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Title: Investigations Of Density Transducers For Natural Gas Metering
Author: F. Weber
Source: 2003 North Sea Flow Measurement Workshop
Year Published: 2003
Abstract: In two ring tests two different sets, each consisting of four density transducers for natural gas metering were calibrated in the range up to 90 kgm-3 at 20 C. The density transducer is a vibrating cylinder or fork surrounded by the gas whose density determines the resonance frequency of the vibration. The differences between the results obtained by the different participants in the ring tests amounted to 0,04 percent. They were larger than was expected from the uncertainty of the instruments which had been employed for the calibration. Additionally, three different correction equations for the VoS effect are discussed. Density transducers calibrated with nitrogen and corrected for the VoS effect in methane still deviated by up to 0,05 kgm-3. The deviations due to the VoS effect in two investigated mixtures amounted up to 0,15 percent. The relatively small temperature dependence of the transducers is compared with that obtained in the experiment. An overall uncertainty of 0,2 percent is estimated.

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