Patents Assigned to Association pour la Recherche et la Developpement des Methodes et Processus Industriels (Armines)
  • Patent number: 4485667
    Abstract: An enclosure (17) contains two ovens (18, 19) each containing a semiconductor metal oxide (SnO.sub.2 or NiO) sensor (13) previously activated using H.sub.2 S or SO.sub.2. The sensors (13) are heated to different temperatures the lower of which corresponds to a peak on the sensor conductivity curve characteristic of the gas. The signals produced are applied to a comparator (30). For many toxic gases this peak occurs at concentrations below their toxicity threshold in air.
    Type: Grant
    Filed: September 29, 1982
    Date of Patent: December 4, 1984
    Assignee: Association pour la Recherche et la Developpement des Methodes et Processus Industriels (Armines)
    Inventors: Rene Lalauze, Christophe Pijolat, Jean-Paul Couput