DIN EN ISO 16911-1:2013-06

This International Standard describes a method which uses point measurements of the flow velocity to determine the flow profile and mean and volumetric flows. It also provides for alternative methods based on tracer gas injection, which may be used to provide routine calibration for automated flow-monitoring systems and a method based on calculation from process conditions is also described. The standard provides guidance on when these alternative methods may be used. This International Standard requires all flow measurements to have demonstrable metrological traceability to national or international primary standards. The described method which was validated in field trials at plants in Denmark and Germany can typically achieve measurements with an uncertainty of 5 % at flow velocities of 20 m x s-1 .