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

Philipp Breitegger, Alexander Bergmann

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    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).
    Original languageEnglish
    Title of host publicationA Precise Gas Dilutor Based on Binary Weighted Critical Flows to Create NO2 Concentrations
    Pages1-4
    Volume2
    Edition13
    DOIs
    Publication statusPublished - 7 Dec 2018

    Publication series

    NameProceedings
    PublisherMDPI AG
    ISSN (Print)2504-3900

    Keywords

    • gas diluter
    • metrology
    • nitrogen dioxide

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