BS ISO 6145-2:2014
$167.15
Gas analysis. Preparation of calibration gas mixtures using dynamic methods – Piston pumps
| Published By | Publication Date | Number of Pages |
| BSI | 2014 | 40 |
ISO 6145 comprises a series of International Standards dealing with various dynamic methods used for the preparation of calibration gas mixtures. This part of ISO 6145 describes a method and preparation system using piston pumps. The mixture composition and its associated uncertainty are based on calibration of the piston pumps by dimensional measurements.
The calibration gas mixtures prepared using this method consist of two or more components, prepared from pure gases or other gas mixtures using gas-mixing pumps. Such gas-mixing pumps contain at least two piston pumps, each driven with a defined ratio of strokes, and appropriate accessories for gas feeding and mixture homogenization.
This part of ISO 6145 is applicable only to mixtures of gaseous or totally vaporized components including corrosive gases, as long as these components neither react with each other nor with the wetted surfaces of the mixing pump. The use of gas mixtures as parent gases is covered as well. Multi-component gas mixtures and multi-step dilution procedures are included in this International Standard as they are considered to be special cases of the preparation of two-component mixtures.
This part of ISO 6145 describes a method of preparing calibration gas mixtures whose composition is expressed in volume fractions. The necessary equations and associated uncertainty evaluation to express the gas composition in amount–of–substance fractions are given in Annex A.
With this method, provided that sufficient quality assurance and control measures are taken, calibration gas mixtures can be prepared with a relative expanded uncertainty of 0,5 % (coverage factor k = 2) in the volume fraction. Numerical examples showing that under specified conditions smaller uncertainties are attainable are given in Annexes B through D.
Using this method, dilution ratios of 1:10 000 can be achieved in discrete increments. Lower fractions (down to 1 × 10−8) can be achieved by multi-stage dilution or by the use of gas mixtures as input gases. Final mixture flow rates of 5 l/h to 500 l/h can be realized depending on the equipment used.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 6 | Foreword |
| 7 | Section sec_1 Section sec_2 1 Scope 2 Normative references |
| 8 | Section sec_3 Section sec_3.1 Section sec_3.2 Section sec_3.3 Section sec_3.4 Section sec_3.5 Section sec_3.6 Section sec_4 3 Terms and definitions 4 Symbols |
| 9 | Section sec_5 Section sec_5.1 Section sec_5.2 5 Principle and equipment 5.1 Principle 5.2 Equipment |
| 10 | Table tab_b Figure fig_1 |
| 11 | Table tab_c Figure fig_2 Section sec_6 Section sec_6.1 6 Calibration gas mixture preparation 6.1 Safety issues |
| 12 | Section sec_6.2 6.2 Mixture feasibility |
| 13 | Section sec_6.3 Section sec_6.4 Section sec_6.5 Section sec_6.6 6.3 Preparation system and setting-up of mixture composition 6.4 Input pressure control 6.5 Temperature control 6.6 Homogenization |
| 14 | Section sec_6.7 Section sec_6.8 Section sec_6.9 6.7 Stability 6.8 Output pressure and flow pulsation 6.9 Composition of the parent gases |
| 15 | Section sec_7 Section sec_7.1 7 Calculation of volume fractions and associated uncertainty evaluation 7.1 Calculation method A |
| 16 | Section sec_7.2 Section sec_7.2.1 7.2 Calculation method B |
| 17 | Section sec_7.2.2 Section sec_7.2.3 |
| 18 | Section sec_8 8 Gas mixture composition verification |
| 19 | Annex sec_A Annex sec_A.1 Annex A (normative) Amount-of-substance fractions |
| 20 | Annex sec_A.2 |
| 21 | Annex sec_B Annex sec_B.1 Table tab_B.1 Annex B (informative) Uncertainty evaluation of the gas mixture composition |
| 22 | Annex sec_B.2 Annex sec_B.2.1 Annex sec_B.2.2 Table tab_B.2 |
| 23 | Annex sec_B.2.3 Annex sec_B.3 |
| 24 | Table tab_B.3 |
| 25 | Annex sec_B.4 |
| 26 | Table tab_d Figure fig_B.1 |
| 27 | Annex sec_C Annex sec_C.1 Annex sec_C.2 Annex C (informative) Gas mixture verification |
| 28 | Table tab_C.1 Annex sec_C.3 Annex sec_C.4 |
| 29 | Table tab_C.2 Annex sec_C.5 |
| 30 | Table tab_C.3 |
| 31 | Annex sec_D Annex sec_D.1 Table tab_D.1 Annex D (informative) Numerical example |
| 32 | Annex sec_D.2 Table tab_D.2 |
| 33 | Table tab_D.3 Annex sec_D.3 |
| 34 | Table tab_D.4 |
| 35 | Table tab_D.5 Table tab_D.6 Table tab_D.7 |
| 36 | Reference ref_1 Reference ref_2 Reference ref_3 Reference ref_4 Reference ref_5 Bibliography |
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