Comparison in the negative gauge pressure range from -950 to 0 hPa
Project Description
Negative gauge pressures are a common range for pressure calibrations although uncertainty requirements in this range are not generally very high. In this area, a comparison (EURAMET project n° 1131) between four participants in the range -95 kPa to 95 kPa was carried out in 2009. Two of the four participants had results out of claimed uncertainties. The results suggest that the negative gauge pressures are more difficult to be measured as generally assumed. A new comparison with more participants is now proposed in the range -95 kPa to 0 kPa. The new comparison will be carried out in two loops defined by different standards.
The first loop will be piloted by MIKES and the transfer standard will be the same as the one used in the comparison project n° 1131: a Beamex MC5 multifunction calibrator equipped with a INT1C pressure transducer for the nominal range -1 bar ... 1 bar, operating on clean air or nitrogen. Its resolution is 1 Pa. The participants for the first loop are: BEV (AT), CMI (CZ), DANIAmet-FORCE (DK), EIM (GR), FSB-LPM (HR), INM (RO), LNE (FR), METROSERT (EE), MIKES (FI), NSAI (IE), UME (TR).
The second one will be piloted by LNE and the transfer standard that will be used is an RPM4 A160Ks with a resolution of 0,1 Pa. The participants for the second loop are: CEM (ES), CMI (CZ), LNE (FR), METAS (CH), MKEH (HU), PTB (DE), UME (TR).
Final Report 2017-03-10
The comparison has been completed and results are published in the KCDB.
Progress Report 2016-01-04
Progress report for Loop 1:
Draft A - Version 2 sent to the participants in July 2015.
Draft A - Version 3 sent to the participants in November 2015.
Draft B sent to the participants in January 2016.
Draft B sent to TC-M/SC-P for approval in January 2016.
Progress Report 2015-05-13
Progress report for Loop 1:
Measurements completed in October 2012, all the data sent from laboratories to MIKES in January 2013, Draft A ver1 sent to participants in May 2013, last comments for Draft A ver1 in March 2015. Based on the comments and discussion in the EURAMET SC Pressure meeting in April 2015, the Draft A ver2 will be published during the spring 2015.
Progress Report 2013-04-17
Transfer standard Beamex MC5. Totally 14 laboratories participating to Loop1. All measurements completed. All the participants have reported their results to the pilot laboratory. Very first draft of the results was presented in the EURAMET TC-M, SC pressure meeting in March 2013. Results analysis is ongoing.