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  • BSI
    BS EN ISO 6145-6:2017 Gas analysis. Preparation of calibration gas mixtures using dynamic methods - Critical flow orifices
    Edition: 2017
    $435.81
    / user per year

Description of BS EN ISO 6145-6:2017 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.



Standard NumberBS EN ISO 6145-6:2017
TitleGas analysis. Preparation of calibration gas mixtures using dynamic methods - Critical flow orifices
StatusConfirmed
Publication Date2017-09-04
ReplacesBS EN ISO 6145-6:2008
Identical National Standard OfISO 6145-6:2017, EN ISO 6145-6:2017
DescriptorsFlow measurement, Formulae (mathematics), Error analysis, Errors, Flow rates, Orifice flowmeters, Volumetric analysis, Mixtures, Calibration, Gas analysis
ICS71.040.40 Chemical analysis
CommitteePTI/15
ISBN978 0 580 79572 5
PublisherBSI
Pages34

About BSI

BSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses.
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