Interlaboratory comparison in the pressure range 0 to 13 000 Pa (differential mode), and 0,1 to 13 000 Pa (absolute mode)
Project Description
The scopes of the project are :
- to compare the standards and the methods used in both laboratories in the low differential and absolute pressure range
- to evaluate the performances of the CDGs (repeatability, linearity, effect of line pressure)
Three differential CDGs of the two laboratories are circulated in such a way that their own CDGs are calibrated before and after the circulation in both laboratories. Their ranges are 0 to 130 Pa, 0 to 1300 Pa and 0 to 13 kPa respectively.
The comparison work is scheduled in January to March 2002.
Final Report 2004-03-05
The aims of the project were:
- to compare the standards and methods used in both laboratories in low differential and absolute pressure range
- to evaluate the performances of the CDGs (repeatability, linearity, effect of line pressure)
Three differential CDGs of the two laboratories were circulated so that their own CDGs were calibrated before and after the calibration in the other laboratory. The ranges of the CDGs were 0 to 130 Pa, 0 to 1300 Pa and 0 to 13 kPa respectively.
The measurements were completed in 2003 and a paper on the results was presented in the IMEKO TC16 conference:
J.-C. Legras, P. Otal; M. Rantanen and S. Semenoja: Bilateral Inter-Laboratory Comparison between BNM-LNE and MIKES in the Pressure Ranges 0 to 13 kPa Gauge and 0.1 Pa to 13 kPa Absolute, in Proceedings of International Symposium on Pressure and Vacuum, IMEKO TC16, Beijing, China, Sept. 22 – 24, 2003, pp. 79-83.
The agreement between the results obtained for all the CDGs in the two laboratories was within 5 x 10-4 x p. This is well within the estimated combined uncertainties.
The linearity of the CGDs was confirmed using several types of standards. The results obtained with the digital piston manometer of MIKES confirmed the independence of the output signal of the transducers: the relative difference in the calibration coefficients determined in gauge and absolute modes were less than 1 x 10-4 for the CDGs of BNM-LNE.