This paper describes an 8-path ultrasonic flow meter, with emphasis on how this meter can be used as a master meter with traceability to appropriate standards. In particular the paper describes the methodology whereby transit time measurements and calibration factors can be established in factory and laboratory tests and then verified in the field. Simulations of distorted and swirling flows, and supporting test results are used to demonstrate the insensitivity of the 8-path configuration to installation effects.
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