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Title: Pressure And Temperature Effects For Ormem Lange Ultrasonic Gas Flow Meters
Author: Per Lunde, Kjell-Eivind Frysa, Trond Folkestad
Source: 2008 North Sea Flow Measurement Workshop
Year Published: 2008
Abstract: Ultrasonic gas flow meters (USMs) may be influenced by pressure and temperature in several ways. Change of the meter bodys cross-sectional area (the pipe bore) influences directly on the amount of gas flowing through the meter. Change of the ultrasonic path geometry (i.e. change of the inclination angles and lateral chord positions, caused by e.g. meter body diameter change and change of the orientation of the ultrasonic transducer ports) influences on the transit times and the numerical integration method of the meter. Change of the Reynolds number influences on the integration method. Change of the length of the ultrasonic transducer ports influences on the acoustic path lengths, and thus on the transit times. Likewise, change of the length of the ultrasonic transducers influences on the acoustic path lengths, and thus on the transit times. In addition, changes of the transducer properties such as the directivity, influences on the diffraction correction, and thus on the transit times.

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