Report on the Key Comparison CCM.P-K4 in Absolute Pressure From 1 Pa to 1000 Pa

Published

October 16, 2008

Author(s)

A P. Miiller, M Bergoglio, N Bignell, Kitty Fen, S S. Hong, Karl Jousten, Pardeep Mohan, R J. Redgrave, M Sardi, D Simpson

Abstract

This report decribes a CCM key comparison of low absolute-pressure standards at seven National Measurement Institutes (NMIs) that was carried out during the period March 1998 to September 1999 in order to determine their degrees of equivalence at pressures in the range 1 Pa to 1000 Pa. The primary standards, which represent two principal measurement methods, included five liquid-column manometers and four static expansion systems. The transfer standard package consisted of four high-precision pressure transducers, two capacitance diaphragm gauges to provide high resolution at low pressures, and two resonant silcon gauges to provide the required calibration stability. Two nominally identical transfer packages were used to reduce the time required for the measurements, with Package A being circulated among laboratories in the European region (IMGC, NPL-UK and PTB) and Package B being circulated among laboratories in the Asia-pacific region (CSIRO, KRISS, and NPL-I). The results obtained with different transfer packages were normalized by using data obtained from simultaneous calibrations of the two packages at the pilot laboratory (NIST). The degrees fo equivalence of the measurement standards were determined in two ways, deviations from key comparison reference values (KCRVs) and pairwise differences between these deviations. Apart from a few results identified as outliers, the measurement standards were generally found to be equivalent relative to the KCRVs, though some additional instances of nonequivalence were observed between given pairs of standards. The results revealed no significant relative bias between the two principal methods tested by this comparison.

Citation

Report of the Consultive Committee for Mass and Related Quantities

Pub Type

Journals

Keywords

CCM key comparison, degrees of equivalence, low absolute pressure

Citation

Miiller, A. , Bergoglio, M. , Bignell, N. , Fen, K. , Hong, S. , Jousten, K. , Mohan, P. , Redgrave, R. , Sardi, M. and Simpson, D. (2008), Report on the Key Comparison CCM.P-K4 in Absolute Pressure From 1 Pa to 1000 Pa, Report of the Consultive Committee for Mass and Related Quantities (Accessed November 8, 2024)