An Orsat gas analyser or Orsat apparatus is a piece of laboratory equipment used to analyse a gas sample (typically fossil fuel flue gas) for its oxygen, carbon monoxide and carbon dioxide content. Although largely replaced by instrumental techniques, the Orsat remains a reliable method of measurement and is relatively simple to use.[1]
The apparatus was invented by Louis Orsat who reported it in the Annales des Mines in 1875.[2][3] There was an earlier report by Thomas Egleston in 1873.[4]
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