A Precise Gas Dilutor Based on Binary Weighted Critical Flows to Create <em>NO</em><sub>2</sub> Concentrations
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 Measu...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2018-12-01
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| Series: | Proceedings |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2504-3900/2/13/998 |
| Summary: | 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 <i>NO</i><sub>2</sub> with a relative uncertainty of 1.5% (k = 1) can be diluted down to a concentration of 3.69 ppb <i>NO</i><sub>2</sub> (dilution ratio of 1:1400) at an uncertainty of 1.9% (k = 1). The results are in good agreement with reference <i>NO</i><sub>2</sub> measurements, conducted with a chemiluminescence detector (CLD, European reference method EN14211; 2005). |
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| ISSN: | 2504-3900 |