UNI EN ISO 6145-8 : 2009
Current
The latest, up-to-date edition.
GAS ANALYSIS - PREPARATION OF CALIBRATION GAS MIXTURES USING DYNAMIC VOLUMETRIC METHODS - PART 8: DIFFUSION METHOD
22-01-2009
Foreword
Introduction
1 Scope
2 Normative references
3 Principle
4 Reagents and materials
5 Apparatus
6 Procedure
6.1 Preliminary checks and operating conditions
6.2 Determination of mass loss
7 Expression of results
7.1 Calculation
7.2 Sources of uncertainty
Annex A (informative) - Practical example of a diffusion
cell calibrator configured for evaluating speed
of response in a hygrometer
Annex B (informative) - Example of performances of
diffusion cells for toluene and trichloromethane
Annex C (informative) - Example of uncertainty
calculations for a periodic weighing system
Bibliography
Describes a dynamic method using diffusion for the preparation of calibration gas mixtures containing component mole fractions ranging from 10[-9] to 10[-3].
| DocumentType |
Standard
|
| PublisherName |
Ente Nazionale Italiano di Unificazione (UNI)
|
| Status |
Current
|
| Standards | Relationship |
| EN ISO 6145-8:2008 | Identical |
| ISO 6145-8:2005 | Identical |
| ISO 6145-7:2009 | Gas analysis Preparation of calibration gas mixtures using dynamic volumetric methods Part 7: Thermal mass-flow controllers |
| ISO 6143:2001 | Gas analysis — Comparison methods for determining and checking the composition of calibration gas mixtures |
| ISO 6145-1:2003 | Gas analysis Preparation of calibration gas mixtures using dynamic volumetric methods Part 1: Methods of calibration |
| ISO 6145-6:2017 | Gas analysis — Preparation of calibration gas mixtures using dynamic methods — Part 6: Critical flow orifices |
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