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Title: Verifying Gusm Accuracy And Stability Using Advanced Diagnostic Control Limits
Author: Martin Schlebach
Source: 2009 International School of Hydrocarbon Measurement
Year Published: 2009
Abstract: Advancements in the use and understanding of gas ultrasonic meters have been exponential over the last 5-6 years. GUSMs have the ability to provide a vast array of information due to the multiple measurement points and the ability to display flow patterns in three dimensions. These multiple measurements and the corresponding basic diagnostics were initially used to simply ensure that flow, even though distorted in some cases was measured accurately through the full velocity range of the meter. Over time manufacturers and users realized that additional, so called advanced diagnostics were available, these were first discussed by Klaus Zanker at the 2003 NEL SEAsia conference 1. Over time the number of advanced diagnostic values grew to what we currently use today, they include, but are not limited to the following: Profile factor, Symmetry, Cross Flow, Turbulence, ETA and Swirl angle. These values coupled with the original basic diagnostic values help ensure that both the meters performance and the assemblies dynamics remain constant. The nagging question has been how do I know if the meter and the system dynamics are within a range that ensures confidence in the meters operation and the systems accuracy, this will be discussed in the following pages. A basic understanding of ultrasonic meter operation and geometry is a prerequisite to fully understanding this topic, some basic information can be found in appendix A.

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