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Title: Proving Liquid Meters With Microprocessor Based Pulse Outputs
Author: Don Augenstein,Matt Mihalcin
Source: 2007 International School of Hydrocarbon Measurement
Year Published: 2007
Abstract: Is there a fundamental issue with regard to the operation of Coriolis flowmeters and Ultrasonic transit-time flow meters such that proving them is difficult or impossible for certain applications? Experience certainly has shown that some applications of these meters has made the proving experience range from plain difficult to outright frustrating. This paper explains why some applications of these meters provide poor proving performance. Specifically, this paper discusses how these meters sample the flow rate and how they process the flow rate output. This paper details the fundamental sampling issue with these meters and provides thoughts on guidelines as to how to properly apply these meters with field provers. This paper does not discuss the physical explanation on the measurement statistics of either technology - but leaves that to other papers (such as Class 2430). These newer technologies use microprocessors to control their electronics, to communicate diagnostics, to sample their respective sensors, to compute the flow and to output volume/mass pulses. Because of this common dependence on the microprocessor, these two technologies, the UFM and Coriolis meters, will be collectively referred to as microprocessor based meters (MBM) - to emphasize this common design characteristic.

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