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Title: Type Approval Of An Usm Using Oiml And ISO Perturbation Testing
Author: Martin Schlebach, Klaus Zanker
Source: 2013 Appalachian Gas Measurement Short Course
Year Published: 2013
Abstract: Advancements in metering technology, in particular gas and liquid ultrasonic meters, have greatly increased the range of applications for them, while reducing the uncertainty and improving installation effects immunity. However testing requirements to substantiate these claims have only recently been addressed in applicable standards and recommendations. ISO 17089 -1 (2010) and OIML R137 -1&2 (2012) specify a group of perturbation and performance tests that ensure meters installed in custody transfer applications perform within the specified uncertainty limits

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