Performance of single point monitors for measuring aerial ammonia and hydrogen sulfide

Yi Liang, Hongwei Xin, Steven J. Hoff, Thomas Lehman Richard

Research output: Contribution to conferencePaper

Abstract

Performance of 43-44 Single Point Monitors (SPMs) was evaluated for measuring aerial ammonia (NH 3, 0-30 ppm) and hydrogen sulfide (H 2S, 0-90 ppb) under laboratory and field conditions. Calibration gas or sample air with various levels of moisture content or dew-point temperature (t dp) and gas concentrations were introduced simultaneously to the SPMs and a reference gas analyzer - chemiluminescence analyzer for NH 3 and pulsed-fluorescence analyzer for H 2S. Linear relationships were observed between readings of the SPMs and those of the respective reference analyzer, which were influenced by moisture content or t dp of the calibration or sample air. Specifically, average H 2S readings by the SPMs were, respectively, 66%, 80%, 87% and 97% of those by the reference analyzer for calibration gas at t dp of -22 (dry), 9, 13 and 16°C. In comparison, average NH 3 readings by the SPMs were 42%, 86%, 102% and 178% of those by the reference analyzer for calibration gas at t dp of -22, 8.5-10, 12.5-14, and 16-17°C respectively. Coefficient of variation of "as-is" readings among the tested SPMs was up to 15% for H 2S and up to 25% for NH 3. Regression equations were developed to compensate for the moisture effect on SPM readings of both gases. The correctional regression equations were able to achieve over 90% of the reference H 2S readings; however, such equations were not as effective in predicting or correcting NH 3 readings by the SPMs.

Original languageEnglish (US)
Pages5343-5356
Number of pages14
StatePublished - Dec 1 2004
EventASAE Annual International Meeting 2004 - Ottawa, ON, Canada
Duration: Aug 1 2004Aug 4 2004

Other

OtherASAE Annual International Meeting 2004
CountryCanada
CityOttawa, ON
Period8/1/048/4/04

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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  • Cite this

    Liang, Y., Xin, H., Hoff, S. J., & Richard, T. L. (2004). Performance of single point monitors for measuring aerial ammonia and hydrogen sulfide. 5343-5356. Paper presented at ASAE Annual International Meeting 2004, Ottawa, ON, Canada.