UNI EN ISO 6145-11 : 2009

Foreword
Introduction
1 Scope
2 Normative references
3 Procedure
  3.1 Principle
  3.2 Complementary gas
  3.3 Electrolytic systems for gas generation
  3.4 Apparatus
      3.4.1 Cell construction
      3.4.2 Current supply and gas flow control
  3.5 Gas mixture preparation
      3.5.1 Complementary gas
      3.5.2 Voltage supply
      3.5.3 Calculation of gas mixture content
4 Uncertainty evaluation
  4.1 Introduction
  4.2 Sources of uncertainty
      4.2.1 Complementary gas flow
      4.2.2 Gas generation
      4.2.3 Absorption of generated gas in the
            cell electrolyte
      4.2.4 Effect of moisture content
      4.2.5 Effect of temperature
      4.2.6 Purity of electrolytic chemicals
      4.2.7 Impurities in complementary gas
  4.3 Uncertainty of volume fraction
5 Electrochemical cell design
Annex A (informative) - Example of a commercial
        electrochemical cell
Annex B (informative) - Schematics of electrolytic
        cells used for gas generation
Annex C (informative) - Schematic of electrical
        supply to gas generation cell
Annex D (informative) - Decomposition voltages
        of solutions between smooth platinum
        electrodes
Bibliography

Describes a method for the preparation of calibration gas mixtures by using electrochemical generation of a calibration component and introduction into a complementary gas flow.