| 摘要 |
<p>A gas sensor (1) has a reagent (5) of orange colour and which becomes darker in colour upon contact with CO. The reagent (5) is partially covered by a mask (6) which retards diffusion of contaminants to the reagent surface behind the mask. Thus, for example, if the exposed part becomes bleached by contaminants, CO will still be indicated as a dark line at the edge of the mask (6). <IMAGE></p> |
