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Title: When Should A Gas Ultrasonic Flow Meter Be Recalibrated?
Author: Jim Hall Klaus Zanker Eric Kelner
Source: 2010 North Sea Flow Measurement Workshop
Year Published: 2010
Abstract: How often and under what circumstances should a gas ultrasonic flow meter (USM) require recalibration? Within the Natural Gas Industry in most countries, there are currently either no standards requiring periodic recalibration or a standard based on arbitrary criteria. Removing an USM from service for recalibration is costly and inconvenient. However, the primary reason that a recalibration standard does not exist is the lack of definitive data regarding the long-term stability of installed USMs and data regarding the effect of replacing transducers, electronics and firmware

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