| abstract |
PCT No. PCT/GB91/00179 Sec. 371 Date Sep. 18, 1992 Sec. 102(e) Date Sep. 18, 1992 PCT Filed Feb. 6, 1991 PCT Pub. No. WO91/12527 PCT Pub. Date Aug. 22, 1991.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. |