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BS EN ISO 6145-1:2019

BS EN ISO 6145-1:2019

$142.49

Gas analysis. Preparation of calibration gas mixtures using dynamic methods – General aspects

Published By Publication Date Number of Pages
BSI 2019 32
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This document gives a brief overview of each of the dynamic techniques which are described in detail in the subsequent parts of ISOƂ 6145. This document provides basic information to support an informed choice for one or another method for the preparation of calibration gas mixtures. It also describes how these methods can be linked to national measurement standards to establish metrological traceability for the composition of the prepared gas mixtures.

Since all techniques are dynamic and rely on flow rates, this document describes the calibration process by measurement of each individual flow rate generated by the device.

Methods are also provided for assessing the composition of the generated gas mixtures by comparison with an already validated calibration gas mixture.

This document provides general requirements for the use and operation of dynamic methods for gas mixture preparation. It also includes the necessary expressions for calculating the calibration gas composition and its associated uncertainty.

Gas mixtures obtained by these dynamic methods can be used to calibrate or control gas analysers.

The storage of dynamically prepared gas mixtures into bags or cylinders is beyond the scope of this document.

PDF Catalog

PDF Pages PDF Title
2 undefined
4 European foreword
Endorsement notice
7 Foreword
8 Introduction
9 1 Scope
2 Normative references
3 Terms and definitions
10 4 Symbols
5 Principle
5.1 General
11 5.2 Suitability of the method to the application
5.3 Piston pumps
12 5.4 Continuous (syringe) injection
5.5 Capillary
5.6 Critical flow orifices
13 5.7 Thermal mass flow controller
5.8 Diffusion
5.9 Saturation
14 5.10 Permeation method
5.11 Electrochemical generation
5.12 Summary
15 6 Recommendations for handling the dynamic system
6.1 Safety considerations
6.1.1 Reactions between mixture components
16 6.1.2 Reactions with dynamic system materials
6.2 Quality considerations
6.2.1 Purity of parent gas standards or “zero” gas
6.2.2 Gas handling
7 Calibration methods of a dynamic system
7.1 Generalities on the calibration
17 7.2 Calibration of each element
7.2.1 General
18 7.2.2 Calibration devices for flow rate: Principle and uncertainty
21 7.3 Single point calibration of a dynamic system by comparison with reference gas mixtures
7.4 Calibration certificate
8 Calculation of the composition and its uncertainty
8.1 General
22 8.2 Calculations for volumetric methods
8.2.1 General
8.2.2 Formulae
23 8.3 Calculations for gravimetric methods
8.3.1 General
8.3.2 Formula
9 Sources of uncertainty and uncertainty of the final mixture
24 10 Verification
10.1 Principle
10.2 Verification criteria
10.3 Recalibration criteria
25 Annex A (normative) Calculation details
29 Annex B (informative) Atomic weights and molar masses
31 Bibliography

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BS EN ISO 6145-1:2019
$142.49