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Study of alternative fluids for use in the humidity generator at NPL.

Stevens, M (1998) Study of alternative fluids for use in the humidity generator at NPL. NPL Report. CMAM 14

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TIle Standard Humidity Generator operated by the National Physical Laboratory requires careful temperature control over a range of temperatures down to -75 °C. Until now this has been achieved using well stirred temperature controlled fluid baths. The fluid used for sub-zero operation is trichloroethylene which is toxic, environmentally unfriendly and whose production may be phased out in the near future. Alternative fluids have been considered and the best method of their use is examined. This report concludes that the most viable option is to design and construct a low-temperature humidity generator which will operate using a sealed temperature controlled bath containing alcohol. The progress to achieve this is briefly detailed. This project has been initiated as part of the Dll's National Measurement System Programme for Mass, 1996 to 1999, project 4, Humidity Standards.

Item Type: Report/Guide (NPL Report)
NPL Report No.: CMAM 14
Subjects: Engineering Measurements
Engineering Measurements > Thermal
Last Modified: 10 Sep 2018 14:05
URI: http://eprintspublications.npl.co.uk/id/eprint/977

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