FIELD: determination of content of oxygen in exhaust gases of internal combustion engines. SUBSTANCE: sensor has sensitive element anchored in metal case and sealing collar which rests against sealing surface formed on discharge pipeline of system releasing exhaust gases. Sealing collar has two ring elements formed on case and protruding beyond it. Each element includes inclined sealing surface. Space is formed between both ring elements. EFFECT: avoidance of depressurization of case emerging with reduction of material of case. 4 cl, 2 dwg
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