Name: UNI EN ISO 6145-8 : 2009
Brand: UNI

GAS ANALYSIS - PREPARATION OF CALIBRATION GAS MIXTURES USING DYNAMIC VOLUMETRIC METHODS - PART 8: DIFFUSION METHOD

Published date

01-22-2009

Publisher

Ente Nazionale Italiano di Unificazione (UNI)

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