Provision of traceability for absolute humidity


The Standard Humidity Generators held at IMGC and at NPL are recognised as independent national primary standards of humidity dew-point traceable to the International Temperature Scale 1990 as realised in each country.

This Project recognises that the Primary Gravimetric Hygrometer held at NPL shall be the common standard of both Italy and the UK for absolute humidity. It provides for comparison of the Standard Humidity Generators in both countries with the Primary Gravimetric Hygrometer by appropriate means and their subsequent recognition as secondary standards for absolute humidity. It describes also the provision of calibration services and technology transfer related to humidity measurement.

Further Information

The parties to this agreement are ready to consider its extension to include other EUROMET partners. UK (NPL) is ready to consider similar bi-lateral agreements with other individual EUROMET partners.

Thermometry (T)
Coordinating Institute
NPL (United Kingdom)
Participating Partners
INRIM (Italy)