Gas analyzer
    1.
    发明授权

    公开(公告)号:US3586486A

    公开(公告)日:1971-06-22

    申请号:US3586486D

    申请日:1968-02-23

    申请人: BOSCH ARMA CORP

    CPC分类号: G01N27/16

    摘要: A CATALYTIC COMBUSTION TYPE GAS ANALYZER WHICH MIXES GAS AND AIR IN A SELECTED RATIO. THE MIXTURE IS PASSED OVER A PAIR OF ELECTRICALLY HEATED RESISTANCE, ELEMENTS, ONLY ONE OF WHICH IS CATALYTICALLY ACTIVE, CONNECTED IN A WHEATSTONE BRIDGE MEASURING CIRCUIT. ANY COMBUSTILE GAS IN THE SAMPLE IS OXIDIZED AT THE CATALYTIC SURFACE OF THE ACTIVE ELEMENT, PRODUCING AN ELEMENT TEMPERATURE RISE PROPORTIONAL TO THE PERCENTAGE OF COMBUSTIBLE GAS, THEREBY UNBALANCING THE WHEATSTONE BRIDGE. THE ELEMENTS UTILIZE A CERAMICALLY COATED ELECTRICAL CONDUCTOR, OVER WHICH A GLASS SEAL IS FORMED. AN ALUMINUM OR BERYLLIUM OXIDE COATING COVERS THE GLASS SEAL. THE CATALYTICALLY ACTIVE ELEMENT HAS A CATALYTIC COATING OVER THE OCIDE COATING.