A dynamic gravimetric standard for liquid flow measurements

Abstract An improved primary method for the calibration of liquid flow meters based on dynamic weighing has been adopted at Istituto Nazionale di Ricerca Metrologica. Compared to other methods currently in use, submerged jet flows, proposed advantage not requiring correction hydrostatic buoyancy force exerted immersed tube. This is possible since immersion depth tube held constant during process, entailing, consequently, a back pressure outlet section and more stable meniscus outer surface, which both improve accuracy measurement. Although present apparatus tested range between 10 kg h −1 60 , this would be particularly suitable lower rate as well. The results have shown that relative uncertainties order 0.01% can obtained.