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BS EN ISO 6145-6:2017 Gas analysis. Preparation of calibration gas mixtures using dynamic methods - Critical flow orifices >
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BS EN ISO 6145-6:2017 Gas analysis. Preparation of calibration gas mixtures using dynamic methods - Critical flow orifices, 2017
- National foreword
- European foreword
- Foreword
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Symbols
- 5 Principle
- 6 Calculation of mass flow rate and volume flow rate
- 6.1 General
- 6.2 Calculation under ideal conditions
- 6.2.1 Calculation of mass flow rate
- 6.2.2 Calculation of volume flow rates
- 6.3 Calculation of mass flow rate using flow calibration with pure nitrogen
- 6.4 Flow rate uncertainty calculation
- 6.4.1 General
- 6.4.2 Sources of uncertainty
- 6.4.3 Uncertainty estimation
- 7 Calculation of amount of substance fraction and volume fraction and associated uncertainty evaluation
- 7.1 General
- 7.2 Amount of substance fraction calculation and associated uncertainty
- 7.2.1 Case of gases with purity ≥ 99,99 %
- 7.2.2 Case of pre-mixtures
- 7.3 Remarks about uncertainty for the amount fraction
- 8 Application to the preparation of gas mixtures
- 8.1 Example of a mixing system
- 8.2 Conditions of operation
- 9 Calibration and verification
- 9.1 General
- 9.2 Calibration of the mixing system in the flow rate
- 9.3 Calibration of the mixing system with gas mixtures for a specific gas and concentration
- 9.4 Verification of the mixing system
- Annex A (informative) Example of calculation of isentropic coefficient, viscosity and critical flow coefficient
- Annex B (informative) Calculation of mass and volume flow rates under real conditions
- Annex C (informative) Example of flow calculation for toroidal critical flow orifices under ideal and real conditions
- Annex D (informative) Calculation of mass flow rate using flow calibration with pure nitrogen: examples
- Bibliography [Go to Page]