Skip to main content
U.S. flag

An official website of the United States government

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.

CCM Key Comparison in the Pressure Range 0.05 MPa to 1 MPa (Gas Medium, Gauge Mode) - Phase A1: Dimensional Measurements and Calculation of Effective Area

Published

Author(s)

G F. Molinar, B Rebaglia, A Sacconi, J C. Legras, G P. Vailleau, James W. Schmidt, John R. Stoup, D R. Flack, Waldimir Sabuga, O Jusko

Abstract

The results obtained by five laboratories in the determination of the effective areas of two gas-operated 10 cm2 piston-cylinder assemblies from dimensional measurements carried out as part, called phase A1, of a key comparison in the pressure range 0.05 MPa to 1 MPa under the auspices of the CCM are presented. The participants performed diameter, straightness and roundness measurements on piston and cylinder bore and calculated the effective area of the transfer standards by their own methods. The differences between diameters determined by the institutes are systematic and often many times larger than the uncertainties claimed by the participants. Nevertheless, all calculated effective areas agree with the reference values determined within the expanded uncertainties with a coverage factor 2, most of them even within their standard uncertainties. A choice of the calculation method seems not to be as important as the dimensional data themselves. The effective areas determined from the dimensional measurements are compared with those obtained in cross-float experiments referred to as phase A2 of the comparison and reported in a separate paper.
Citation
Metrologia

Keywords

1 mega Pascal, dead-weight testers, dimensions, international, phase A1, piston gages, pressure, Round Robin A1

Citation

Molinar, G. , Rebaglia, B. , Sacconi, A. , Legras, J. , Vailleau, G. , Schmidt, J. , Stoup, J. , Flack, D. , Sabuga, W. and Jusko, O. (2021), CCM Key Comparison in the Pressure Range 0.05 MPa to 1 MPa (Gas Medium, Gauge Mode) - Phase A1: Dimensional Measurements and Calculation of Effective Area, Metrologia (Accessed December 1, 2021)
Created October 12, 2021