Codes & Standards - Purchase
ISO 16911-1:2013 requires all flow measurements to have demonstrable metrological traceability to national or international primary standards.
To be used as a standard reference method, the user is required to demonstrate that the performance characteristics of the method are equal to or better than the performance criteria defined in ISO 16911-1:2013 and that the overall uncertainty of the method, expressed with a level of confidence of 95 %, is determined and reported. The results for each method defined in ISO 16911-1:2013 have different uncertainties within a range of 1 % to 10 % at flow velocities of 20 m/s.
Methods further to these can be used provided that the user can demonstrate equivalence, based on the principles of CEN/TS 14793.