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BSI BS EN ISO 6145-6:2017

Gas analysis. Preparation of calibration gas mixtures using dynamic methods -- Critical flow orifices
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BSI BS EN ISO 6145-6:2017

Gas analysis. Preparation of calibration gas mixtures using dynamic methods -- Critical flow orifices

PUBLISH DATE 2017
PAGES 34
BSI BS EN ISO 6145-6:2017

This document specifies 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.

The method applies principally to the preparation of mixtures of non-reactive gases that do not react with any of the materials forming the gas circuit inside the critical flow orifices system or auxiliary equipment. It has the merit of allowing multi-component mixtures to be prepared as readily as binary mixtures if an appropriate number of critical flow orifices are used.

By selecting appropriate combinations of critical flow orifices, a dilution ratio of 1 × 104 is achievable.

Although it is more particularly applicable to the preparation of gas mixtures at atmospheric pressure, the method also offers the possibility of preparing calibration gas mixtures at pressures greater than atmospheric. The upstream pressure will need to be at least two times higher than downstream pressure.

The range of flow rates covered by this document extends from 1 ml/min to 10 l/min.

SDO BSI: British Standards Institution
Document Number ISO 6145-6
Publication Date Sept. 4, 2017
Language en - English
Page Count 34
Revision Level
Supercedes
Committee PTI/15
Publish Date Document Id Type View
Sept. 4, 2017 BS EN ISO 6145-6:2017 Revision
May 16, 2003 BS EN ISO 6145-6:2008 Revision
May 16, 2003 BS ISO 6145-6:2003 Revision
Feb. 28, 2009 BS EN ISO 6145-6:2008 Consolidated