Abstract. The EUROMET project No 861 is organised using the same procedures as for the CCM.P-K1.b key comparison, in the pressure range 0.04 MPa to 1.75 MPa. LNE participated in the CCM.P-K1.b comparison as co-pilot. Key pressure points 100 kPa, 500 kPa and 1 MPa have been selected in the present comparison in order to allow a link to the CCM one.

A pressure balance equipped with a piston–cylinder of 200 mm² effective area is compared to the pressure standards of each participating institute in the range 0.04 MPa to 1.75 MPa. From these measurements, the effective area at null pressure of the assembly is calculated. The results are compared to those obtained in the CCM.P-K1.b comparison.

Main text. To reach the main text of this Paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/.

The final report has been peer-reviewed and approved for publication by EUROMET, according to the provisions of the CIPM Mutual Recognition Arrangement (MRA).