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J. Gieshoff; K. LedjeffHey


The Fraunhofer-Institute for Solar Energy Systems has been working in the field of hydrogen technology for nearly ten years. The safe and reliable operation of hydrogen appliances is a very important task and has to be monitored continuously. In the framework of a project a small safety device for hydrogen appliances has been developed. The hydrogen sensitive switch bases on the catalytic conversion of hydrogen resulting in a temperature increase due to the heat release on the catalytic surface. The temperature of the catalyst is compared with a non-catalytic surface. A positive temperature difference indicates the presence of hydrogen in the atmosphere and leads to an alarm signal. Due to the overall design the switch can operate even in ignitable hydrogen/air-mixtures without any risk. As second property the electrical energy demand is very low compared with state of the art sensors.


Times Cited: 0 Veziroglu, TN Winter, CJ Baselt, JP Kreysa, G 11th World Hydrogen Energy Conference (11 WHEC) Jun 23-28, 1996 Stuttgart, germany Deut Gesell Chem Apparatewesen Chem Tech & Biotechnol e V; Int Assoc Hydrogen Energy; State Govt Baden Wurttemberg; Lord Mayor City Stuttgart; BASF AG, Ludwigshafen; Bayer Motorenwerke AG, Munchen; Bayernwerk AG, Munchen; Daimler Benz AG, Stuttgart; Deut Lufthansa AG, Frankfurt am Main; Hamburg Elekt Werke AG, Hamburg; Hoechst AG, Frankfurt am Main; Huls AG, Marl; Landesgirokasse LG Stift, Stuttgart; Linde AG, Hollriegelskreuth; Messer Griesheim GmbH, Krefeld; PreussenElektra, Hannover; Robert Bosch GmbH, Stuttgart; US DOE; Tech Werke Stadt Stuttgart AG; Deut Forschungsanstalt Luftfahrt & Raumfahrt e V; Deut Phys Gesell, Arbeitskreis Energie; Energietech Gesell VDE; European Federat Chem Engn; Forum Zukunftsenergien e V; VDI, Gesell Energietech; Zentrum SonnenenergieForschung & WasserstoffForschung 0