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Title: Uncertainty Analysis Of Turbine And Ultrasonic Meter Volume Measurements - Part 2, Advanced Topics
Author: Thomas Kegel
Source: American Gas Association 2004
Year Published: 2004
Abstract: This paper continues from the first paper1 in describing the process of estimating the uncertainty of volume measurements made with turbine and ultrasonic flowmeters. Components that contribute uncertainty include the pressure and temperature transducers, the gas chromatograph, state equation and flow computer as well as the meter itself. In the first paper each component was described and numerical uncertainty values were estimated based on a hypothetical set of measurements. The individual component values were combined to provide the uncertainty in the total volume. The present paper discusses uncertainty issues associated with calibration, it is organized based on two examples. The first example concerns pressure transducer calibration, the second example discusses flowmeter calibration. Topics include short and long term random effects, percent-of-reading effects, and full-scale effects Additional discussion covers proper interpretation of flowmeter calibration results and guidance to replace manufacturer specifications with calibration results.

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