BS EN ISO 6145-6:2017
Current
The latest, up-to-date edition.
Gas analysis. Preparation of calibration gas mixtures using dynamic methods Critical flow orifices
Hardcopy , PDF
English
04-09-2017
Important note : Users cannot be edited or removed once added to your Multi user PDF.| Committee |
PTI/15
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| DevelopmentNote |
Renumbers and supersedes BS ISO 6145-6. 2008 version incorporates corrigendum to BS ISO 6145-6. Supersedes BS 4559-5.6(1987) & 97/125573 DC. (02/2009) Supersedes 16/30266428 DC. (09/2017)
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| DocumentType |
Standard
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| Pages |
36
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| PublisherName |
British Standards Institution
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| Status |
Current
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| Supersedes |
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 1ml/min to 10l/min.
| Standards | Relationship |
| EN ISO 6145-6:2017 | Identical |
| ISO 6145-6:2017 | Identical |
| ISO 12963:2017 | Gas analysis — Comparison methods for the determination of the composition of gas mixtures based on one- and two-point calibration |
| ISO 9300:2005 | Measurement of gas flow by means of critical flow Venturi nozzles |
| ISO 16664:2017 | Gas analysis — Handling of calibration gases and gas mixtures — Guidelines |
| ISO 6143:2001 | Gas analysis — Comparison methods for determining and checking the composition of calibration gas mixtures |
| ISO 19229:2015 | Gas analysis Purity analysis and the treatment of purity data |
| ISO 14912:2003 | Gas analysis — Conversion of gas mixture composition data |
| VDI 3490 Blatt 16:1994-10 | Measurement of gases - Calibration gas mixtures - Dynamic preparation with critical orifice systems |
| ISO 7504:2015 | Gas analysis Vocabulary |
| ISO/IEC Guide 98-3:2008 | Uncertainty of measurement — Part 3: Guide to the expression of uncertainty in measurement (GUM:1995) |
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