Reference number
ISO 6145-6:2017
International Standard
ISO 6145-6:2017
Gas analysis — Preparation of calibration gas mixtures using dynamic methods — Part 6: Critical flow orifices
Edition 3
2017-07
Read sample
ISO 6145-6:2017
60247
Published (Edition 3, 2017)

ISO 6145-6:2017

ISO 6145-6:2017
60247
Language
Format
CHF 151
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Abstract

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.

General information

  •  : Published
     : 2017-07
    : Close of review [90.60]
  •  : 3
     : 27
  • ISO/TC 158
    71.040.40 
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