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Title: Benefits Of Flow Calibrating Ultrasonic Meters
Author: John Lansing
Source: American Gas Association 2002
Year Published: 2002
Abstract: In the recent past users purchased ultrasonic meters (USMs) and often installed them without flow calibration. This may have been due in part because AGA Report No. 9 does not require flow calibration. Also, calibration facilities in North America a few years ago could not provide a full capacity test on 10-inch and larger meters. AGA 9 did, however, require the manufacturer to build meters that were within 0.7% for 12-inch and larger, and within 1.0% for 10- inch and smaller, prior to calibration. Of course, without flow calibration, there was always the chance a meter wouldnt meet this requirement.

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