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1. Pass / Fail / Inconclusive Criteria for Inter-Laboratory Comparisons
Published: 4/14/2015
Authors: Blaza Toman, Bodo Mickan, Gerd Wubbeler, Olha Bodnar, Clemens Elster, John D Wright
Abstract: Inter-laboratory comparisons use the best available transfer standards to check participants uncertainty analyses, identify underestimated uncertainty claims or measurement errors, and improve the global measurement system. For some measurands (e.g. ...

2. The Effect of Liquid Kinematic Viscosity and Drain Time on the Volume Delivered from a Test Measure
Published: 4/14/2015
Authors: John D Wright, Sherry D Sheckels, Lachance Christian, Farhad Sharifi, Dominic Ondoro
Abstract: Volume test measures are used for calibration and traceability of petroleum measurements and their low uncertainty is important for the equitable trade of valuable liquids. The volume delivered from a test measure depends in part on the volume of liq ...

3. Thermal Effects on Critical Flow Venturis
Published: 4/14/2015
Authors: John D Wright, Aaron N Johnson, Michael R Moldover, Woong Kang, Liang Zhang
Abstract: Critical flow venturis (CFVs) are widely used as working and transfer standards for gas flow measurement because of their long-term calibration stability (< 0.06 %) and well developed physical model. At Reynolds numbers {I}Re{/I} < 2.5 {multiply} 10^ ...

4. Microwave Determination of the Volume of a Pressure Vessel
Published: 12/9/2014
Authors: Michael R Moldover, James W Schmidt, Keith A Gillis, James B. Mehl, John D Wright
Abstract: Using microwave techniques that are scalable to very large volumes, we measured the interior volume of a 0.3 m^u3^, commercially-manufactured, pressure vessel with an uncertainty of 0.05 %, as confirmed by independent, more-accurate, gas-expansion me ...

5. A Comparison of Primary Gas Flow Standards Spanning the Range 10 sccm N2 to 10 slm N2
Published: 7/27/2014
Authors: John D Wright, Casey Rombouts, Bair Michael, Jean Barbe, Rainer Kramer, Zdenek Krajicek
Abstract: We describe an international comparison of gas flow standards spanning the range 2.1 x 10-4 g/s (10 sccm) of nitrogen to 0.21 g/s (10 slm) of nitrogen. For all the participating laboratories, |En| < 0.78, where En is the difference between the part ...

6. Hydrogen Field Test Standard: Laboratory Performance
Published: 4/14/2014
Authors: Jodie G Pope, John D Wright
Abstract: NIST developed a prototype field test standard (FTS) that incorporates three test methods that could be used by state weights and measures inspectors to periodically test retail hydrogen dispensers, much as gasoline dispensers are tested today. The ...

7. Liquid Piston Prover Uncertainty Analysis Spreadsheet
Series: OTHER
Published: 3/25/2014
Authors: John D Wright, Aaron N Johnson, Jodie G Pope
Abstract: This publication is a spreadsheet that calculates the mass and volume flow uncertainty for a piston prover liquid flow standard based on user inputs of component uncertainties. The calculations use the basis equation and uncertainty analysis presen ...

8. Performance of Coriolis Meters in Transient Gas Flows
Published: 3/17/2014
Authors: Jodie G Pope, John D Wright
Abstract: NIST evaluated the instantaneous and totalized flow measured by two commercial coriolis meters under transient flow, pressure, and temperature conditions using a Transient Flow Facility (TFF) developed for this purpose. During a simulated cascade fi ...

9. Liquid Flow Meter Calibrations with the 0.1 L/s and 2.5 L/s Piston Provers
Series: Special Publication (NIST SP)
Report Number: 250-1039r1
Published: 1/15/2014
Authors: Jodie G Pope, John D Wright, Aaron N Johnson, Christopher J. Crowley
Abstract: This document provides a description of the 2.5 L/s and 0.1 L/s liquid flow calibration standards operated by the National Institute of Standards and Technology (NIST) Fluid Metrology Group to provide flow meter calibrations for customers. The 0 ...

10. Improved Nozzle Manifold for Gas Flow Calibrations
Published: 6/20/2012
Authors: Aaron N Johnson, Chunhui Li, John D Wright, Gina M Kline, Christopher J. Crowley
Abstract: We developed a new nozzle manifold that reduced the uncertainty of flow calibrations from 0.09 % to as low as 0.074 % for flows of air up to 0.84 kg/s (43 000 L/min at reference conditions of 101.325 kPa and 293.15 K). The nozzle manifold also reduc ...

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  • SP 250-XX: Calibration Services
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