Abstract
Static gravimetric method with flying start-and-finish is widely used for calibration of large and medium liquid flow for its advantage of maintaining continuous flow through the flowmeter. However one needs to take careful measures in implementing this method in low flow systems to obtain good accuracy. At NMIJ/AIST, we adopted this calibration method using a pair of high speed switching valves as diverter for flow range below 1 L/h. This paper discusses the timing error of the diverting valves evaluated according to ISO4185 and also describes some of the main features of the gravimetric system using this high-speed switching valves.
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