Abstract
A new volumetric standard system has been developed capable of calibrating gas flow meters continuously. It is made of double concentric spheres. The inner sphere defines a basic volume that is divided into two parts by a flexible diaphragm. A water draw method used to measure this volume gave 25.343 l with 1 ml uncertainty. A changing pressure signal causes a change of flow direction every cycle. A careful treatment of this transient signal provides corrections to the basic formula for the mass flow rate. An uncertainty analysis of the new standard system shows that the most important factor is air temperature. Multiple nozzles were calibrated singly and in parallel by the new system to check the upper limit of the flow rate which is about 2 m 3/h with 0.15% expanded uncertainty.
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