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Title: Proving Liquid Ultrasonic Meters
Author: Christopher B. Laird
Source: 2011 International School of Hydrocarbon Measurement
Year Published: 2011
Abstract: Proving is the process that determines the accuracy of a meter. A prover is a device with detector switches that define a precise, known volume. The prover is connected in series with the meter being proved so that as flow passes through the meter, the same flow, and only that flow must pass through the prover. The flow moves the displacer in the prover until it touches the first detector switch, the pulses coming from the meter start being counted by a prover counter. When the displacer touches the second detector switch, the pulses from the meter stop being counted. In this way, the exact number of pulses generated by the meter for an exact amount of flow is determined and the actual volume registration of the meter can be compared to the known volume of the prover. The ratio of the volume of the prover to the volume registered by the meter is called the Meter Factor. The proving process involves taking the average of several tests (comparisons) of the above mentioned ratio and checking the consistency of the tests. For example, if 5 tests or proving runs are made, the ratios must agree within 0.05%. If they do, then statistically, the uncertainty of the average Meter Factor will be within 0.027% and will meet industry requirements

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