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EN ISO 6145-4:2008

Current
Current

The latest, up-to-date edition.

Gas analysis - Preparation of calibration gas mixtures using dynamic volumetric methods - Part 4: Continuous syringe injection method (ISO 6145-4:2004)
Published date

08-20-2008

1 Scope
2 Normative references
3 Principle
4 Application to preparation of gas mixtures
  4.1 Description of the experimental procedure
  4.2 Area of validity
  4.3 Operating conditions
5 Expression of results
  5.1 Volume fraction
  5.2 Sources of uncertainty
  5.3 Uncertainty of volume fraction
Annex A (informative) Pre-mixed gases for preparation of
                      mixtures of high dilution
Annex B (informative) Example of apparatus for preparation
                      of calibration gas mixtures
Annex C (informative) Practical hints
Annex D (informative) Example of the determination of the
                      uncertainty in the concentration of a
                      calibration gas mixture prepared by the
                      continuous injection method
Bibliography

ISO 6145-4:2004 specifies a method for continuous production of calibration gas mixtures, containing two or more components, from pure gases or other gas mixtures by continuous injection of the calibration component(s) into a complementary gas stream by means of a syringe.If pre-mixed gases are used instead of pure gases (see Annex A), much lower volume fractions can be obtained. The volume flow rates, from which the volume fractions are determined, can be calculated from the individual flow rates and can be independently measured by a suitable method given in ISO 6145-1.The merits of the method are that a substantial quantity of the gas mixture can be prepared on a continuous basis and that multi-component mixtures can be prepared almost as readily as binary mixtures if the appropriate number of syringes is utilized, or if the syringe already contains a multi-component mixture of known composition. This method also provides a convenient means for increasing the volume fraction of the calibration component in the mixture in small steps. It is therefore a useful method for evaluation of other characteristics of gas analysers, such as minimum detection limit and dead zone, as well as accuracy. The relative expanded uncertainty in the volume fraction obtainable for a binary mixture (at a coverage factor of 2) is 5 % and the range of applicability is 10-5 to 10-2.

Committee
CEN/TC 238
DocumentType
Standard
PublisherName
Comite Europeen de Normalisation
Status
Current

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VDI 2100 Blatt 3:2011-10 Determination of gaseous compounds in ambient air - Determination of indoor air pollutants - Gas chromatographic determination of organic compounds - Active sampling by accumulation on adsorbents - Thermal desorption
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UNI EN 1076 : 2010 WORKPLACE EXPOSURE - PROCEDURES FOR MEASURING GASES AND VAPOURS USING PUMPED SAMPLERS - REQUIREMENTS AND TEST METHODS
UNI EN 838 : 2010 WORKPLACE EXPOSURE - PROCEDURES FOR MEASURING GASES AND VAPOURS USING DIFFUSIVE SAMPLERS - REQUIREMENTS AND TEST METHODS
DIN EN 838:2010-05 Workplace exposure - Procedures for measuring gases and vapours using diffusive samplers - Requirements and test methods
BS EN 14662-3:2015 Ambient air. Standard method for the measurement of benzene concentrations Automated pumped sampling with in situ gas chromatography
BS EN 838:2010 Workplace exposure. Procedures for measuring gases and vapours using diffusive samplers. Requirements and test methods
I.S. EN 1076:2009 WORKPLACE EXPOSURE - PROCEDURES FOR MEASURING GASES AND VAPOURS USING PUMPED SAMPLERS - REQUIREMENTS AND TEST METHODS
EN 838:2010 Workplace exposure - Procedures for measuring gases and vapours using diffusive samplers - Requirements and test methods

ISO/IEC Guide 98:1993 Guide to the expression of uncertainty in measurement (GUM)
ISO 6145-7:2009 Gas analysis Preparation of calibration gas mixtures using dynamic volumetric methods Part 7: Thermal mass-flow controllers
ISO 6143:2001 Gas analysis — Comparison methods for determining and checking the composition of calibration gas mixtures
ISO 7504:2015 Gas analysis Vocabulary
ISO 6145-1:2003 Gas analysis Preparation of calibration gas mixtures using dynamic volumetric methods Part 1: Methods of calibration

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