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Comparison of instruments for measuring relative humidity.

Stevens, M; Collier, T; Harris, R* (2000) Comparison of instruments for measuring relative humidity. NPL Report. CBTLM 6

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Abstract

The measurement of relative humidity (rh) has implications throughout industry. Traditional methods for accurately determining rh have been to the use wet- and dry-bulb psychrometers or to make a dew point measurement with a separate temperature measurement and covert into rho The development of electronic devices for measuring rh has now achieved a position where the uncertainties compare favourably with other methods. With the recent commissioning of a relative humidity generation facility as part of the UK's Humidity calibration facility, a direct source of traceability for relative humidity measurements is now available, and the claims made for these devices can be examined. The aim of this work is to identify and examine commercially-available instruments for measuring relative humidity to determine which, if any, of these is suitable for use as a transfer standard of the very best accuracy. This project has been carried out as part of the DTI's National Measurement System Thermal Programme, 1998 to 2001, Project 4.2, Future Humidity Standards.

Item Type: Report/Guide (NPL Report)
NPL Report No.: CBTLM 6
Subjects: Engineering Measurements
Engineering Measurements > Thermal
Last Modified: 02 Feb 2018 13:17
URI: http://eprintspublications.npl.co.uk/id/eprint/1841

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