Extending the functionality of the METAS primary standard in gas flow

M. A. de Huu, M. Tschannen, Hugo Bissig

Abstract

METAS is the Swiss national metrology institute. Its laboratory for flow operates several primary standards for liquid and gas flow, among which two piston provers with BIPM-registered CMC entries in the range (0.1 to 300) L/min. To extend their functionality, additional working modes have been implemented in the data-acquisition software that allow almost endless measurement possibilities over the flow range (0.002 to 300) L/min. With the current extension of functionalities, all types of flow meters, from critical nozzles to laminar flow elements can now be calibrated under various configurations.In this paper, we will present the changes that have been made to the design, as well as commissioning and validation results with various types of flow meters. The increase in flow rate range towards very low values brings pressure and temperature stability consideration into account that are being treated and presented here. Finally, results from a METAS internal bilateral comparison are presented and show an excellent agreement between two primary standards.

Keywords

Gas flow primary standard; Piston prover; Low uncertainty

Download

IMEKO-TC9-2019-073.pdf

DOI

10.21014/tc9-2022.073

IMEKO TC

TC9 - Flow Measurement

Back to the proceedings