Standard Swedish standard · SS-EN ISO 6145-6:2017

Gas analysis - Preparation of calibration gas mixtures using dynamic methods - Part 6: Critical flow orifices (ISO 6145-6:2017)

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Standard Swedish standard · SS-EN ISO 6145-6:2017

Gas analysis - Preparation of calibration gas mixtures using dynamic methods - Part 6: Critical flow orifices (ISO 6145-6:2017)
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Scope
ISO 6145-6:2017 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.

Subjects

Chemical analysis (71.040.40)


Buy this standard

Standard Swedish standard · SS-EN ISO 6145-6:2017

Gas analysis - Preparation of calibration gas mixtures using dynamic methods - Part 6: Critical flow orifices (ISO 6145-6:2017)
Subscribe on standards - Read more Dölj
Price: 1 152 SEK
standard ikon pdf

PDF

Price: 1 152 SEK
standard ikon

Paper

Price: 1 843,20 SEK
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Product information

Language: English

Written by: Svenska institutet för standarder

International title:

Article no: STD-8028057

Edition: 2

Approved: 8/22/2017

No of pages: 40

Replaces: SS-EN ISO 6145-6:2008