This report presents the results of a comparison in the context of an international collaboration that gives confidence in the relative humidity measurements carried out by several Latin-American institutes within the Mutual Recognition Arrangement (MRA) of the International Committee on Weights and Measures (CIPM). This interlaboratory comparison of humidity standards, the first one in Latin-America and one of the few of this type in the world, was organized in two rounds and carried out by the following National Metrology Institutes: INMETRO (Brazil), IBMETRO (Bolivia), INEN (Ecuador), INM (Colombia), CENAMEP AIP (Panama), ENAER (Chile), INTI (Argentina), LATU (Uruguay) and INTN (Paraguay). The interlaboratory comparison was performed in the scope of relative humidity in the range from 30 %rh to 90 %rh at temperatures of 20 C and 40 C. In this comparison, INMETRO was the reference laboratory, and acted as coordinator together with IBMETRO. Two thermohygrometers with capacitive humidity sensors were used as transfer standards, which were calibrated three times by the reference laboratory during the course of the interlaboratory comparison. A technical protocol prepared by INMETRO and IBMETRO circulated among the participants for comments. To sum up, the participants used their own calibration procedures for calibrating the transfer standards together with some instructions given in the technical protocol. Besides, the participants had to submit with the measurement results the respective uncertainties estimated according to their internal procedures and the Guide to the Expression of Uncertainty in Measurement (GUM). The performance of each participating laboratory was evaluated by comparing its measurements results with those of the reference laboratory by means of the normalized error, according to ISO/IEC 17043:2010, and by the degree of equivalence.

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/.

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).

本报告介绍了在国际合作背景下的比较结果，该结果使人们对国际度量衡委员会 (CIPM) 的相互承认安排 (MRA) 内的几个拉丁美洲机构进行的相对湿度测量充满信心. 这种湿度标准的实验室间比较是拉丁美洲的第一个，也是世界上为数不多的此类标准之一，分两轮组织，由以下国家计量机构进行：INMETRO（巴西）、IBMETRO（玻利维亚） 、INEN（厄瓜多尔）、INM（哥伦比亚）、CENAMEP AIP（巴拿马）、ENAER（智利）、INTI（阿根廷）、LATU（乌拉圭）和 INTN（巴拉圭）。实验室间比较是在 30 %rh 至 90 %rh 的相对湿度范围内进行的，温度为 20°C 和 40°C。在这次比较中，INMETRO 是参考实验室，并与 IBMETRO 一起担任协调员。两个带有电容式湿度传感器的温湿度计用作传输标准，在实验室间比较过程中由参考实验室校准了 3 次。由 INMETRO 和 IBMETRO 编写的技术协议在参与者中分发以征求意见。总而言之，参与者使用他们自己的校准程序来校准传输标准以及技术协议中给出的一些说明。此外，参与者必须连同测量结果一起提交根据其内部程序和测量不确定度表达指南（GUM）估计的各自不确定度。

要访问本文的正文，请单击最终报告。请注意，此文本出现在 BIPM 密钥比较数据库 https://www.bipm.org/kcdb/ 的附录 B 中。

根据 CIPM 互认安排 (CIPM MRA) 的规定，最终报告已通过同行评审并由 CCT 批准发布。