Laminated wafer for sensing and monitoring exposure to gases

Details Laminated wafer for sensing and monitoring exposure to gases Laminated wafer for sensing and monitoring exposure to gases

1986-05-19

1988-09-20

Castel, Benoit

Chemistry: analytical and immunological testing

Optical result

With claimed manipulation of container to effect reaction or...

436177, 436178, 422 57, 422 58, 422 87, 422 56, G01N 2103, C01G 3700

Patent

active

047725605

ABSTRACT:
The present invention provides a disposable laminated colorimetric gas monitoring wafer for sensing and monitoring exposure to a selected gas. Opposed gas impermeable layers, such as plastic, generally enclose a carrier medium, such as a sorbent, which carries a color-forming chromophore composition that changes color in response to exposure to a selected gas. A porous, hydrophobic membrane exposed through an opening in one outer plastic layer, overlays the carrying medium and the chromophore composition. Wind and moisture effects are reduced by the porous membrane, and the porous hydrophobic membrane also prevents relative humidity from effecting the color of the chromophore composition.

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