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Proceeding Paper

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
*
Author to whom correspondence should be addressed.
Presented at the Eurosensors 2018 Conference, Graz, Austria, 9–12 September 2018.
Proceedings 2018, 2(13), 998; https://doi.org/10.3390/proceedings2130998
Published: 7 December 2018
(This article belongs to the Proceedings of EUROSENSORS 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
MDPI and ACS Style

Breitegger, P.; Bergmann, A. A Precise Gas Dilutor Based on Binary Weighted Critical Flows to Create NO2 Concentrations. Proceedings 2018, 2, 998. https://doi.org/10.3390/proceedings2130998

AMA Style

Breitegger P, Bergmann A. A Precise Gas Dilutor Based on Binary Weighted Critical Flows to Create NO2 Concentrations. Proceedings. 2018; 2(13):998. https://doi.org/10.3390/proceedings2130998

Chicago/Turabian Style

Breitegger, Philipp, and Alexander Bergmann. 2018. "A Precise Gas Dilutor Based on Binary Weighted Critical Flows to Create NO2 Concentrations" Proceedings 2, no. 13: 998. https://doi.org/10.3390/proceedings2130998

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