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Improved flow rate monitoring of the NPL high dew-point generator.

Stevens, M (1998) Improved flow rate monitoring of the NPL high dew-point generator. NPL Report. CMAM 13

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The High Dew-point Generator operated by the National Physical Laboratory requires many parameters to be carefully monitored to enable a calibration service for hygrometers to be offered with an acceptable uncertainty. One such parameter is the recirculation flow rate through the generator. Until now this has been measured using a hot wire anemometer. The limiting factor of this instrument is that it will not operate above 60 °C but the generator itself works up to 82 °C. For this reason it is desirable to obtain an alternative measuring instrument that will operate over the full range of the generator. This report considers the measuring devices available, identifies an appropriate instrument and reports the results of the flow measurements at different temperatures. This project has been initiated as part of the DTl's National Measurement System Programme for Mass, 1996 to 1999, project 4, Humidity Standards.

Item Type: Report/Guide (NPL Report)
NPL Report No.: CMAM 13
Subjects: Engineering Measurements
Engineering Measurements > Thermal
Last Modified: 10 Sep 2018 14:05
URI: http://eprintspublications.npl.co.uk/id/eprint/999

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