BS EN ISO 6145-1:2019

What is ISO 6145-1 - Preparation of calibration gas mixtures using dynamic methods about? 

ISO 6145-1 is the first part of the multi-series standard that is applicable to the preparation of calibration gas mixtures using dynamic methods. 

ISO 6145-1 gives a brief overview of each of the dynamic techniques which are described in detail in the subsequent parts of ISO 6145.  

ISO 6145-1 provides basic information to support an informed choice for one or another method for the preparation of calibration gas mixtures. It also describes how these methods can be linked to national measurement standards to establish metrological traceability for the composition of the prepared gas mixtures. 

Note: 

The storage of dynamically prepared gas mixtures into bags or cylinders is beyond the scope of this document. 

Who is ISO 6145-1 - Preparation of calibration gas mixtures using dynamic methods for?  

ISO 6145-1 on the preparation of calibration gas mixtures using dynamic methods is useful for: 

• Chemical industry 
• Testing laboratories 
• Manufacturer of dynamic system or device 

Why should you use ISO 6145-1 - Preparation of calibration gas mixtures using dynamic methods?  

ISO 6145-1 describes the calibration process by measurement of each individual flow rate generated by the device. 

ISO 6145-1 provides a dynamic method that will help you for assessing the composition of the generated gas mixtures by comparison with an already validated calibration gas mixture. 

ISO 6145-1 provides general requirements that will help you to use and operation of dynamic methods for gas mixture preparation. It also includes the necessary expressions for calculating the calibration gas composition and its associated uncertainty. 

Gas mixtures obtained by these dynamic methods are used to calibrate or control gas analysers. 

What’s changed since the last update? 

BS EN ISO 6145-1:2019 supersedes BS EN ISO 6145‑1:2008, which is withdrawn. 

The main changes compared to the previous edition are as follows. 

• The techniques for the preparation of gas mixtures are described in an abbreviated manner since there is no need to repeat the text and formulae from each of the different parts of the ISO 6145 series. However, a summary table (Table 1) presenting the advantages and limitations of each method has been introduced 
• Recommendations regarding the handling of the dynamic mixing systems and quality considerations have been added 
• The methods and instruments to calibrate a dynamic system have changed and are better described 
• The calculations to obtain composition and uncertainties are more detailed, and the different ways of mixing gases (volume flow rates or mass flow rates) have been taken into account 
• Clauses on certificates (7.4) and verification (Clause 10) have been added