Influence of Moisture and Interfering Gases on Measurement Accuracy of Portable Fourier Transform Infrared Gas Analyzer

Susu PAN, Su GUO, Haixin LAI, Liang WANG, Junqi HUANG, Jian XU, Yongzhi ZHOU

Acta Metrologica Sinica ›› 2025, Vol. 46 ›› Issue (12) : 1814-1819.

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Acta Metrologica Sinica ›› 2025, Vol. 46 ›› Issue (12) : 1814-1819. DOI: 10.3969/j.issn.1000-1158.2025.12.15

Influence of Moisture and Interfering Gases on Measurement Accuracy of Portable Fourier Transform Infrared Gas Analyzer

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Abstract

Due to its capability of multi-component simultaneous detection, portable fourier transform infrared (FTIR) gas analyzers are widely used in environmental monitoring. However, in practical applications, the presence of moisture and interfering gases significantly affects the measurement accuracy. This study investigates the impact of moisture and interfering gases on the accuracy of portable FTIR gas analyzers by simulating real-world conditions at stationary pollution source emission points, under varying humidity levels (0% to 20% inclusive) and typical interfering gases (e.g., CO2, NO, CH4, NH3). The experimental results show that moisture can introduce an interference relative error of up to -5.88% for low-concentration SO2 measurements, while the accuracy of NH₃ measurements is also affected with relative error of about 3%. Cross-interference from other gases contributes to errors ranging from -0.1% to 2.7% inclusive. To improve measurement accuracy, instrument calibration for the moisture and interfering gas composition of different emission sources is recommended.

Key words

stoichiometry / Fourier transform infrared gas analyzer / accuracy of measurement result / water interference / gas interference

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PAN Susu , GUO Su , LAI Haixin , et al . Influence of Moisture and Interfering Gases on Measurement Accuracy of Portable Fourier Transform Infrared Gas Analyzer[J]. Acta Metrologica Sinica. 2025, 46(12): 1814-1819 https://doi.org/10.3969/j.issn.1000-1158.2025.12.15

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