Table of Contents

Foreword<br>1 Scope<br>2 Normative references<br>3 Terms and definitions<br>4 Symbols<br>5 Principle<br>6 Calculation of mass flow rate and volume flow rate<br>7 Calculation of amount of substance fraction and<br>&nbsp;&nbsp;volume fraction and associated uncertainty evaluation<br>8 Application to the preparation of gas mixtures<br>9 Calibration and verification<br>Annex A (informative) - Example of calculation of<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;isentropic coefficient, viscosity and critical flow<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;coefficient<br>Annex B (informative) - Calculation of mass and<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;volume flow rates under real conditions<br>Annex C (informative) - Example of flow calculation<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;for toroidal critical flow orifices under ideal and<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;real conditions<br>Annex D (informative) - Calculation of mass flow rate<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;using flow calibration with pure nitrogen: examples<br>Bibliography

Abstract

Describes a method for the dynamic preparation of calibration gas mixtures containing at least two gases (usually one of them is a complementary gas) from pure gases or gas pre-mixtures using critical flow orifices systems.

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Published
Document Type	Standard
Status	Current
Publisher	British Standards Institution
Pages
ISBN
Committee	PTI/15
Supersedes	16/30266428 DC : DRAFT MAR 2016 BS ISO 6145-6 : 2003 97/125573 DC : DRAFT OCT 1997 BS 4559-5.6(1987) : 1987