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Overall Measurement Accuracy

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October 10, 2019

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This paper presents methods for determining the uncertainty of both differential and positive metering stations. It takes into account the type of meter, number of meters in parallel, type of secondary instruments, and the determination of physical properties. The paper then relates this information to potential influence on system balance


Gas measurement uncertainty is a function of the following items:

➢ Selection of the appropriate metering device.
➢ Correct Installation of the metering device.
➢ Proper meter operation and processing of the metering information. ➢ Proper maintenance of the metering device.

Understanding how measurement uncertainty applies to metering requires a basic knowledge of the terminology and assumptions used in the calculation of measurement uncertainty.

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