| 摘要 |
<p>A detector for monitoring low molecular weight compounds and especially the alcohols ethanol and methanol in environments where higher molecular weight contaminants may also be present. Samples of gas are passed through a porous adsorber which has relatively low retention for low molecular weight compounds such as methanol and ethanol and relatively high retention for higher molecular weight species. The portion of the sample not retained by the adsorber is then passed through a reagent which undergoes a colour change with low molecular weight compounds the extent of colour change being indicative of the amount of low molecular weight compound present. The invention is particularly useful for monitoring the concentration of low molecular weight organic alcohols such as methanol and ethanol.</p> |
