Final Report on the Key Comparison CCM.P-K5 in Differential Pressure From 1 Pa to 1000 Pa

Published

January 1, 2003

Author(s)

A P. Miiller, G Cignolo, M P. Fitzgerald, M P. Perkin, M Sardi, Philip A. Simpson

Abstract

This report describes a CCM key comparison of low differential-pressure standards at four National Measurement Institutes (NMIs) that was carried out during the period July 1998 to May 1999 in order to determine their degrees of equivalance at pressures in the range 1 Pa to 1000 Pa. The differential pressures were superimposed on a line pressure of nominally 100 kPa. The primary standards, which represent two principal measurement methods, included three liquid-column manometers and one double pressure balance. The transfer standard package consisted of four high-precision pressure transducers, two capacitance diapragm gauges to provide high resolution at low differential pressures, and two resonant silicon 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, and NPL-UK) and Package B being circulated through the Asia-Pacific region (MSL-NZ). 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 of 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 result identified as an outlier, the measurement standards were generally found to be equivalent relative to the KCRVs, though a few 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

Volume

39

Pub Type

Journals

Keywords

CCM key comparison, degrees of equivalence, low absolute pressure

Citation

Miiller, A. , Cignolo, G. , Fitzgerald, M. , Perkin, M. , Sardi, M. and Simpson, P. (2003), Final Report on the Key Comparison CCM.P-K5 in Differential Pressure From 1 Pa to 1000 Pa, Report of the Consultive Committee for Mass and Related Quantities (Accessed March 13, 2025)