Gas-Detektoren-Array mit Probenspeicher fuer Chemieunfaelle und Braende Abschlussbericht

A Gas Detector Array (GDA) for hazardous compounds in air has been developed. The GDA is able to detect nearly all substances of the German ETW-List, comparable to the Emergency Response Planning Guidelines II. Due to the differences in properties and the large concentration range of the listed substances, the GDA consists of four different types of sensors. An ion mobility spectrometer (IMS) measures especially polar substances, for example ammonia, halogenated compounds and warfare agents. Aromatic compounds with an ionisation potential lower than 10,6 eV are detected with a photo ionisation detector. Combustible and explosive gases are measured by two semiconductor gas sensors and an electrochemical cell detects inorganic compounds, especially phosgene. The low dynamic range of the ion mobility spectrometer is increased with a dilution unit, that is installed in front of the gas inlet. In case of high concentrations the sample gas can be diluted by a factor of 10 or 100. The gas detector array offers a wide range of applications. The portable, battery powered system is easy to operate for example by fire fighters in emergencies. The signals of unknown substances are displayed in logarithmic scale and a library is used for identification. For monitoring the signals can be transmitted to an external computer. (orig.)SIGLEAvailable from TIB Hannover: F99B13+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Bildung, Wissenschaft, Forschung und Technologie, Bonn (Germany)DEGerman