A Trial Intercomparison of Humidity Generators at Extremes of Range Using Relative Humidity Transmitters |
| |
Authors: | M Stevens R Benyon S A Bell T Vicente |
| |
Affiliation: | (1) National Physical Laboratory, Teddington, TW11 0LW, UK;(2) Instituto Nacional de Técnica Aeroespacial, Torrejon de Ardoz, Spain |
| |
Abstract: | In order to effectively implement the Mutual Recognition Arrangement (MRA) of the International Committee for Weights and
Measures (CIPM), national metrology institutes (NMIs) are required to support their claims of calibration and measurement
capability (CMC) with a quality system compliant with ISO/IEC 17025, and with suitable evidence of participation in key or
supplementary comparisons. The CMC review process, both at regional and inter-regional levels, uses criteria that combine
the provisions mentioned above, together with additional evidence demonstrating scientific and technical competence of the
institutes. For dew-point temperatures, there are key comparisons in progress under the Consultative Committee for Thermometry
(CCT) and under the European regional metrology organisation (EUROMET), together with information available on past regional
supplementary comparisons. However, for relative humidity there are, to date, no such comparisons available to support CMC
entries. This paper presents and discusses the results of a preliminary investigation of the use of relative humidity and
temperature transmitters in order to determine their suitability for the intercomparison of standard humidity generators in
support of CMC claims for the calibration of relative humidity instruments. The results of a recent bilateral comparison between
2 NMIs at the extremes of the range up to 98%rh at 70 °C, and down to 1%rh at −40 °C are reported. Specific precautions and
recommendations on the use of the devices as transfer standards are presented. |
| |
Keywords: | Measurement comparison Relative humidity Transmitter |
本文献已被 SpringerLink 等数据库收录! |
|