NOTICE: Due to a lapse in annual appropriations, most of this website is not being updated. Learn more.
Form submissions will still be accepted but will not receive responses at this time. Sections of this site for programs using non-appropriated funds (such as NVLAP) or those that are excepted from the shutdown (such as CHIPS and NVD) will continue to be updated.
An official website of the United States government
Here’s how you know
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Jodie G. Pope, Aaron N. Johnson, Bernard J. Filla, Joey T. Boyd, Vern E. Bean, Christopher J. Crowley
Abstract
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 proportionalintegralderivative (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
Pope, J.
, Johnson, A.
, Filla, B.
, Boyd, J.
, Bean, V.
and Crowley, C.
(2015),
NIST's Fully Dynamic Gravimetric Liquid Flowmeter Standard., 9th International Symposium on Fluid Flow Measurement , Arlington, VA, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=918213
(Accessed October 3, 2025)