| 摘要 |
<p>A flameproof barrier for use in a gas sensor or gas detector, the flameproof barrier comprising: a porous element 16 through which gas passes, wherein the porous element is coated with a protective layer, the material of the layer chosen so as to promote gas transport through the porous element of the flameproof barrier and to limit corrosion and to remain unblocked from environmental contaminants. The protective layer is preferably hydrophobic and may be applied to the porous element as a plasma coating or using electrolytic deposition metal organic chemical deposition (MOCVD) or chemical vapour deposition (CVD) methods.</p> |
