Fluid detection device
AssigneeWhatman Scientific Limited
InventorsStephen J. Churchouse, David J. Fitchett, Louis Rey
Life of this patent
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Abstract
A device of the type which uses a moving boundary for detecting a fluid analyte. The device includes an impervious container (10, 12, 14) having a fluid entry aperture (20) and containing two contiguous layers. One of the layers is a detection layer (16) in the form of a sheet comprising a reagent to generate a signal by a reaction initiated by the analyte. The other layer (18) is a spreading layer permeable by the analyte position such that analyte entering the container spreads within the spreading layer. The device can be used, for example, as a gas monitor for indicating exposure to hazardous gases or vapours.
Claims11
A moving boundary gas detection device for detecting a gaseous analyte, which device comprises an impervious container having at least one fluid entry aperture and containing two contiguous layers said contiguous layers comprising:
- a detecting layer which is an anodic aluminum oxide sheet having pores extending transversely from one major face of the sheet to the other and comprising a reagent to generate a signal by a reaction initiated by a gaseous analyte,
- and a spreading layer permeable by the gaseous analyte positioned such that gaseous analyte entering the impervious container spreads within the spreading layer, wherein said spreading layer determines the movement of a moving boundary resulting from the reaction in said detection layer.
Dependencies are inferred from the claim text.