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Development of high-line differential pressure standards.

Hay, M*; Simpson, D (1999) Development of high-line differential pressure standards. NPL Report. CMAM 41

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Abstract

There has been concern that potential discrepancies exist between different standards used for generating differential pressure at high line pressures. This report details a comparative study, both theoretical and experimental, of three devices: gas-lubricated 'twin-post' pressure balances, oil-lubricated gas-operated 'twin-post' pressure balances and pressure 'dividers'. It shows that agreement between the instruments can be reached when adequate consideration is given to constructing detailed mathematical models associated with instrument performance and the corresponding measurement uncertainty budgets. However, significant measurement discrepancies between the various methods can occur when over-simplistic models are used to describe their characteristics, or over-optimistic estimates of uncertainty are made. Furthermore, and for the same reason, discrepancies are just as likely between devices of similar design.

Item Type: Report/Guide (NPL Report)
NPL Report No.: CMAM 41
Subjects: Engineering Measurements
Engineering Measurements > Mass, Force, Pressure
Last Modified: 02 Feb 2018 13:18
URI: http://eprintspublications.npl.co.uk/id/eprint/1278

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