NIST's Fully Dynamic Gravimetric Liquid Flowmeter Standard.

Published: April 13, 2015


Jodie G. Pope, Aaron N. Johnson, Bernard J. Filla, Joey T. Boyd, Vern E. Bean, Christopher J. Crowley


We describe a new dynamic, gravimetric, liquid flow standard (LFS) that determines flow by measuring the rate of change of the liquid mass accumulating in a collection tank. The LFS is a fully- automated,15 kg/s system that uses a proportional–integral–derivative (PID) control loop to achieve liquid flows with a stability that is the smaller of 0.001 % or 0.1 kg/s. The expanded uncertainty (corresponding to 95 % confidence level) is 0.021 % for the flow range of the standard; 15 kg/s to 0.22 kg/s. We verify the uncertainty budget by comparing the LFS results with two well-established NIST primary flow standards.
Proceedings Title: 9th International Symposium on Fluid Flow Measurement
Conference Dates: April 14-17, 2015
Conference Location: Arlington, VA
Pub Type: Conferences

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dynamic liquid flow, liquid flow primary standard, gravimetric standard
Created April 13, 2015, Updated February 19, 2017