A gas sensor assembly is provided with a non-conductive housing portion and a plurality of conductive housing portions, each of which are conductively separated from each other, and the conductive housing portions are composed of a conductive plastic material. A gas-sensing agent is disposed in a receptacle...http://www.google.co.uk/patents/US6305214?utm_source=gb-gplus-sharePatent US6305214 - Gas sensor and methods of forming a gas sensor assembly
