Intercomparison of low pressure gas flow facilities using a Molbloc transfer package

KCDB: EUROMET.FF.M.S3
Proposal, 12 Oct 2004

During the recent review process of the flow field CMC tables submitted to BIPM, it became apparent that there is an urgent need of supporting evidence for a significant number of claimed measuring capabilities in the field of low (or very low) pressure gas flow measurement. At the same time the lack of any previous extended interlaboratory comparison of existing low pressure gas flow facilities was recognized. Towards these directions a new project is proposed with the following objectives and technical specifications.

Objectives:

To compare low pressure gas flow facilities of EUROMET member institutes using a Molbloc transfer package.
To provide the member laboratories with the supporting evidence for their claimed measuring capabilities in the field of low pressure gas flow based on the results of the intercomparison.

Technical Specifications:

Transfer standard: A transfer package consisting of 2 Molbloc flow meters and 2 mass flow controllers (MFC) with associated pressure regulators, Molbox 1 control and measuring unit and MFC switch box unit.
Test flow rates: 0.1, 0.5, 1, 3, 10 and 25 L/min
Test gases: a) Nitrogen of purity 99.998% (1st TS circulation)
b) Air from Laboratory

Subjects
Flow (F)
Coordinator
Richard Paton, NEL (United Kingdom)
Coordinating Institute
NEL (United Kingdom)