EURAMET 1047. EURAMET Key comparison of National Standards in the range from 1 Pa to 15kPa in gauge mode

In order to validate a new pressure balance based on the piston gauge principle with piston-cylinder unit having large effective area, INRIM decided to partecipate at EURAMET 1047 comparison in the pressure ranges from 1 Pa to 15 kPa. The non-rotating digital piston gauge DHI FPG 8601 serves as the transfer standard in the range (1 Pa - 15 kPa), both gauge and absolute. The transfer standard (of CMI property) and its staff visited INRIM laboratories in the week from 25 to 29 October for the bilateral comparison resulting in a star comparison. A CDG serves as a separator and zero indicator. INRIM participation to the comparison was limited in gauge mode. The present report describes the INRIM results by using DHI FPG 8601 digital piston gauge including the evaluation of the uncertainties