A novel, inexpensive sensor (10) for detecting volatile hydrocarbons and other solvent vapors detects leaks in the fittings and valves of petroleum refineries and chemical manufacturing and processing plants. The sensor comprises (a) a dielectric substrate (12) having a major surface; (b) a pair of interdigitated,...http://www.google.de/patents/US5417100?utm_source=gb-gplus-sharePatent US5417100 - Reversible sensor for detecting solvent vapors
