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Proceedings 2018, 2(13), 998;

A Precise Gas Dilutor Based on Binary Weighted Critical Flows to Create NO2 Concentrations

Institute of Electronic Sensor Systems, Graz University of Technology, 8010 Graz, Austria
Presented at the Eurosensors 2018 Conference, Graz, Austria, 9–12 September 2018.
Author to whom correspondence should be addressed.
Published: 7 December 2018
PDF [439 KB, uploaded 7 December 2018]


A gas diluter based on critical orifices was built and evaluated. The gas diluter is capable of creating dilution ratios of 1:1400 at a total flow of 6.5 L/min. An extended uncertainty analysis of gas concentrations and dilution ratios according to the Guide to the Expression of Uncertainty in Measurement was conducted. A gas cylinder of 5.16 ppm NO2 with a relative uncertainty of 1.5% (k = 1) can be diluted down to a concentration of 3.69 ppb NO2 (dilution ratio of 1:1400) at an uncertainty of 1.9% (k = 1). The results are in good agreement with reference NO2 measurements, conducted with a chemiluminescence detector (CLD, European reference method EN14211; 2005).
Keywords: gas diluter; nitrogen dioxide; metrology gas diluter; nitrogen dioxide; metrology
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Breitegger, P.; Bergmann, A. A Precise Gas Dilutor Based on Binary Weighted Critical Flows to Create NO2 Concentrations. Proceedings 2018, 2, 998.

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