Comparison in the range (0.5 Pa - 15 kPa), gauge and absolute

Project Description

The target of this comparison is to confirm the very low uncertainties claimed in the gauge and absolute pressure ranges from 0.5  Pa to 15 kPa. The comparison will be divided into two separate phases, each using a different transfer standard.

In the first phase the non-rotating digital piston gauge DHI FPG 8601 will serve as the transfer standard in the range (1 Pa  - 15  kPa), both gauge and absolute. The participants will be CME, CMI (pilot lab), INRIM, LNE, MIKES, NML (gauge mode only), PTB (from 30 Pa in absolute mode), SP (gauge mode only) and UME. The transfer standard will be the property of CMI and its staff will visit other laboratories for the subsequent bilateral comparisons resulting in a star comparison.   The nominal pressure points will be 1 Pa (optional), 3 Pa, 10 Pa, 30 Pa, 100 Pa, 300 Pa, 1  kPa, 3  kPa, 10 kPa and 15 kPa. The test gas will be nitrogen. A CDG will serve as a separator and zero indicator.
In the second phase two capacitance diaphragm gauges (CDG) connected together will serve as transfer standard in the absolute pressure ranges (0.5 Pa - 100 Pa) and (30 Pa - 13 kPa). The participants will be CMI, EIM, IMT, INRIM, LNE (pilot lab) and MIKES. The CDGs will be circulated on a star scheme base. The nominal pressure points will be:

• for the first CDG 0.5 Pa (optional), 1 Pa (optional), 3 Pa, 10 Pa, 30 Pa, 100 Pa,

•  for the second CDG 30 Pa, 100 Pa, 300 Pa, 1 kPa, 3 kPa, 10 kPa, and 13 kPa.

The test gas will be nitrogen.

Final Report 2015-04-08

The comparison has been comoleted and the results are available in the KCDB.

The target of this comparison was to confirm the very low uncertainties claimed in the gauge and absolute pressure ranges from 1 Pa to 15 kPa. However, due to schedule and financial reasons, the first phase with the participants were reduced to CMI, INRIM, LNE, MIKES and PTB.
The non-rotating digital piston gauge DHI FPG 8601 served as the transfer standard in the range (1 Pa - 15 kPa), both gauge and absolute. The transfer standard was the property of CMI leading to a set of the subsequent bilateral comparisons - a star comparison. The nominal pressure points were 1 Pa (optional), 3 Pa, 10 Pa, 30 Pa, 100 Pa, 300 Pa, 1 kPa, 3 kPa, 10 kPa and 15 kPa. The test gas was nitrogen. A CDG served as a separator and zero indicator.
The measurements were finished till the end of 2012. The successful results were sent to KCDB in March 2014. See KRAJÍČEK, Z., BERGOGLIO, M., JOUSTEN, K., OTAL, P., SABUGA, W., SAXHOLM, S., PRAŽÁK, D., VIČAR, M.: Final report on EURAMET.M.P-K4.2010: Key and supplementary comparison of national pressure standards in the range 1 Pa to 15 kPa of absolute and gauge pressure. Metrologia. Vol. 51 (2014), Tech. Suppl. 07002. doi:10.1088/0026-1394/51/1A/07002

Progress Report 2010-04-27

The target of this comparison is to confirm the very low uncertainties claimed in the gauge and absolute pressure ranges from 1 Pa to 15 kPa. The comparison was intended to be divided into two separate phases, each using a different transfer standard. However due to complications only the first phase with the non-rotating digital piston gauge DHI FPG 8601 as a transfer standard was kept and the second with CDG as the transfer standard had to be abandoned. The non-rotating digital piston gauge DHI FPG 8601 will serve as the transfer standard in the range (1 Pa - 15 kPa), both gauge and absolute. The transfer standard will be the property of CMI and its staff will visit other laboratories for the subsequent bilateral comparisons resulting in a star comparison. The nominal pressure points will be 1 Pa (optional), 3 Pa, 10 Pa, 30 Pa, 100 Pa, 300 Pa, 1 kPa, 3 kPa, 10 kPa and 15 kPa. The test gas will be nitrogen. A CDG will serve as a separator and zero indicator. The test gas will be nitrogen.
However time and financial reasons lead to reduction of the participants to pilot plus maximum five which (to make the transport easier) should be within Schengen area.
At the moment (April 2010) the comparison protocol was prepared with the help of MIKES and will be sent in May to other possible participants to be discussed.