The purpose of this standard is to provide the means for producing, by the weight method, mixtures of gases for calibration whose relative precis on on the concentration value of each of the constituents is better than 1%, whatever they may be. are the values of the chosen concentrations.
NBN T 97-101-1979 history
1979NBN T 97-101-1979 Preparation of calibration gas mixtures - Weighing method