analysis—Comparison methods for determining and checking the composition of calibration gas mixtures GB/T 8984-2025 Gas analysis—Determination of the contents of trace carbon monoxide, carbon dioxide and hydrocarbon in gases—Gas chromatography with flame ionization detector