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Title: Proving Liquid Ultrasonic Meters
Author: Ernest m. Hauser
Source: 2013 International School of Hydrocarbon Measurement
Year Published: 2013
Abstract: In-Situ Proving is one of the processes by which a flow meters accuracy can be assured in service. Alternatives to in-situ proving are transferring of lab calibrations to the field, or using a secondary transfer standard called a master meter. Proving is involved in all calibrations of all liquid meters at one point in the process, whether during initial calibrations or by proving a transfer standard and then comparing the transfer standard to the meter in service or under calibration. In-Situ Proving has the advantage of providing the smallest uncertainty since it is a direct comparison of the working meter to the reference standard. A prover is a device that provides a known reference volume, when a cylinder or a ball passes between two position switches, which can be compared to the volume measured by the working meter during the same period and in the same conditions. In this way other variables can be eliminated and the working meter can be corrected to the reference volume by means of a meter factor.

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