Airborne contaminant indicator

G - Physics – 01 – N

Patent

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G01N 31/22 (2006.01) B01D 53/04 (2006.01)

Patent

CA 2294253

An indicator system (18) provides a visual indication of the cumulative level of an airborne contaminant. An indicator has a transparent sheath (20) with support medium treated with an acid and a pH indicator (22), as the contaminant is adsorbed, the color changes along the medium (24). The indicator system may be used with an adsorptive filter system to predict the life of adsorption bed assemblies. In one embodiment, a sample flow is taken upstream of the adsorption beds and is calibrated with a flow meter and valve. By monitoring the indicator, an accurate prediction of adsorption bed life may be made.

L'invention concerne un système indicateur (18), fournissant une indication visuelle du niveau cumulé d'un contaminant de l'air. Cet indicateur présente une gaine transparente (20) avec un support traité à l'acide, et un indicateur de pH (22). Lorsque le contaminant est absorbé, la couleur change le long de ce support (24). Ce système indicateur peut être utilisé avec un système à filtre absorbant, afin de prévoir la durée de vie d'ensembles lits d'absorption. On prélève un courant d'échantillonnage en amont de ces lits d'absorption, puis on le mesure au moyen d'un débitmètre et d'une soupape. En contrôlant cet indicateur, on peut prévoir précisément la durée de vie d'un lit d'absorption.

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