Abstract
For the uncertainty analysis of the oil sealed wet gas meter, it was connected in series with the transfer standard using sonic nozzles and its performance was investigated experimentally on the flow rate range from 0.5g/min to 12g/min. The uncertainty analysis based on the experimental results showed that the extended uncertainty (coverage factor k=2) is from 0.4% to 0.6% on the above flow rate range, and some uncertainty components, the dead liquid level adjustment and the setting of the gas meter, are strongly affected by the operators and therefore the trained operator can reduce the extended uncertainty by 0.3%. The present experimental results also showed that the ambient condition, the atmospheric pressure and the temperature, is an important parameter for the accurate flow measurement that should be correctly evaluated, especially on lower flow rate range, but the influences of the ambient condition can be neglected when the flow rate is discussed on mass flow rate, not volume flow rate.
