Nitrogen dioxide sensing element and method of sensing the presence of nitrogen dioxide

摘要

An element for sensing the presence of nitrogen dioxide gas in the environment. The element comprises a film of a pyrolyzed polyaromatic polymer having semi-conductive properties which is mounted on an electrically non-conductive base. Electrical leads are attached at spaced locations to the film and are connected in an electrical circuit with a signalling or control mechanism. The presence of nitrogen dioxide gas will cause a change in the electrical characteristics of the film to thereby activate the mechanism. A heating element can be associated with the base to insure constant temperature and humidity conditions.