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    • 4. 发明专利
    • OXYGEN CONCENTRATION DETECTOR
    • CA1085458A
    • 1980-09-09
    • CA299977
    • 1978-03-29
    • NIPPON DENSO CO
    • AKIYAMA YOSHINORIOUKI MASAMISUZUKI MASATOSI
    • G01N27/26
    • OXYGEN CONCENTRATION DETECTOR An oxygen concentration detector comprises an oxygen concentration sensor which produces an electromotive force in accordance with a difference between an oxygen concentration in a gas component of a gas under test and an oxygen concentration in a reference gas, first and second electrodes formed on the side of the gas under test and on the side of the reference gas of the oxygen concentration sensor so that the electromotive force of the oxygen concentration sensor is taken across the electrodes, a first protective member arranged to cover the first electrode and having a number of pores through which the gas under test can pass and a second protective member arranged between the first electrode and the first protective member and having a number of pores through which the gas under test can pass. A gap is formed between both the protective members and the pores of the first protective member are staggered in relation to the pores of the second protective member.