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Title: Static Gravimetric Method with Flying Start-and-Finish using High Speed Switching Valves for Calibration of Low Liquid Flow
Author: Kar-Hooi Cheong Ryouji Doihara Takashi Shimada Yoshiya Terao
Source: 2018 International Symposium on Fluid Flow Measurement
Year Published: 2018
Abstract: Static gravimetric (weighing) method with flying start-and-finish is widely used for calibration of large and medium liquid flow for its advantage of maintaining a continuous flow through the flowmeter. However one needs to take careful measures in implementing this method in low flow systems to obtain good accuracy. We adopted this calibration method using a pair of high speed switching valves as a diverter for flow range below 1 L/h at NMIJs small liquid hydrocarbon facility. This paper describes the design features and characteristics of the gravimetric system, and also discusses the timing error of the diverting valves as well as the evaporation rate of the weighing vessel. Performance tests show that, in terms of contribution to the overall uncertainty of standard flow rate, the gravimetric system is capable of measuring the time of liquid collection with a relative timing error within 0.002%, and the mass of liquid collection with a relative mass loss error (due to evaporation) below 0.015 % (tested under the most evaporative condition: both liquid (kerosene) and ambient temperatures set at 35 oC).

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