GB/T 14070-1993 Pressure method for the preparation of mixed gases for calibrating in Gas Analysis. This standard describes the principle of pressure method preparation, relying on precise control of the pressure of each gas to determine the mixing ratio. Detail the required equipment, such as high-precision pressure gauges, vacuum devices, etc. Standardize the operation process, from the cleaning of the container, vacuuming, to the sequential charging of each gas pressing force value. The pressure method can precisely prepare the mixed gases for Gas Analysis, providing a reliable standard for Gas Analysis to ensure accurate analysis results. It is widely used in chemical industry, environmental protection and other fields that require Gas Analysis.