Final report to the CCT on key comparison CCT-K8 - comparison of local realisations of dew-point temperature of humid gas in the range 30 °C to 95 °C

García Gallegos, Jaime; Mitter, Helmut; Abe, Hisashi; Benyon Puig, Robert; Carroll, P.; Choi, B. I.; Deschermeier, Regina; Ebert, V.; Fernicola, Vito; Wang, L.; Meyer, C.; Smorgon, Denis; Vicente Mussons, Tomás

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Final report to the CCT on key comparison CCT-K8 - comparison of local realisations of dew-point temperature of humid gas in the range 30 °C to 95 °C

dc.contributor.author	García Gallegos, Jaime
dc.contributor.author	Mitter, Helmut
dc.contributor.author	Abe, Hisashi
dc.contributor.author	Benyon Puig, Robert
dc.contributor.author	Carroll, P.
dc.contributor.author	Choi, B. I.
dc.contributor.author	Deschermeier, Regina
dc.contributor.author	Ebert, V.
dc.contributor.author	Fernicola, Vito
dc.contributor.author	Wang, L.
dc.contributor.author	Meyer, C.
dc.contributor.author	Smorgon, Denis
dc.contributor.author	Vicente Mussons, Tomás
dc.date.accessioned	2026-01-09T06:34:10Z
dc.date.available	2026-01-09T06:34:10Z
dc.date.issued	2025-02-04
dc.description	The final report has been peer-reviewed and approved for publication by the CCT, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA). 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 https://www.bipm.org/kcdb/.
dc.description.abstract	The report summarises the results of the CCT-K8 key comparison in the field of humidity. The main target of this comparison was to obtain the degree of equivalence (DoE) between realizations of local scales of dew point temperature of humid gas (air), in the range from 30 °C to 95 °C, among the participating national metrology institutes. The report gives details of the scheme, procedure and analysis of the comparison. The overall results display a very good agreement of the nine participating laboratories. The results show excellent agreement between the realized scales with no detected outliers. The performance of the travelling standards was excellent and can be attributed to the intensive preconditioning and selection of the platinum resistance thermometers, prior to their integration into the measuring head assembly, that led to insignificant drift. In the conclusion, some lessons learned are reported that could be beneficial for future key comparisons.
dc.description.peerreviewed	Peerreview
dc.description.sponsorship	This comparison would not have been possible without the generous collaboration of MBW Calibration of Switzerland, and in particular, of Mr. Daniel Mutter. Support was provided in record time, even on site. He arranged for up to three batches of PRTs to be supplied, specially assembled for calibration and then finally integrating the selected probes in the measurement heads and provided information and technical assistance during measurements at the most inconvenient hours. Equally important has been the support of Dr. Helmut Mitter, of BEV/E+E whose excellent knowledge of statistics enabled the different analysis scenarios to be performed, establishing the DoE and KCRV, with robust statistical methods. We also wish to thank Dr. Volker Ebert for hosting at PTB our colleague Dr. Jaime Garcia Gallegos during his period as a research student at INTA, and Dr. Regina Deschermeier who liaised in the analysis of the EURAMET.T-K8, providing useful knowledge [Des23]for the analysis of this comparison. Special thanks to Sarah Beardmore from the NPL for her invaluable assistance in conducting the measurements for the aforementioned laboratory.
dc.identifier.citation	Metrologia 62: 03001
dc.identifier.doi	10.1088/0026-1394/62/1A/03001
dc.identifier.issn	0026-1394
dc.identifier.other	https://iopscience.iop.org/article/10.1088/0026-1394/62/1A/03001
dc.identifier.uri	https://hdl.handle.net/20.500.12666/1612
dc.language.iso	eng
dc.publisher	IOP Science
dc.relation.isreferencedby	H. Abe et al (2021). Final report on APMP comparison in humidity APMP.T−K8: Dew point temperature +30 °C to +95 °C. Metrologia 58. Tech. Suppl., 03002. S. Bell et al. (2015). Final report on CCT-K6: Comparison of local realisations of dew point temperature scales in the range −50 °C to +20, Draft. Metrologia. 52. Tech. Suppl., 03005. R. Benyon, N. Böse, H. Mitter, D. Mutter, T. Vicente. (2012). An investigation of the relation between contact thermometry and dew-point temperature realization. Int. Journal of Thermophysics. 33, issue 8-9, pp 1741-1757. R. Benyon, T. Vicente, P. Hernández, L. De Rivas, F. Conde. (2012). An Evaluation of the Long-Term Stability and Temperature Coefficient of Dew-Point Hygrometers. Int. Journal of Thermophysics. 33, issue 8-9, pp 1758-1770. O. Bodnar. (2014). On the adjustment of inconsistent data using the Birge ratio. Metrologia51 (2014) 516-521. R. Benyon & H. Mitter, Int. J. Thermophys. (2008) 29:1623–1631. Review Protocol for Humidity CMC’s. https://www.bipm.org/en/committees/cc/cct/publications (Last accessed 20/05/2024). M. Cox. (2002). The evaluation of key comparison data. Metrologia. 39, p. 589-595. CIPM MRA-D-05. (March 2016). Measurement comparisons in the CIPM MRA. CIPM MRA-G-11 − Measurement comparisons in the CIPM MRA. R. Deschermeier. (2023). EURAMET.T-K8 (EURAMET Project No. P 717) Draft B. L. Greenspan. (1976). Functional Equations for the Enhancement Factorsfor CO2 -Free Moist Air. Journal of research of the National Bureau of Standards – A. Physics and Chemistry. Vol. 80A, 1, p. 41. B. Hardy. (1998). ITS-90 formulations for vapour pressure, frostpoint temperature, dewpoint temperature and enhancement factors in the range −100°C to 100°C. Third International Symposium on Humidity and Moisture, Papers and Abstracts of the Conference, National Physical Laboratory, UK). ISBN 0 946754 241 p. 214–221. C.W. Meyer, T. Herman, and W.W. Miller, “Calibration of Hygrometers with the Hybrid Humidity Generator”, NIST SP 250-83r1, DOI:10.6028/NIST.SP.250-83r1. H. Mitter. (2006). The BEV/E+E Elektronik standard humidity generator in Proceedings of the 5th International Symposium on Humidity and Moisture ISHM 2006 (INMETRO, Brazil, 2006), ISBN 978-85-86920-04-2. Private conversations between INTA and H. Mitter as an expert in the calculation of uncertainty budget and excellence values in intercomparison processes. T.J. Quinn. (1999). Guidelines for key comparisons carried out by Consultative Committees. Appendix F to the MRA, BIPM, Paris. D. Sonntag. (1990). Important new values of the physical constants of 1986, vapour pressure formulations based on the ITS-90, and psychrometer formulae. Z Meteorol 70: 340–344. Technical protocol CCT-K8. (2016). Comparison of realizations of local scales of dew point temperature of humid gas. Dew-point Temperature +30 °C to +95 °C. Submitted on 26/11/2016.
dc.rights	Attribution-NonCommercial-ShareAlike 4.0 International	en
dc.rights.accessRights	info:eu-repo/semantics/openAccess
dc.rights.license	CIPM Mutual Recognition Arrangement (CIPM MRA)
dc.rights.uri	http://creativecommons.org/licenses/by-nc-sa/4.0/
dc.title	Final report to the CCT on key comparison CCT-K8 - comparison of local realisations of dew-point temperature of humid gas in the range 30 °C to 95 °C
dc.type	info:eu-repo/semantics/article
dc.type.coar	http://purl.org/coar/resource_type/c_2df8fbb1
dc.type.hasVersion	info:eu-repo/semantics/publishedVersion
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